STIRENE BUTADIENE RUBBERS (SBR 1502)

Beyond automotive tire sidewalls, inner liner compounds, and bicycle tires, E-SBR 1502 serves as a foundational elastomer in surgical and pharmaceutical stoppers, food-handling conveyor belts, braided textile and wire hoses, V-belts, adhesives, and impact-modified polymer blends with natural rubber, polybutadiene rubber (BR), and ethylene-propylene-diene monomer (EPDM). Available from Ataman Kimya in standard 35 kg polyethylene-wrapped bales packed in 1,050 kg or 1,260 kg wooden or metal box pallets, Stirene Butadiene Rubbers (SBR 1502) guarantees consistent ASTM D3185 cure characteristics, high tensile strength, and reliable mill and internal mixer dispersion.

CAS Number: 9003-55-8 (Benzene, ethenyl-, polymer with 1,3-butadiene; Styrene-1,3-butadiene copolymer)
EC Number: Polymer (Exempt from EINECS monomer listing; Monomer EC Numbers: Styrene EC 202-851-5 / CAS 100-42-5 and 1,3-Butadiene EC 203-450-8 / CAS 106-99-0; ELINCS / NLP Reference: 618-370-2)
Molecular Formula: (C8H8)x.(C4H6)y (Random elastomeric copolymer composed of ~23.5% w/w Styrene C8H8 repeating units and ~76.5% w/w 1,3-Butadiene C4H6 repeating units in trans-1,4, cis-1,4, and 1,2-vinyl microstructure)
Molecular Weight: Weight-Average Molecular Weight (Mw) approximately 450,000 to 650,000 g/mol; Number-Average Molecular Weight (Mn) approximately 130,000 to 190,000 g/mol; Polydispersity Index (Mw/Mn): 3.0 to 4.5 (Monomer Formula Weights: Styrene = 104.15 g/mol; 1,3-Butadiene = 54.09 g/mol)
INCI Name: STYRENE/BUTADIENE COPOLYMER
E Number: Not Applicable (Industrial elastomer; compliant with US FDA 21 CFR 177.2600 for rubber articles intended for repeated food contact and 21 CFR 175.105 for adhesives when compounded with authorized ingredients)
Melting Point: Amorphous non-crystalline elastomer with no first-order crystalline melting point; Glass Transition Temperature (Tg by DSC): -50.0 °C to -55.0 °C (-58.0 °F to -67.0 °F, typically -52.0 °C for 23.5% bound styrene cold E-SBR); softens viscoelastically above 60 °C to 130 °C during milling
Boiling Point: Not Applicable (High-molecular-weight solid copolymer; onset of thermal depolymerization and pyrolysis occurs above 300.0 °C to 350.0 °C / 572.0 °F to 662.0 °F; Flash Point of solid rubber > 260.0 °C to 300.0 °C)
Viscosity: Raw Polymer Mooney Viscosity ML (1+4) at 100 °C (ASTM D1646 / ISO 289): 46 to 58 Mooney Units (MU, typically 48 to 55 MU; Compounded Mooney Viscosity per ASTM D3185 Test Recipe: 70 to 90 MU at 100 °C)
Density: 0.930 to 0.945 g/cm3 (930 to 945 kg/m3, typically 0.940 g/cm3) at 20 °C to 25 °C for uncompounded raw SBR 1502 bale (ASTM D297 / ISO 2781)

Most Frequently Encountered Synonyms:
Stirene Butadiene Rubbers (SBR 1502)
STIRENE BUTADIENE RUBBERS (SBR 1502)
Styrene Butadiene Rubbers (SBR 1502)
Styrene Butadiene Rubber (SBR 1502)
STYRENE BUTADIENE RUBBER (SBR 1502)
Styrene Butadiene SBR 1502
SBR 1502
SBR-1502
E-SBR 1502
ESBR 1502
TSRC Taipol 1502
Ameripol 1502
Stiren Bütadien Kauçuk (SBR 1502)
Stiren-Bütadien Kauçuğu SBR 1502
Emülsiyon Stiren Bütadien Kauçuk 1502
Leke Bırakmayan SBR 1502 Kauçuk
Sentetik Kauçuk SBR 1502
CAS 9003-55-8
NLP 618-370-2

PRODUCT OVERVIEW, IISRP 1502 NOMENCLATURE AND MACROMOLECULAR ARCHITECTURE

Stirene Butadiene Rubbers (SBR 1502)—registered globally under CAS Number 9003-55-8 (Benzene, ethenyl-, polymer with 1,3-butadiene; EC / NLP Reference 618-370-2) and standardized by the International Institute of Synthetic Rubber Producers (IISRP) under numerical grade code 1502—is the world's premier light-colored, non-staining, non-oil-extended cold emulsion styrene-butadiene copolymer elastomer. Widely known across international tire manufacturing, footwear molding, industrial hose and belting, and technical rubber compounding under its synonyms Styrene Butadiene Rubbers (SBR 1502), Styrene Butadiene Rubber (SBR 1502), E-SBR 1502, Cold Emulsion SBR 1502, SKS-30 ARKPN (in GOST / CIS nomenclature), and in Turkish elastomer trade as Stiren Bütadien Kauçuk (SBR 1502) or Leke Bırakmayan SBR 1502, this versatile synthetic rubber is supplied by Ataman Kimya as pale cream to light amber solid 35 kg bales.
To understand why Stirene Butadiene Rubbers (SBR 1502) is specified as the benchmark light-colored synthetic elastomer worldwide, rubber technologists and procurement engineers examine its exact IISRP 1500-series designation and macromolecular chain microstructure:

