PRODUCTS

BAYFERROX 4920

Bayferrox 4920 is used Fertilizers, Fibre Cement, Floorings, Foundry, Foundry Sands, In Situ Concrete, Industrial Coating, and Laminate.
Bayferrox 4920 is used Masterbatches, Mortar, Noise Barriers, Paints & Coatings, Paper Manufacture, Paper industry, Paving Stones and Plaster.
Bayferrox 4920 is used Plastic- and Rubberpolymers, Plastic Coating, Plastic products, Powder Coating, Roofing Felts, Roof tile Coating, Sand-lime Bricks and Screed.

CAS Number: 51274-00-1
EC number: 257-098-5
Chemical class: Synthetic iron hydroxide ※ - FeOOH
Chemical Formula: FeOOH (iron(III) oxide-hydroxide)
Molecular Weight: approximately 89 g/mol

SYNONYMS:
Iron Oxide Yellow 4920, Pigment Yellow 42, C.I. 77492, Iron Hydroxide Oxide Yellow, C.I. Pigment Yellow 42, Iron Oxide Orange Transparent 188VN, Iron Oxide Yellow Transp. 088VN, Mapico Yellow LL-XLO, Mapico Yellow 5, Iron Oxide Yellow 420, Iron Yellow, Iron oxide yellow, Yellow iron oxide, Pure Yellow Oxide YO 6087, Mapico Yellow 1050, Zh 1, Cosmetic Yellow, Ariabel Yellow 300407, Iron hydroxide oxide yellow, Bayferrox 420, Pigment Yellow 42, L 1 (pigment), L 1, Toda Color Y 2, Sicotrans Yellow L 1915, Sicotrans Yellow L 1916, Synthetic yellow iron oxide pigment, Cappoxyt Yellow 4214, Cappoxyt Yellow 4214C, Sicoflush L Yellow 1916, Bayferrox 3950, Iron Oxide Yellow 214501, Bayferrox 920, Iron Yellow AZ 138, AZ 138, LL-XLO, Toda Color Yellow 48, Disperse HG 457, Sicotrans Gold L 1916, EC 481, Bayferrox 915, Bayferrox 3920, Bayferrox Yellow 420, YO 2087, Zh 1 (pigment), PW 895, Bayferrox 930, Bayferrox Yellow 3910, Bayferrox Yellow 415, Bayferrox 415, Oxide Yellow 3910, Bayferrox 3910, YB 3100, Yellow YB 3100, Sicovit Yellow 10, C.I. 77492, Mapico Yellow Lemon, Goethite yellow, Sicovit Yellow 10E172, Toda Yellow 48, Tarox Lemon, Tarox Yellow Lemon, Unisperse Yellow Oxide M-S, L 1916, Sicotrans Yellow L 1918, L 1918, Sicoflush L Yellow 1916C4, Luconyl Yellow 1916, LB 100E172, Y 200M, Xfast Yellow 1916, Unipure LC 182, Bayferrox Yellow 920, Burnt Sienna TY, YZ 1688, Sicoflush P Yellow 1916, Dittany Y 77492, PY 42, Timbasol PW 895, Kobo Yellow WSJ 20EYAMP, GA 7311, C 7055, Syn-Ox HTR 810, Syn-Ox HTR 820, LL 100PD, Bayferrox Yellow 3920, Tarox TRY 100, SunCROMA Yellow Iron Oxide, S 313, Iron Oxide Yellow 301, Iron Oxide Yellow 311, CWD 8942, Trans Oxide Yellow AC 2544, AC 2544, Bayferrox 3960, R 131CN, CM 