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Royalene 556 EPDM offers low die swell and high extrusion rate.
Royalene 556 EPDM is designed for processing by profile extrusion.
Royalene 556 EPDM is used in hoses applications.
CAS number: 25038-36-2 (typical for ethylene/propylene/diene terpolymers used for EPDM trade grades).
EC / EINECS number: 500‑039‑8 for ethylene/propylene/diene terpolymer class
Molecular Formula: EPDM is a polymer, so there is no single small-molecule formula.
The repeat-unit formula can be described as (C₂H₄)x-(C₃H₆)y-(C₉H₁₂)z, where x/y/z reflect the ethylene, propylene, and ENB diene content.
Molecular Weight: As a polymer, there is no single molecular weight. Molecular weight varies by batch and is usually expressed as number-average (Mn) or weight-average (Mw) in the range typical for medium-MW EPDM, often around 100,000–300,000 g/mol depending on grade and polymerization
SYNONYMS:
Ethylene propylene diene terpolymer, EPDM, Ethylene-Propylene-Diene Monomer rubber, Ethylene/Propylene/Diene terpolymer, Poly(ethylene-co-propylene-co-5-ethylidene-2-norbornene), Bicyclo[2.2.1]hept-2-ene,5-ethylidene-, polymer with ethene and 1-propene, EPM rubber
Royalene 556 EPDM is a highly extendable, ethylene propylene diene (EPDM) rubber.
Royalene 556 EPDM contains a non-staining stabilizer.
Royalene 556 EPDM (ethylene-propylene-diene monomer) terpolymer made for extrusion, hose and profile applications where good processability and final part performance are required.
Royalene 556 EPDM is supplied as friable bales to aid dispersion in internal mixers and is formulated to give high green strength and excellent shape stability during extrusion.
Royalene 556 EPDM is designed to deliver low die swell and a high extrusion rate, making it attractive for continuous profile production.
Chemically, Royalene 556 EPDM is an ethylene/propylene/ENB (ethylidene norbornene) terpolymer — that is, a saturated polyethylene/propylene backbone with isolated unsaturation provided by the ENB comonomer in side chains which serve as crosslinking sites during sulfur vulcanization.
As a trade polymer, Royalene 556 EPDM is commonly represented by the polymer CAS 25038-36-2 (Ethylene/Propylene/Diene terpolymer).
There is no single small-molecule molecular formula or single molecular weight for the product because Royalene 556 EPDM is a macromolecule composed of repeating monomer units; regulatory and catalog descriptors therefore list repeat-unit formulas or the polymer name rather than a discrete molecular formula.
For Royalene 556 EPDM class materials, a repeat-unit descriptor such as (C₉H₁₂ · C₃H₆ · C₂H₄)x is often used to indicate composition.
Typical raw-polymer properties for Royalene 556 EPDM from manufacturer/distributor product data are: Mooney viscosity in the low-to-medium range for EPDM extrusion grades (the published data sheet lists a Mooney ML(1+4) at 125 °C around 60 MU), a specific gravity/density near 0.86 g·cm⁻³, low volatile matter (specs commonly cite ≤0.7 wt% volatile), and ENB/diene content formulated to balance fast cure and good cured network properties.
These properties produce a polymer that is highly extendable, with good low-temperature flexibility and a medium molecular weight distribution that balances processability and mechanical performance.
Royalene 556 EPDM contains a non-staining stabilizer.
USES and APPLICATIONS of ROYALENE 556 EPDM:
Applications of Royalene 556 EPDM- Extruded Profiles - Hose - Molded Products.
Royalene 556 EPDM exhibits medium molecular weight distribution, high green strength, excellent shape stability, excellent dispersion and good low temperature properties.
Royalene 556 EPDM offers low die swell and high extrusion rate.
Royalene 556 EPDM is designed for processing by profile extrusion.
Royalene 556 EPDM is used in hoses applications.
Royalene 556 EPDM complies with FDA 21 CFR 177.2600 regulation.
Applications of Royalene 556 EPDM: Extruded Profiles, Hose, and Molded Products.
In practical terms, Royalene 556 EPDM is used for extruded profiles, hoses, molded components and other applications that need long-term weathering, ozone and heat resistance combined with good extrusion performance.
Royalene 556 EPDM's high green strength and shape stability help parts retain dimensional accuracy before curing, and its ENB content supports efficient sulfur vulcanization to yield vulcanizates with useful tensile strength and low compression set for sealing and hose applications.
The grade is also noted for good dispersion of fillers due to its friable bale form and clean mixing behavior.
From a performance/benefits viewpoint, Royalene 556 EPDM offers excellent resistance to ozone, UV and weathering, good long-term aging, reliable low temperature elasticity (typical EPDM Tg around −50 to −40 °C), and compatibility with many common fillers and curatives.