Decoding the IISRP "1502" Classification Code:
Under the international IISRP (International Institute of Synthetic Rubber Producers) numbering system for Emulsion Styrene-Butadiene Rubbers (E-SBR):
- The 1000 Series indicates hot-polymerized non-pigmented E-SBR (polymerized at 50 °C, yielding highly branched, poorer-strength polymers).
- The 1500 Series indicates cold-polymerized non-pigmented, non-oil-extended ("dry") E-SBR (polymerized at 5 °C to 8 °C using a redox initiator system, yielding more linear chains, minimal micro-gel, and superior tensile and abrasion properties).
- The specific code "1502" within the 1500 series denotes four defining design parameters:
  (a) Nominal Bound Styrene Content: 23.5 percent by weight (specification range: 22.5 percent to 24.5 percent w/w; remaining ~76.5 percent w/w is polymerized 1,3-butadiene).
  (b) Emulsifier System: Mixed Soap Emulsifier—specifically an approximately 50:50 blend of disproportionated rosin acid soap and saturated/monounsaturated fatty acid soap (which leaves ~4.8 percent to 7.2 percent w/w bound organic acid in the coagulated rubber after acid-brine coagulation).
  (c) Stabilizer / Antioxidant System: Non-Staining, Non-Discoloring Antioxidant (typically 0.7 percent to 1.5 percent w/w of a hindered phenolic, alkylated diphenylamine-free, or tris(nonylphenyl) phosphite / phenolic blend), allowing SBR 1502 to be used in snow-white, pastel, transparent, and bright-colored rubber goods without UV yellowing or contact staining.
  (d) Coagulation Method: Salt-Acid (or Acid-Polyamine Alum-Free) Coagulation producing low ash (<= 0.50 percent w/w) and low residual soap (<= 0.50 percent w/w).

Diene Microstructure and Glass Transition Physics of SBR 1502:
Because cold free-radical emulsion copolymerization of styrene (C8H8) and 1,3-butadiene (CH2=CH-CH=CH2) at 5 °C proceeds randomly along the growing macroradical chain, the ~76.5 percent w/w butadiene fraction incorporates into the polymer backbone across three geometric isomer configurations (determined by FTIR / 1H and 13C NMR spectroscopy):
- Trans-1,4-Butadiene Units (-CH2-CH=CH-CH2- trans): Approximately 68.0 percent to 72.0 percent of the butadiene portion (~53 percent of total polymer).
- 1,2-Vinyl Butadiene Units (-CH2-CH(CH=CH2)- pendant vinyl side groups): Approximately 15.0 percent to 18.0 percent of the butadiene portion (~13 percent of total polymer).
- Cis-1,4-Butadiene Units (-CH2-CH=CH-CH2- cis): Approximately 12.0 percent to 15.0 percent of the butadiene portion (~10.5 percent of total polymer).
Because the random distribution of bulky aromatic phenyl rings (from the 23.5 percent bound styrene) and trans/cis/vinyl butadiene segments completely disrupts chain stereoregularity, Stirene Butadiene Rubbers (SBR 1502) is 100 percent amorphous with a single Glass Transition Temperature (Tg) between -50 °C and -55 °C (typically -52 °C). Unlike natural rubber (which contains > 99% cis-1,4-isoprene and undergoes strain-induced crystallization upon stretching, giving high pure-gum tensile strength of 20–28 MPa even without fillers), amorphous SBR 1502 does not strain-crystallize (pure-gum tensile strength is only ~2 to 4 MPa) and therefore requires reinforcing active fillers—such as Carbon Black (N220, N330, N550, N660) or Precipitated Hydrated Silica (15 to 60 phr with silane coupling agents)—whereupon vulcanized SBR 1502 achieves outstanding tensile strengths of 22.0 to 28.5 MPa and superior abrasion resistance!

Critical Distinction Between SBR 1502, SBR 1500, and SBR 1712 / 1723:
- SBR 1502 vs. SBR 1500: SBR 1500 is emulsified solely with rosin acid soap and stabilized with a dark, staining aromatic amine antioxidant (such as IPPD/6PPD/PBNA). Consequently, SBR 1500 turns dark brown/black in light and stains adjacent materials, making it usable only in black tire treads and black industrial goods. By contrast, Stirene Butadiene Rubbers (SBR 1502) uses a mixed rosin + fatty acid soap and a non-staining antioxidant—offering faster cure rates, cleaner mold release, and complete color stability for white, colored, and black goods alike!
- SBR 1502 vs. SBR 1712 / SBR 1723: The 1700 series (such as SBR 1712 with 37.5 phr high-aromatic oil or SBR 1723 with 37.5 phr TDAE/RAE low-PCA oil) are oil-extended grades containing 27.3 percent oil and staining antioxidants. SBR 1502 is 100 percent oil-free ("dry rubber"), allowing compounders to choose their own plasticizer type (paraffinic, naphthenic, white mineral oil, or ester plasticizer) and dosage without aromatic oil staining.

PHYSICAL, CHEMICAL AND RHEOLOGICAL PROPERTIES AND QUANTITATIVE SPECIFICATIONS

Every commercial shipment of Stirene Butadiene Rubbers (SBR 1502, CAS 9003-55-8) supplied by Ataman Kimya is manufactured under strict ISO 9001 quality control and certified against international ASTM, ISO, and IISRP analytical and vulcanization standards:

Raw Polymer Chemical and Physical Specifications:
- Visual Appearance at 20 °C: Light cream, pale beige, or light amber solid elastic rubber bales, free from foreign matter, rust, or dark scorched inclusions.
- Raw Polymer Mooney Viscosity ML (1+4) at 100 °C (ASTM D1646 / ISO 289-1, Large Rotor, 1-minute preheat + 4-minute reading at 100 °C): 46.0 to 58.0 Mooney Units (MU; standard prime batch range: 48.0 to 55.0 MU, with tight within-lot variation <= +/- 3.0 MU).
- Bound Styrene Content (Refractive Index or FTIR Method per ASTM D5775 / ISO 21561): 22.5 percent to 24.5 percent w/w (nominal target: 23.5 percent w/w; Bound 1,3-Butadiene Content: 75.5 percent to 77.5 percent w/w).
- Volatile Matter / Moisture Content (Hot-Mill or Oven Drying Loss at 105 °C per ASTM D5668 / ISO 248): <= 0.50 percent to 0.75 percent w/w (typical batch value: 0.15 percent to 0.40 percent w/w).
- Total Ash Content (Furnace Ignition at 550 °C per ASTM D5667 / ISO 247): <= 0.50 percent w/w (typical batch value: 0.10 percent to 0.30 percent w/w).
- Organic Acid Content (Residual Bound Rosin + Fatty Acids by Titration per ASTM D5774): 4.75 percent to 7.10 percent w/w (typical batch value: 5.20 percent to 6.50 percent w/w; note that this built-in organic acid acts as a natural co-activator with Zinc Oxide during sulfur vulcanization!).
- Organic Soap Content (Residual Unacidified Sodium/Potassium Rosinate & Fatty Acid Soap per ASTM D5774): <= 0.50 percent w/w (typical batch value: 0.05 percent to 0.25 percent w/w).
- Non-Staining Antioxidant Content (Phenolic / Phosphite Stabilizer): Approximately 0.70 percent to 1.50 percent w/w.
- Raw Polymer Specific Gravity / Density (ASTM D297 / ISO 2781): 0.935 to 0.945 g/cm3 (935 to 945 kg/m3, nominal 0.940 g/cm3) at 23 °C.
- Gel Content (Insoluble Macro-Gel in Toluene at 25 °C): <= 1.0 percent w/w (typical: < 0.2 percent w/w, ensuring smooth extrusion and calendering surfaces).
- Residual Free Styrene Monomer Content (Headspace GC): <= 0.03 percent to 0.05 percent w/w (< 300 to 500 ppm).

Standard ASTM D3185 Test Recipe Compounding and Cure Rheometry Specifications:
To verify batch-to-batch vulcanization consistency, Stirene Butadiene Rubbers (SBR 1502) is tested in the standard ASTM D3185 Reference Test Recipe (SBR 1502: 100.00 phr; Industry Reference Black IRB / N330 Carbon Black: 50.00 phr; Zinc Oxide: 3.00 phr; Stearic Acid: 1.00 phr; TBBS Accelerator N-tert-butyl-2-benzothiazolesulfenamide: 1.00 phr; Sulfur: 1.75 phr; Total = 156.75 phr):
- Compounded Mooney Viscosity ML (1+4) at 100 °C (ASTM D1646): <= 85.0 to 90.0 MU (typical range: 72.0 to 84.0 MU).
- Oscillating Disc Rheometer (ODR, ASTM D2084) or Moving Die Rheometer (MDR, ASTM D5289 / ISO 6502) at 160 °C (1° arc, 1.67 Hz, 30 min test):
  - Minimum Torque (ML): 1.5 to 2.8 dN.m (lbf.in).
  - Maximum Torque (MH): 14.5 to 21.0 dN.m.
  - Scorch Time ts1 (Time to 1 dN.m rise above ML at 160 °C): 4.5 to 8.5 minutes (typical: 5.5 to 7.2 minutes, demonstrating safe processing scorch delay).
  - Optimum Cure Time t50 (Time to 50% state of cure at 160 °C): 7.5 to 13.0 minutes.
  - Optimum Cure Time t90 (Time to 90% state of cure at 160 °C): 13.0 to 21.0 minutes (typical: 14.5 to 18.5 minutes).

Vulcanizate Mechanical Properties (Press-Cured at 145 °C for 35 minutes or 160 °C per ASTM D3185 / ASTM D412 / ISO 37):
- Tensile Strength at Break (ASTM D412 Die C): >= 23.5 to 24.5 MPa (typical commercial batch value: 25.0 to 28.5 MPa / 3,625 to 4,130 psi).
- Elongation at Break (ASTM D412): >= 420 percent to 450 percent (typical batch value: 480 percent to 580 percent).
- Modulus at 300% Elongation (M300, 35 min cure at 145 °C): 12.5 to 18.5 MPa (typical: 14.0 to 17.0 MPa).
- Shore A Durometer Hardness (ASTM D2240 / ISO 7619): 60 to 67 Shore A (in the 50 phr N330 black test recipe; tunable from 35 to 90 Shore A in commercial formulations).
- Tear Resistance (Crescent Die B or Angle Die C, ASTM D624): 45 to 68 kN/m.
- Akron / DIN Abrasion Volume Loss (ISO 4649, 10 N load): 85 to 115 mm3 (demonstrating high wear resistance).
- Rebound Resilience (Lupke / Schob Pendulum at 23 °C, ISO 4662): 42 percent to 52 percent.
- Service Temperature Envelope of Vulcanized SBR 1502 Articles: Continuous dynamic service from -45 °C to +100 °C (-49 °F to +212 °F), with intermittent peak tolerance up to +115 °C to +120 °C.

COLD EMULSION POLYMERIZATION PROCESS AND MIXED-SOAP TECHNOLOGY

The industrial synthesis of Stirene Butadiene Rubbers (SBR 1502) via continuous cold free-radical emulsion polymerization is a precision-engineered multi-reactor process designed to control molecular weight distribution, suppress chain branching, and balance rosin/fatty acid soap functionality:

Step 1 - Monomer Purification and Aqueous Soap Micelle Emulsification:
Inhibitor-free 1,3-butadiene (~71 to 72 parts by weight) and styrene (~28 to 29 parts by weight) are emulsified in deoxygenated demineralized water (~180 to 200 parts) using ~4.5 parts of a mixed anionic emulsifier system consisting of roughly equal proportions of potassium/sodium disproportionated rosinate (derived from pine gum rosin whose conjugated abietic acid double bonds have been catalytically disproportionated into dehydroabietic and dihydroabietic acids so they will not retard free-radical polymerization) and sodium/potassium tallow or vegetable fatty acid soap (stearate/palmitate/oleate), along with a tertiary dodecyl mercaptan (TDDM, ~0.15 to 0.25 parts) chain-transfer modifier to regulate molecular weight and Mooney viscosity.