3FA70ERH, CM 3F30TRY, R 2087, Y 10M, SunPURO Yellow, Unipure Yellow LC 181, YellowCap 1, Unipure Yellow LC 182, S 920, S 920 (pigment), Unipure Yellow LC 182EM, E 172 Yellow, Bayferrox Yellow 4920, Sicopharm Yellow, Iron Oxide Yellow 313, Tarox YP 1200P, TY 618, G 313M, G 131M, Yellow YP 1200P, YP 1200P, YL 01888D, Chromaflo 888-1810, Bayferrox Yellow 3905, Bayferrox 3905, Puricolor Yellow PYE 42, FZ 1000, 362R, Anchor FY 766, CTD 7201, Iron Yellow S 313, HP 6042, Xeracolor Yellow Oxide, Xeracolour Yellow Oxide, SunPuro Yellow C 33-9001, Ferric oxide, yellow, EMF Color Ochre HL, PS 86 1347, Sicotrans Gelb L 1915, Bayferrox 920C, Bayferrox Ochre 920C, TANOP 100, SZ 7499, GEH 102, S 920M, WD-TIOY 30E, S 960, S 960 (pigment), Cappoxyt 4214X, Cappoxyt Yellow 4214X, Bayferrox 4905, CI 77492 yellow, Creasperse Yellow CP 080, Ecosperse Oxide Yellow RA 100CN, Yellow Bayferrox 3920, WS-Y 042, Iron Yellow 313, Y 1003, YLO 1888D, YP 75FL, Cameleon Yellow, Bayferrox 4910, YLO 3288D, Bayferrox 4960, Bayferrox 3290, MF 5050 Yellow, Transparent Yellow Oxide 1852, R 132CN, Colanyl Oxide Yellow R 132CN, Colanyl R 132CN, Bayferrox Yellow L 3920, KH 70401, NX 512 Yellow, BTY 101W, Tarox LL 100HP, LL 100HP, G 313, Colortherm Yellow 20, SM 8810, Bayferrox, C.I. 77492, C.I. Pigment Yellow 42, CathayCoat Yellow, CathayCoat Yellow Iron Oxide, CathayPure Yellow, CathayPure Yellow Iron oxide, Colortherm, FerroTint Yellow, FerroTint Yellow Iron Oxide, Ferroxon Yellow, GEH, Iron oxide yellow, Iron(III)oxide hydroxide, Lavanya Sooraj / Yellow Iron Oxide, Piirox GC913, Piirox® A920, Piirox® I913, Piirox® K910M, Spectrum Yellow, Spectrum Yellow Iron Oxide, Sumicos Yellow 2213C, TAROX IRON OXIDE LEMON, TAROX IRON OXIDE LL-100DK, TAROX IRON OXIDE LL-100HP, TAROX IRON OXIDE LL-100P, TAROX IRON OXIDE LL-50, TAROX IRON OXIDE LL-XLO, TAROX IRON OXIDE OCHER 1P, TAROX IRON OXIDE STN-1, TAROX IRON OXIDE YM1100, Yellow Pigment G-2, Yellow iron oxide, Yellow iron oxide 313, Yellow pigment G-1, iron hydroxide oxide, iron hydroxide oxide yellow, ossido di ferro giallo, ossido di ferro giallo sintetico, synthetic yellow iron oxide, Pigment Yellow 42, C.I. 77492, Iron oxide yellow, Ferric oxide yellow, Iron(III) oxide monohydrate, Iron hydroxide oxide, Iron(III) oxide-hydroxide yellow, Alpha iron oxide (hydrated), Yellow iron oxide, FeOOH synthetic pigment, iron(3+) hydroxide oxidandiide, iron(III) hydroxide oxide