Limitations include poor resistance to non-polar hydrocarbon fuels and many mineral oils — Royalene 556 EPDM is not suited for prolonged contact with gasoline or heavy oils without special formulation.
Royalene 556 EPDM also resists polar fluids (water, steam, many detergents and glycol brake fluids), which is why it is widely used in automotive and HVAC sealing systems.
Safety and handling for Royalene 556 EPDM follow standard polymer practice: the material is a relatively inert solid and supplier SDSs for Royalene grades indicate the product is not classified as acutely hazardous under normal exposure conditions, but dust control and good industrial hygiene are recommended.
UNIQUE FEATURES of ROYALENE 556 EPDM:
- Excellent extrusion properties: low die swell, high extrusion rate
- High green strength, excellent shape stability
- Friable bale provides excellent dispersion
- Highly extendable
- Good low temperature properties
PHYSICAL and CHEMICAL PROPERTIES of ROYALENE 556 EPDM:
Polymer Type: EPDM (Ethylene-Propylene-Diene Monomer) terpolymer.
Physical Form / Color: Off-white solid, supplied in “friable bale” form (~ 25 kg / 55.1 lb per bale).
Mooney Viscosity (uncured, milled): Between 55 – 65 ML (1+4) / 125 °C (per company test method)
Ethylene / Propylene Weight Ratio (E/P): ~ 71 / 29 (w/w) for this grade.
Diene Content (ENB): ~ 4.5 wt% ethylidene norbornene (ENB) per TDS.
Molecular Weight Distribution: Medium.
Volatile Matter: ≤ 1.0 wt% (maximum spec) in raw polymer.
Stabilizer: Non-staining stabilizer (so the polymer does not discolor or leave marks).
Specific Gravity / Density: ~ 0.87 g/cm³ (ASTM D-792) for the raw polymer.
CAS number: 25038-36-2 (typical for ethylene/propylene/diene terpolymers used for EPDM trade grades).
EC / EINECS number: 500‑039‑8 for ethylene/propylene/diene terpolymer class
Molecular Formula: EPDM is a polymer, so there is no single small-molecule formula. The repeat-unit formula can be described as (C₂H₄)x-(C₃H₆)y-(C₉H₁₂)z, where x/y/z reflect the ethylene, propylene, and ENB diene content.
Molecular Weight: As a polymer, there is no single molecular weight. Molecular weight varies by batch and is usually expressed as number-average (Mn) or weight-average (Mw) in the range typical for medium-MW EPDM, often around 100,000–300,000 g/mol depending on grade and polymerization
FIRST AID MEASURES of ROYALENE 556 EPDM:
-Description of first-aid measures
*General advice:
Show this material safety data sheet to the doctor in attendance.
*If inhaled:
After inhalation:
Fresh air.
*In case of skin contact:
Take off immediately all contaminated clothing.
Rinse skin with
water/ shower.
*In case of eye contact:
After eye contact:
Rinse out with plenty of water.
Call in ophthalmologist.
Remove contact lenses.
*If swallowed:
After swallowing:
Immediately make victim drink water (two glasses at most).
Consult a physician.
-Indication of any immediate medical attention and special treatment needed.
No data available
ACCIDENTAL RELEASE MEASURES of ROYALENE 556 EPDM:
-Environmental precautions:
Do not let product enter drains.
-Methods and materials for containment and cleaning up:
Cover drains.
Collect, bind, and pump off spills.
Observe possible material restrictions.
Take up dry.
Dispose of properly.
Clean up affected area.
FIRE FIGHTING MEASURES of ROYALENE 556 EPDM:
-Extinguishing media:
*Suitable extinguishing media:
Carbon dioxide (CO2)
Foam
Dry powder
*Unsuitable extinguishing media:
For this substance/mixture no limitations of extinguishing agents are given.
-Further information:
Prevent fire extinguishing water from contaminating surface water or the ground water system.
EXPOSURE CONTROLS/PERSONAL PROTECTION of ROYALENE 556 EPDM:
-Control parameters:
--Ingredients with workplace control parameters:
-Exposure controls:
--Personal protective equipment:
*Eye/face protection:
Use equipment for eye protection.
Safety glasses
*Body Protection:
protective clothing
*Respiratory protection:
Recommended Filter type: Filter A
-Control of environmental exposure:
Do not let product enter drains.
HANDLING and STORAGE of ROYALENE 556 EPDM:
-Conditions for safe storage, including any incompatibilities:
*Storage conditions:
Tightly closed.
Dry.
STABILITY and REACTIVITY of ROYALENE 556 EPDM:
-Chemical stability:
The product is chemically stable under standard ambient conditions (room temperature).
-Possibility of hazardous reactions:
No data available