Step 2 - Continuous Cold Redox Polymerization at 5 °C to 8 °C (Battery of 10 to 12 CSTRs):
The emulsified monomer-water feed is chilled by ammonia refrigeration coils to 5 °C to 8 °C (41 °F to 46 °F) and pumped continuously through a train of 10 to 12 stirred-tank reactors in series. Polymerization is initiated by a cold redox free-radical system: an organic hydroperoxide oxidant (typically p-menthane hydroperoxide or diisopropylbenzene hydroperoxide) reacts with ferrous sulfate (FeSO4.7H2O) complexed with EDTA and sodium formaldehyde sulfoxylate (SFS / Rongalite) to generate active free radicals at 5 °C.
Why is SBR 1502 polymerized at 5 °C ("Cold SBR") and stopped at 60 percent to 65 percent monomer conversion?
- Suppressing Chain Branching & Cross-Linked Micro-Gel: At 5 °C, the ratio of linear chain propagation to intermolecular hydrogen abstraction and cross-linking is maximized, and trans-1,4 microstructure increases to ~70 percent. Crucially, polymerization is intentionally "short-stopped" at 60 percent to 65 percent monomer conversion (after ~6 to 8 hours residence time) by injecting a non-discoloring short-stopping agent (such as sodium dimethyldithiocarbamate, SDD, paired with diethylhydroxylamine or sodium nitrite/polysulfide). Allowing conversion to exceed 70 percent would deplete monomer inside the latex particles, causing growing polymer radicals to attack dead polymer chains and form intractable, high-Mooney branched macro-gels!

Step 3 - Monomer Stripping, Non-Staining Antioxidant Addition, and Salt-Acid Coagulation:
Unreacted 1,3-butadiene gas is flashed off in vacuum flash tanks, and unreacted styrene monomer is stripped in a perforated-plate vacuum steam-stripping column for recycle. A non-staining, non-discoloring antioxidant emulsion (typically 1.0 to 1.25 phr of hindered phenolic or alkylated phenol/phosphite stabilizer) is blended into the stripped SBR 1502 latex. The latex is then coagulated into porous rubber crumb by adding sodium chloride brine (or polyamine coagulant) and dilute sulfuric acid at pH 3.5 to 4.5, which converts the water-soluble rosinate and fatty acid soaps into water-insoluble free rosin acid and stearic/oleic acid (~4.8% to 7.1% w/w) intimately dispersed throughout the rubber matrix.

Step 4 - Dewatering, Apron Drying, and 35 kg Bale Pressing:
The coagulated SBR 1502 crumb is washed with demineralized water to lower ash and free soap below 0.5 percent, dewatered in mechanical screw expellers, dried in multi-pass hot-air apron dryers at 75 °C to 95 °C to a moisture content below 0.4 percent, compressed into dense 35 kg rectangular bales, and wrapped in low-melting polyethylene (LDPE/EVA) film that can be charged directly into Banbury internal mixers without unwrapping.

VULCANIZATION CHEMISTRY AND SYNERGY OF THE MIXED ROSIN-FATTY ACID SOAP SYSTEM

Understanding how the residual ~5 percent to 7 percent organic acid in Stirene Butadiene Rubbers (SBR 1502) interacts with curing agents and fillers allows rubber compounders to optimize scorch safety, cure rate, and mechanical properties:

 Why Mixed Soap in SBR 1502 Outperforms Pure Rosin Soap (SBR 1500) and Pure Fatty Acid Soap (SBR 1509):
- Role of the Rosin Acid Fraction (~2.5% to 3.5% w/w in SBR 1502): Disproportionated rosin acids (bulky tricyclic diterpene carboxylic acids, MW ~302 g/mol) act as internal tackifiers and pigment wetting agents. They impart vital "building tack" (green strength and auto-adhesion between uncured rubber plies during tire sidewall, hose, and footwear assembly) and improve tensile and tear strength. However, rosin acid alone (as in SBR 1500) slightly retards sulfur vulcanization and tends to stick to hot two-roll mill rolls.
- Role of the Fatty Acid Fraction (~2.5% to 3.5% w/w in SBR 1502): Linear C16–C18 fatty acids (stearic and palmitic acid) react rapidly with Zinc Oxide (ZnO, 3 to 5 phr) to form soluble zinc stearate accelerator-activator complexes, speeding up sulfenamide/thiazole cure kinetics, increasing final cross-link density (higher 300% modulus), and providing clean, effortless mill-roll release and mold release. Thus, the 50:50 mixed soap architecture of Stirene Butadiene Rubbers (SBR 1502) delivers the ideal balance of building tack, fast cure rate, and smooth processing!

 Sulfur vs. Peroxide Vulcanization Systems for SBR 1502:
- Accelerated Sulfur Vulcanization (Standard Tire, Footwear & Mechanical Goods): Because SBR 1502 has fewer double bonds per unit weight than natural rubber and lacks allylic methyl groups that activate alpha-methylene C-H bonds, SBR 1502 requires slightly lower elemental sulfur (1.5 to 2.2 phr vs. 2.5 to 3.0 phr in NR) but a higher dosage of primary and secondary accelerators—typically 1.0 to 1.6 phr of a delayed-action sulfenamide (CBS, TBBS, or MBS) or thiazole (MBT, MBTS) boosted with 0.15 to 0.40 phr of a ultra-accelerator such as Diphenylguanidine (DPG, especially in silica-filled white/colored compounds), Tetramethylthiuram Disulfide (TMTD), or Zinc Diethyldithiocarbamate (ZDEC). Unlike NR, sulfur-cured SBR 1502 shows high resistance to "cure reversion" (marching or plateau modulus at 160 °C–175 °C rather than anaerobic chain scission).
- Organic Peroxide Cross-Linking (Low-Compression-Set Seals, Gaskets & Profiles): Curing SBR 1502 with 1.5 to 3.5 phr of Dicumyl Peroxide (DCP) or Bis(tert-butylperoxyisopropyl)benzene (BIPB) plus 1.0 to 3.0 phr of a coagent (TAIC, TAC, or ZDMA) creates thermally stable carbon-carbon (C-C) cross-links, achieving ultra-low compression set (10 percent to 18 percent after 24 hours at 100 °C) and continuous heat resistance up to 115 °C.