Bayferrox 4920 is an iron hydroxide yellow pigment.
Bayferrox 4920 is an inorganic pigment.
Bayferrox 4920 is an iron oxide yellow pigment.

Bayferrox 4920 is delivered as powder and can be applied for the coloration of a wide variety from construction materials, paint & coating, plastics to paper etc.
Bayferrox 4920 is a synthetic iron oxide inorganic pigment with a color index of Pigment Yellow 42.

Bayferrox 4920 has a goethite structure and its pigment characteristics include excellent light and weather resistance, good tinting strength, and color consistency.
Compared with Bayerox 4910 , Bayferrox 4920's hue is darker and redder.

Bayferrox 4920 is a high-performance synthetic yellow iron oxide pigment designed for applications where long-term color stability and resistance to environmental stress are essential.
Unlike organic yellow pigments, which may fade or degrade under ultraviolet radiation, Bayferrox 4920 derives its durability from its inorganic goethite (α-FeOOH) crystal structure.

This crystalline arrangement provides inherent resistance to light, weathering, chemicals, and heat, making Bayferrox 4920 particularly suitable for outdoor and high-exposure environments.
From a regulatory and environmental standpoint, Bayferrox 4920 is generally regarded as a low-risk inorganic pigment when handled correctly.

Bayferrox 4920 is not volatile, does not emit hazardous vapors, and is not classified as flammable.
Because iron oxides occur naturally in the environment, synthetic iron oxide pigments are often viewed as environmentally compatible when used responsibly.

Bayferrox 4920 is a synthetic iron oxide alpha FeOOH with the color index PY 42 (yellow).
Bayferrox 4920 has a goethite structure and its pigment characteristics are outstanding lightfastness, tinting strength, color consistency, and weather stability.

Bayferrox 4920 is darker and somewhat redder compared to Bayferrox 4910.
Bayferrox 4920 is an iron oxide yellow pigment.

USES and APPLICATIONS of BAYFERROX 4920:
In terms of aesthetic performance, Bayferrox 4920 delivers a clean, warm yellow hue that can be blended easily with red, brown, or black iron oxides to create a wide palette of earth-tone shades.
This makes Bayferrox 4920 especially valuable in architectural design, where natural and mineral-like colors are preferred.
Bayferrox 4920's consistent batch-to-batch quality ensures reproducible color results, which is critical for large-scale industrial and construction projects.

Overall, Bayferrox 4920 combines color reliability, processing efficiency, and long-term durability, making it a preferred choice in industries where performance over decades is more important than short-term visual impact.
Bayferrox 4920's inorganic nature, proven stability, and broad application compatibility distinguish it from less durable pigment alternatives.

Bayferrox 4920 is delivered as powder and can be applied for the coloration of a wide variety from construction materials, paint & coating, plastics to paper etc.
Applications of Bayferrox 4920: Agriculture, Artificial Turf, Asphalt, Automotive Coating, Ceramic, Ceramic Stains, Coil Coating, and Colored Plastics.

Bayferrox 4920 appears as a yellow powder and is widely used in automotive coatings, ceramic glazes, coil coatings, colored plastics, concrete bricks, concrete roofing tiles, building materials, anti-corrosion coatings, decorative coatings, latex paints, fiber cement boards, fertilizers, floor coatings, on-site concrete, industrial coatings, laminates, masterbatches, mortars, the paper industry, soundproof walls, pebbles, gypsum, plastics and rubber polymers, plastic coatings, plastic products, powder coatings, sand-lime bricks, wood coatings, and wood-plastic composites.

From a formulation perspective, Bayferrox 4920 offers excellent dispersibility in a wide range of binder systems.
In coatings and plastics, Bayferrox 4920 can be incorporated efficiently using standard dispersion equipment, minimizing energy consumption during processing.

Bayferrox 4920's particle morphology contributes to uniform color development and helps prevent issues such as streaking, flocculation, or uneven coloration, even in thick or highly filled systems such as construction materials.
In construction applications, especially colored concrete, paving stones, roof tiles, and precast elements, Bayferrox 4920 is valued for its cement compatibility.

Bayferrox 4920 does not interfere with cement hydration and maintains stable color tones even in highly alkaline environments.
This property ensures consistent appearance over time, even when exposed to rain, frost, or strong sunlight.
Bayferrox 4920’s insolubility in water prevents bleeding, leaching, or migration within cementitious matrices.

Thermally, Bayferrox 4920 demonstrates good heat stability for typical processing conditions in plastics and coatings.
While hydrated iron oxide pigments may gradually transform at very high temperatures, Bayferrox 4920 remains color-stable within the temperature ranges normally encountered during extrusion, injection molding, or curing of coatings.

This allows Bayferrox 4920's use in polymers such as PVC, polyethylene, polypropylene, and rubber compounds without significant color loss or shift.
Another important characteristic of Bayferrox 4920 is its chemical inertness.

Bayferrox 4920 is resistant to weak acids, alkalis, and most solvents, which allows it to be used in chemically demanding environments, including industrial coatings and aggressive outdoor conditions.
This inert behavior also reduces the risk of unwanted chemical reactions with formulation components, improving shelf life and long-term performance of finished products.

Bayferrox 4920 is used for Concrete Masonry Blocks, Concrete Roofing Tiles, Construction, Construction material, Corrosion Protection, Decorative Paints, Emulsion Paints and Facade Elements.
Bayferrox 4920 is used Fertilizers, Fibre Cement, Floorings, Foundry, Foundry Sands, In Situ Concrete, Industrial Coating, and Laminate.