COMPREHENSIVE INDUSTRIAL APPLICATIONS AND COMPOUNDING FORMULATION GUIDELINES

Thanks to its non-staining light color, 46 to 58 MU Mooney viscosity, mixed-soap processability, and compatibility with both white mineral fillers and carbon black, Stirene Butadiene Rubbers (SBR 1502) supplied by Ataman Kimya is utilized across eight major rubber manufacturing sectors:

 White, Pastel, and Bright-Colored Footwear Outsoles, Midsoles, and Vulcanized Canvas Shoes:
Footwear manufacturing represents one of the highest-volume markets for Stirene Butadiene Rubbers (SBR 1502):
- Athletic, Casual, and Tennis Shoe Outsoles: Compounded with 30 to 55 phr of Precipitated Hydrated Silica (plus 2 to 4 phr PEG-4000 / diethylene glycol activator to prevent silica from adsorbing basic accelerators, and 1 to 3 phr Si-69 silane coupling agent), 10 to 25 phr of Titanium Dioxide (TiO2) or organic color pigments, and often blended 70:30 or 60:40 with Natural Rubber (SMR CV / Pale Crepe), High-Styrene Resin (SBR 1904 / HSR for higher hardness), or Polybutadiene Rubber (BR 9000 for extreme abrasion), SBR 1502 produces non-marking, non-yellowing, flex-crack-resistant shoe soles.
- Cellular / Microcellular Sponge Midsoles and Flip-Flops: Blown with azodicarbonamide (ADC) or OBSH chemical foaming agents to produce lightweight, resilient closed-cell footwear sheets.

 Automotive, Bicycle, Motorcycle, and Industrial Tire Components:
- White Sidewall (WSW) and Colored Lettering Tire Compounds: Because SBR 1502 contains zero staining amines or aromatic oils, it is blended with Chlorobutyl Rubber (CIIR), Natural Rubber, and EPDM to manufacture snow-white tire sidewalls and colored motorcycle/bicycle tires that resist ozone cracking and brown antioxidant migration.
- Passenger Car, Light Truck, and Bicycle Tire Treads & Carcass Plies: Blended with Solution SBR, BR, or NR to provide optimal wet-grip traction (high tan delta at 0 °C to 20 °C), low wear rate, and stable high-speed heat aging.

 Light-Colored and Black Conveyor Belts, V-Belts, and Power Transmission Belting:
Used in food-grade white/beige conveyor belt covers (for grain, sugar, bakery, and food-packaging lines compliant with FDA 21 CFR 177.2600), textile-reinforced industrial conveyor belts, and wrapped V-belt friction skim coats where SBR 1502 provides superior heat-aging resistance and flex life compared to pure natural rubber.

 Industrial, Braided, Hydraulic, and Garden Hoses:
Formulated into extruded and mandrel-built water hoses, compressed-air hoses, washing-machine inlet/outlet hoses, LPG gas hoses (outer colored covers), and steam hose covers requiring smooth extruder die swell control, ozone/weathering protection (with paraffin/microcrystalline wax and non-staining antidegradants), and vibrant color coding.

 Rubber Flooring, Mats, Rollers, and Sporting Goods:
- Studded Rubber Floor Tiles, Hospital/Gym Flooring, and Escalator Handrails: SBR 1502 compounded with calcine clay, precipitated silica, aluminum trihydrate (ATH flame retardant), and inorganic pigments yields wear-resistant, non-marking architectural rubber flooring.
- Printing, Textile, and Paper-Mill Rubber Rollers: Provides uniform grinding finish, solvent resistance against aliphatic hydrocarbons and alcohols, and stable Shore A hardness from 35 to 85 Shore A.

 Wire and Cable Insulation & Jacketing, Pharmaceutical Stoppers, and Molded Technical Seals:
Used in flexible low-voltage rubber cables, household appliance cords, washing-machine door boot seals (blended with EPDM), O-rings, pedal pads, grommets, and non-toxic toy/pharmaceutical rubber stoppers.

 Adhesives, Sealants, Carpet Backing, and Brake Lining Binders:
Masticated SBR 1502 dissolves in aromatic, aliphatic, and ketone/ester solvent blends (with phenolic or hydrocarbon tackifier resins) to manufacture pressure-sensitive tapes, footwear contact cements, automotive mastic sealants, and asbestos-free friction brake pad and clutch facing binders.

 Practical Guide Compounding Formulations Featuring Stirene Butadiene Rubbers (SBR 1502):
- Guide Formulation 1 (Non-Marking White / Colored Athletic Shoe Outsole Compound, 62 Shore A): Stirene Butadiene Rubbers (SBR 1502) 70.0 phr, Pale Crepe Natural Rubber (or BR 9000) 30.0 phr, Precipitated Hydrated Silica (175 m2/g BET) 42.0 phr, Polyethylene Glycol (PEG 4000, Silica Activator) 2.5 phr, Bis(triethoxysilylpropyl)tetrasulfide Silane (Si-69) 2.0 phr, Rutile Titanium Dioxide (TiO2) 8.0 phr, Naphthenic / White Paraffinic Process Oil 12.0 phr, Coumarone-Indene or C9 Tackifying Resin 4.0 phr, Zinc Oxide 3.5 phr, Stearic Acid 1.5 phr, Non-Staining Phenolic Antioxidant (BHT / Wingstay L / Irganox 1076) 1.2 phr, Microcrystalline Wax 1.0 phr, MBTS Accelerator 1.2 phr, DPG Secondary Accelerator 0.8 phr, and Sulfur 2.0 phr.
- Guide Formulation 2 (High-Abrasion Industrial Black Conveyor Belt Cover & Molded Goods, 65 Shore A): Stirene Butadiene Rubbers (SBR 1502) 100.0 phr, N330 (HAF) Carbon Black 52.0 phr, Ground Calcium Carbonate / Hard Clay 15.0 phr, Process Oil (TDAE / Naphthenic) 10.0 phr, Zinc Oxide 4.0 phr, Stearic Acid 1.5 phr, TMQ + 6PPD Antidegradant System 2.0 phr, CBS (N-Cyclohexyl-2-benzothiazolesulfenamide) Accelerator 1.3 phr, TMTD Secondary Accelerator 0.25 phr, and Sulfur 1.8 phr.

PACKAGING, STORAGE AND HANDLING GUIDELINES

To preserve the pale cream color, raw Mooney viscosity (46 to 58 MU), low moisture content, and bale dimensional integrity of Stirene Butadiene Rubbers (SBR 1502, CAS 9003-55-8), rubber warehouses and compounding plants should follow the storage and handling protocols established by Ataman Kimya:
Commercial Packaging Configurations Supplied by Ataman Kimya:
- Standard 35 kg (+/- 0.5 kg) Net Rectangular Bales: Individually wrapped in transparent, low-melting-point (90 °C to 105 °C), 0.05 mm to 0.08 mm thick low-density polyethylene (LDPE) or EVA film dusted lightly with anti-blocking talc/calcium stearate so the entire wrapped bale can be fed directly into internal Banbury or intermeshing mixers at > 110 °C without stripping the film.
- Palletized Box Crate Units (1,050 kg or 1,260 kg Net): 30 bales (1,050 kg net) or 36 bales (1,260 kg net) stacked inside heavy-duty returnable galvanized steel post-pallets, ISPM-15 heat-treated wooden box crates, or reinforced triple-wall corrugated octabins on 4-way entry pallets.

Storage Conditions, Cold-Flow Prevention, and Shelf Life:
 Cool, Dry, Dark Indoor Warehouse Storage (< 35 °C / 95 °F, ISO 2230 Standard): Store Stirene Butadiene Rubbers (SBR 1502) in a covered, dry, well-ventilated indoor warehouse maintained between +5 °C and +35 °C (41 °F to 95 °F), away from direct sunlight, ultraviolet lamps, rain, steam boilers, and electrical motors/transformers that generate ozone (O3). Direct UV sunlight can cause surface cross-linking (gel formation) and yellowing even in non-staining SBR 1502.
 Crate Stacking Limits to Prevent Cold Flow: Because unvulcanized SBR 1502 is a viscoelastic amorphous polymer, excessive vertical pressure at warm warehouse temperatures causes bales to deform slowly ("cold flow"). Stack wooden or metal box pallets no more than 2 to 3 crates high (and never stack loose uncrated bales more than 4 bales high).
 Certified Shelf Life: When stored in original sealed crate packaging in a cool, dark, dry warehouse (< 35 °C), Stirene Butadiene Rubbers (SBR 1502) has a certified shelf life of 18 to 24 months (up to 36 months upon re-testing of Mooney viscosity and volatile matter) from the date of manufacture.

FIRST AID MEASURES, TOXICOLOGY AND SAFETY INFORMATION

Stirene Butadiene Rubbers (SBR 1502, CAS 9003-55-8) is a high-molecular-weight (~500,000 g/mol), water-insoluble, biologically inert solid polymer that is NOT classified as a hazardous substance or mixture under European Union Regulation (EC) No 1272/2008 (CLP) or the UN Globally Harmonized System (GHS). It carries no GHS hazard pictograms, signal words, or hazard statements.

Toxicological Profile and Processing Fume Control:
- Solid Polymer Inertness: In solid bale form at ambient temperature, SBR 1502 is non-toxic, non-irritating to skin, non-volatile, and non-sensitizing (completely free of natural Hevea brasiliensis latex proteins that cause Type I natural rubber latex allergies!).
- Thermal Processing & Vulcanization Fumes (130 °C to 200 °C): During hot Banbury mixing, two-roll milling, extrusion, and press curing at 140 °C to 200 °C, trace volatile organic compounds—including rosin/fatty acid soap vapors, trace residual styrene monomer (< 0.03%), and vulcanization accelerator fumes—are emitted. Mixing and curing areas must be equipped with local exhaust ventilation (LEV) hoods to keep workplace air below occupational exposure limits (Styrene TWA = 20 ppm / 85 mg/m3; Rubber Fume TWA = 0.6 mg/m3).

First Aid Measures in Rubber Compounding Plants:
- Inhalation: No hazard at room temperature. If a worker inhales concentrated hot rubber mixing or curing fumes and experiences dizziness, headache, or throat irritation, move them immediately to fresh air and seek medical attention if symptoms persist.
- Skin Contact: Handling solid bales at room temperature poses no hazard; wash hands with soap and water before eating. If skin contacts hot masticated SBR 1502 compound (100 °C to 180 °C) from a mill or extruder, immediately immerse or flush the burned area with cold running water for at least 15 minutes; do NOT attempt to peel adhered hot rubber from burned skin, and obtain immediate medical treatment.
- Eye Contact: Flush eyes with lukewarm running water or eyewash saline for 10 to 15 minutes if rubber crumb or dust enters the eye.
- Ingestion: Biologically inert solid; rinse mouth with water and consult a physician if swallowed.

Fire-Fighting Measures:
- Suitable Extinguishing Media: Solid SBR 1502 has an auto-ignition temperature > 320 °C to 360 °C, but once ignited in a warehouse fire, rubber bales burn with intense heat and dense black aromatic smoke (containing CO, CO2, styrene, butadiene, and soot). Extinguish using copious water fog/spray, alcohol-resistant or AFFF foam, dry chemical powder (ABC), or CO2. Firefighters must wear positive-pressure self-contained breathing apparatus (SCBA) and full protective bunker gear.