Bayferrox 4920 is used Masterbatches, Mortar, Noise Barriers, Paints & Coatings, Paper Manufacture, Paper industry, Paving Stones and Plaster.
Bayferrox 4920 is used Plastic- and Rubberpolymers, Plastic Coating, Plastic products, Powder Coating, Roofing Felts, Roof tile Coating, Sand-lime Bricks and Screed.

Bayferrox 4920 is delivered as powder and can be applied for automotive coating, coil coating, decorative paints, emulsion paints, industrial coating, plastic coating, powder coating, roof tile coating and wood coating.
Bayferrox 4920 is delivered as powder and can be applied for the coloration of a wide variety from construction materials, paint & coating, plastics to paper etc.

Bayferrox 4920 is used in Concrete Masonry Blocks, Concrete Roofing Tiles, Construction, Construction material, Corrosion Protection, Decorative Paints, Emulsion Paints, and Facade Elements.
Bayferrox 4920 is used in fertilizers, Fibre Cement, Floorings, Foundry, Foundry Sands, In Situ Concrete, Industrial Coating, and Laminate.

Bayferrox 4920 is delivered as powder and can be applied for the coloration of a wide variety of construction materials.
Bayferrox 4920 is used in Concrete Roofing Tiles, Fibre Cement, Noise Barriers, Laminate, Wood Coating, Sand-lime Bricks, Paper Manufacture, Decorative Paints, Plastic products, and Corrosion Protection.

Bayferrox 4920 is used Wood Plastic Composites, Screed, Roof tile Coating, Architectural coatings, Industrial Coating, Concrete Masonry Blocks, Plastic Coating, Emulsion Paints, Automotive Coating, Construction material, Plaster, Floorings, and Industrial Paints.
Bayferrox 4920 is used Facade Elements, Colored Plastics, In Situ Concrete, Paving Stones, Masterbatches, Fertilizers, and Mortar.

Bayferrox 4920 is widely used as a high-quality yellow pigment in: Coatings, Architectural & decorative paints, Industrial coatings, Automotive coatings, Coil coatings, and Wood coatings.
Bayferrox 4920 is used Plastics & Polymers, Plastic pigments, Colored masterbatches, and Rubber polymer coloration.

Bayferrox 4920 is used Construction Materials, Concrete bricks / blocks, Roof tiles, Flooring / screed, Mortar / plaster, and Noise barrier panels.
Other Applications of Bayferrox 4920: Paper manufacturing, and Fertilizers / composite materials

Bayferrox 4920 is used wherever durable, weather-resistant yellow coloration is needed.
Bayferrox 4920 is delivered as powder and can be applied for the coloration of a wide variety of construction materials.

KEY BENEFITS & CHARACTERISTICS of BAYFERROX 4920:
*High lightfastness & weather resistance — durable colours outdoor and indoor.
*Strong tinting strength — good colour performance with lower dosage.
*Chemical stability — compatible with many coating and polymer systems.
*Inorganic pigment advantages: non-fading, UV-stable, non-flammable.

CHARACTERISTICS of BAYFERROX 4920:
*Powder form for easy dispersion.
*Insensitive to most solvents.
*Low moisture and impurities — high purity product.

INDUSTRIES of BAYFERROX 4920:
*Automotive and Transportation
*Electrical and Electronics
*Consumer Goods
*Building and Construction
*Paints and Coatings

CHEMICAL CHARACTERISTICS of BAYFERROX 4920:
Bayferrox 4920 is inorganic pigment based on iron(III) oxide-hydroxide.
Goethite type structure — this gives durable yellow colour and weather resistance.
Bayferrox 4920 is insoluble in water and most solvents.

PHYSICAL and CHEMICAL PROPERTIES of BAYFERROX 4920:
Boiling Point: N/A
PSA: 0.00000
XLogP3: 0.00000
Appearance: pieces
Density: 5.24
Melting Point: 1538 °C
Flash Point: >230°F
APPEARANCE: DARK YELLOW POWDER
CONTENT OF Fe2O3: 86% min
pH VALUE: 3-7
SHADE: CLOSE TO STANDARD
OIL ABSORPTION: 25-35%

density: 4.0g/ml
Melting point: 1538 °C
RESIDUE ON 320 MESH: 0.3% max
WATER SOLUBLE: 0.3% max
VOLATITE: 105 °C 1.0% max
TINTING STRENGTH: 98-102 %
Type: Yellow Inorganic Pigment
Chemical Grade: Synthetic Iron Oxide A-FE OOH
Index: Pigment Yellow 42(77492)
CAS Code: 51274-00-1
REACH registration number: 01-2119457554-33