REGULATORY STATUS, COMPLIANCE AND INTERNATIONAL CLASSIFICATIONS

Stirene Butadiene Rubbers (SBR 1502, CAS 9003-55-8) complies with major global polymer, food-contact, toy, and environmental regulations:

 EU REACH, RoHS, PAH-Free, and Nitrosamine-Free Status:
- EU REACH Regulation (EC) No 1907/2006: As a high-molecular-weight polymer, SBR 1502 itself is exempt from REACH registration under Article 2(9), while its constituent monomers (Styrene CAS 100-42-5 and 1,3-Butadiene CAS 106-99-0) and non-staining stabilizers are fully REACH-registered. SBR 1502 contains zero SVHCs (Substances of Very High Concern on the ECHA Candidate List).
- PAH-Free (EU REACH Annex XVII Entry 50 / AfPS GS 2019:01 PAK Category 1): Because SBR 1502 is a non-oil-extended ("dry") synthetic rubber containing zero polycyclic aromatic hydrocarbon (PAH) extender oils, it satisfies the strictest German GS Mark and EU REACH Annex XVII PAH limits (< 0.2 mg/kg BaP and < 1.0 mg/kg sum of 15/18 PAHs) for tools, sporting goods, footwear, and children's toys!
- EU RoHS & Toy Safety EN 71-3: 100 percent free of heavy metals (Pb, Cd, Hg, Cr6+), PBB/PBDE flame retardants, ortho-phthalates, and nitrosamines.

 Food-Contact Elastomer Approvals (US FDA 21 CFR & BfR XXI):
Approved as a base elastomer under US FDA 21 CFR 177.2600 ("Rubber articles intended for repeated use" in contact with aqueous and fatty foods), 21 CFR 175.105 (Adhesives), and 21 CFR 177.1210 (Closures with sealing gaskets), as well as German BfR Recommendation XXI for food-contact rubber commodities when compounded with compliant curatives and fillers.

 International Transport Classification (ADR / RID / IMDG / IATA):
Stirene Butadiene Rubbers (SBR 1502) in solid bales is Not Regulated as Dangerous Goods for road, rail, sea, or air transport (UN Number: Not Regulated; Hazard Class: None; Marine Pollutant: No).

FREQUENTLY ASKED QUESTIONS (FAQ)

 What is Stirene Butadiene Rubbers (SBR 1502) and what do the digits "1502" stand for?
tirene Butadiene Rubbers (SBR 1502, CAS 9003-55-8) is a general-purpose, non-oil-extended elastomeric copolymer synthesized by cold free-radical emulsion polymerization of approximately 23.5 percent styrene and 76.5 percent 1,3-butadiene at 5 °C to 8 °C. Under the international IISRP numbering system, the "1500" series designates cold-polymerized, non-pigmented, non-oil-extended emulsion SBR, and the specific grade code "1502" designates a polymer emulsified with a mixed rosin acid and fatty acid soap system and protected by a non-staining, non-discoloring antioxidant with a raw Mooney viscosity ML (1+4) at 100 °C of 46 to 58 MU.

 What is the key difference between SBR 1502 and SBR 1500 in rubber compounding?
Both SBR 1502 and SBR 1500 are cold emulsion copolymers with 23.5 percent bound styrene and ~50 MU Mooney viscosity, but they differ in their soap and antioxidant systems. SBR 1500 uses 100 percent rosin acid soap and a dark, staining aromatic amine antioxidant, restricting it solely to black rubber products like black tire treads. By contrast, Stirene Butadiene Rubbers (SBR 1502) uses a 50:50 mixed rosin acid + fatty acid soap and a non-staining phenolic/phosphite antioxidant—enabling SBR 1502 to be used in white tire sidewalls, white/colored shoe soles, light-colored floor tiles, and transparent goods while offering faster cure rates and superior mill-roll release.

 Why does SBR 1502 require reinforcing fillers like Carbon Black or Precipitated Silica to achieve high tensile strength?
Unlike natural rubber (which is > 99 percent stereoregular cis-1,4-polyisoprene and crystallizes spontaneously when stretched, giving 20–28 MPa tensile strength even without fillers), Stirene Butadiene Rubbers (SBR 1502) has a random copolymer chain of styrene and trans-1,4 / cis-1,4 / 1,2-vinyl butadiene units that cannot strain-crystallize. Therefore, unfilled "pure-gum" SBR 1502 has a low tensile strength of only 2 to 4 MPa; however, when compounded with 30 to 60 phr of reinforcing Carbon Black (N220, N330, N550) or Precipitated Silica (for white/colored goods), SBR 1502 achieves high tensile strengths of 23 to 28.5 MPa and outstanding abrasion resistance.

 How does the residual 4.8% to 7.1% organic acid in SBR 1502 affect mixing and sulfur vulcanization?
During manufacture, acid-salt coagulation converts the mixed rosin and fatty acid soap emulsifiers into 4.8 percent to 7.1 percent w/w free rosin acid and stearic/palmitic acid intimately dispersed inside the SBR 1502 bale. During mixing and vulcanization, the rosin acid fraction provides green building tack and pigment dispersion, while the fatty acid fraction reacts with Zinc Oxide (ZnO) to activate sulfur accelerators and prevent mill sticking. Because SBR 1502 already contains ~3 phr of internal fatty acid, compounders typically need to add only 1.0 to 1.5 phr of external stearic acid.

 What is the difference between Stirene Butadiene Rubbers (SBR 1502) and oil-extended grades like SBR 1712 or SBR 1723?
Stirene Butadiene Rubbers (SBR 1502) is a 100 percent oil-free ("dry") polymer containing zero aromatic extender oil and zero polycyclic aromatic hydrocarbons (PAHs). By contrast, 1700-series grades (such as SBR 1712 and SBR 1723) are high-molecular-weight base rubbers pre-blended at the latex stage with 37.5 phr (27.3% w/w) of dark aromatic or TDAE extender oil and staining antioxidants for low-cost black tire treads. Choosing oil-free SBR 1502 allows compounders to formulate PAH-free, non-staining, food-contact, and brightly colored compounds using clean paraffinic or white mineral oils.