Appearance: Iron yellow powder
Type: Yellow pigment
Delivery form: Powder
Chemical class: Synthetic iron hydroxide ※ - FeOOH
Colour Index: Pigment yellow 42 (77492)
CAS Number: 51274-00-1
REACH registration no: 01-2119457554-33-0000
Product Type: Color Pigments
Color: Yellow
Delivery Form: Powder
Molar weight: 89
Color Index: 77492.0000

REACH: 01-2119457554-33
CAS (CAS Number): 51274-00-1
CAS-Number: 51274-00-1
APPEARANCE: Yellow
MELTING POINT: 1565 °C
TYPES: Non-Micronised
water soluble salt: <0.5%
Screen residue (0.045mm screen mesh): 0.05%
pH value: 4.0-7.0
α-FeOOH content: >99.1%
Loss after calcination at 1000 degrees Celsius for half an hour: <15%

Humidity (after processing): <1.0%
particle shape: Rod-shaped
Main particle size: 0.1-0.8µm
Oil absorption: 32g/100g
compacted density: 0.4g/ml
Density: 5.24
Flash point: >230 °F
storage temp.: Room Temperature
form: Powder
color: yellow
Water Solubility: 1.65μg/L

Melting Point: 1538°C
Flash Point: >230°F
Density: 5.24
Appearance: pieces
Hazard Statements: Xi
Density: 5.24 g/cm3
PSA: N/A
LogP: N/A
Solubility: 1.65μg/L
Melting Point: 1538 °C
Formula: Fe2O3.H2O

Product Name: BAYFERROX® 4920
CAS Number: 51274-00-1
EC / EINECS Number: 257-098-5
REACH Registration Number: 01-2119457554-33-0000
Colour Index Name/Number: Pigment Yellow 42 (C.I. 77492)
Chemical Class: Synthetic iron oxide (α-FeOOH, iron(III) oxide-hydroxide)
IUPAC Name: Iron(III) oxide monohydrate or iron hydroxide oxide yellow
Molecular Formula (pigment base): Fe₂O₃·H₂O (approx.)
Molar Mass (approx): ~177.7 g/mol
Form / Appearance: Fine yellow powder.
Colour: Yellow pigment.

Chemical Structure / Composition: Synthetic iron hydroxide/iron oxide (Fe₂O₃·H₂O).
Density: ~4.0 g/cm³ (bulk product level value)
Apparent density (tapped): ~0.4 g/ml
pH: Typically around 4.0-7.0 (aqueous dispersion)
Particle Size: ~0.1–0.8 μm (rod-shaped particles)
Moisture Content: <1.0% after processing
Water-Soluble Salts: <0.5%
Oil Absorption: ~30-45 g/100 g pigment
Heat Resistance: Up to ~180 °C good for coatings/plastics before significant changes
Light & Weathering Resistance: High (lightfastness level ~8, long weather-resistance)

FIRST AID MEASURES of BAYFERROX 4920:
-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 BAYFERROX 4920:
-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 BAYFERROX 4920:
-Extinguishing media:
*Suitable extinguishing media:
Water
Foam
Carbon dioxide (CO2)
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 BAYFERROX 4920:
-Control parameters:
--Ingredients with workplace control parameters:
-Exposure controls:
--Personal protective equipment:
*Eye/face protection:
Use equipment for eye protection.
Safety glasses
*Skin protection:
Full contact:
Material: Nitrile rubber
Minimum layer thickness: 0,11 mm
Break through time: 480 min
Splash contact:
Material: Nitrile rubber
Minimum layer thickness: 0,11 mm
Break through time: 480 min
*Body Protection:
protective clothing
*Respiratory protection:
Recommended Filter type: Filter type P2
-Control of environmental exposure:
Do not let product enter drains.

HANDLING and STORAGE of BAYFERROX 4920:
-Conditions for safe storage, including any incompatibilities:
*Storage conditions:
Tightly closed.
Dry.

STABILITY and REACTIVITY of BAYFERROX 4920:
-Chemical stability:
The product is chemically stable under standard ambient conditions (room temperature) .
-Incompatible materials:
No data available