 How should silica-filled white or colored SBR 1502 footwear compounds be accelerated to prevent slow curing?
Precipitated hydrated silica has acidic silanol (-Si-OH) groups on its surface that strongly adsorb basic sulfur accelerators (like CBS, TBBS, or MBTS) and zinc ions, retarding cure rate and lowering modulus if left uncompensated. When compounding white or colored SBR 1502 with 30 to 55 phr of precipitated silica, always add 2.0 to 3.5 phr of Polyethylene Glycol (PEG 4000) or Diethylene Glycol (DEG) or Triethanolamine (TEA) to coat the acidic silanol sites, along with 0.5 to 1.0 phr of Diphenylguanidine (DPG) as a secondary alkaline booster and 1.0 to 2.5 phr of Si-69 silane coupling agent.

 Can Stirene Butadiene Rubbers (SBR 1502) be blended with Natural Rubber (NR), Polybutadiene (BR), or EPDM?
Yes, SBR 1502 is fully co-vulcanizable in all proportions with Natural Rubber (NR / IR) and Polybutadiene Rubber (BR 9000): blending SBR 1502 with NR combines the high green strength, tear resistance, and low heat build-up of NR with the superior abrasion resistance, wet grip, and heat-aging stability of SBR 1502; blending SBR 1502 with BR maximizes abrasion life and low-temperature flexibility (-60 °C) in tire treads and shoe soles. SBR 1502 can also be blended with high-diene EPDM or Chlorobutyl (CIIR) in weather-resistant white tire sidewalls and appliance seals.

 Can the polyethylene wrapping film on 35 kg SBR 1502 bales be fed directly into an internal Banbury mixer?
Yes, the thin low-density polyethylene (LDPE / EVA) film wrapping each 35 kg SBR 1502 bale has a low Vicat softening and melting point of 90 °C to 105 °C. When the batch temperature inside an internal Banbury or intermeshing mixer reaches 110 °C to 135 °C, the film melts completely and disperses molecularly as a minor processing aid without affecting physical properties. However, if mixing is performed on an open two-roll mill at low temperatures (< 80 °C), the polyethylene film must be stripped off first to prevent undispersed plastic specks.

 Is Stirene Butadiene Rubbers (SBR 1502) free of Natural Latex Proteins and compliant with PAH and Food-Contact rules?
Yes, as a 100 percent synthetic copolymer, SBR 1502 contains zero natural Hevea latex proteins and cannot trigger Type I latex allergies. Furthermore, because it contains no extender oils or staining amines, SBR 1502 is 100 percent PAH-free (compliant with EU REACH Annex XVII Entry 50 and German GS Mark Category 1) and is cleared under US FDA 21 CFR 177.2600 for repeated-use food-contact rubber articles such as white food conveyor belts, milking inflations, and jar gaskets.

 How can tire plants, footwear manufacturers, and rubber compounders source Stirene Butadiene Rubbers (SBR 1502) and request COA, TDS, and SDS documents from Ataman Kimya?
Manufacturers can procure Stirene Butadiene Rubbers (SBR 1502, CAS 9003-55-8, Mooney Viscosity 46–58 MU, 23.5% Bound Styrene) in standard 35 kg PE-wrapped bales packed in 1,050 kg or 1,260 kg wooden or steel box pallets—complete with batch-specific Certificates of Analysis (COA including MDR/ODR cure curves and ASTM D3185 tensile data), Technical Data Sheets (TDS), and GHS/CLP Safety Data Sheets (SDS)—directly from Ataman Kimya by calling +90 216 577 10 10 or emailing info@atamankimya.com.

TECHNICAL SUMMARY

Stirene Butadiene Rubbers (SBR 1502)—universally recognized across international elastomer standards as Styrene Butadiene Rubber (SBR 1502), E-SBR 1502, Cold Emulsion Styrene-Butadiene Copolymer, IISRP Code 1502, SKS-30 ARKPN, and Stiren Bütadien Kauçuk SBR 1502 (CAS Number 9003-55-8, EC / NLP Reference 618-370-2, Empirical Formula (C8H8)x.(C4H6)y)—stands as the global benchmark non-staining, non-oil-extended cold emulsion synthetic rubber for light-colored, transparent, and black elastomeric compounds. Synthesized at 5 °C to 8 °C with a 50:50 mixed rosin-acid and fatty-acid soap emulsifier system and protected by a non-discoloring antioxidant, SBR 1502 is tightly controlled to a nominal 23.5 percent bound styrene content (22.5 percent to 24.5 percent w/w), a raw Mooney viscosity ML (1+4) at 100 °C of 46 to 58 MU, residual organic acid of 4.75 percent to 7.10 percent w/w, low ash and soap content (<= 0.50 percent w/w), a glass transition temperature (Tg) of -52 °C, and vulcanized ASTM D3185 tensile strength exceeding 23.5 to 28.5 MPa with elongation at break >= 450 percent.

Ataman Kimya supplies premium Stirene Butadiene Rubbers (SBR 1502) in standard 35 kg low-melt polyethylene-wrapped bales unitized in 1,050 kg and 1,260 kg box pallets for tire treads and white sidewalls, athletic and casual footwear outsoles, food-grade and industrial conveyor belts, braided hoses, rubber flooring, rollers, cables, and technical molded goods, backed by ready warehouse stock in Turkey, strict batch-to-batch rheometric verification, and fast domestic and international logistics. To request a commercial quotation, full-container or pallet pricing, Technical Data Sheets (TDS), Safety Data Sheets (SDS), or a batch-specific Certificate of Analysis (COA) for Stirene Butadiene Rubbers (SBR 1502, CAS 9003-55-8), please contact the technical sales team at Ataman Kimya using the contact details below.

Ataman Chemicals
Phone: +90 216 577 10 10
Email: info@atamankimya.com