Iron Oxide Red
Broad Chromatic Spectrum: Iron oxide pigments provide an extensive color palette encompassing yellow, red, brown, and black variants to accommodate diverse application requirements.
Synthetic Purity Assurance: Through controlled synthesis processes, these pigments guarantee batch-to-batch consistency and precise chemical composition.
Minimal Trace Metal Content: Food-grade iron oxides are manufactured with stringent control over metallic impurities, ensuring suitability for sensitive applications.
Multi-Industry Versatility: The availability of both anhydrous and hydrated forms enables tailored solutions for regulated food products, cosmetic formulations, and specialized industrial coatings.
Iron oxide pigments are produced through controlled synthesis methods and consist predominantly of anhydrous or hydrated iron compounds. These pigments offer a comprehensive color spectrum including yellow, red, brown, and black shades. Food-grade iron oxides are specifically distinguished from technical-grade variants by their stringent limits on heavy metal content and minimal impurities, ensuring compliance with food safety regulations for sensitive applications.
Ferric oxide Chemical Properties
Melting point | 1538°C |
Density | 5.24 |
Fp | >230 °F |
Storage temp | 2-8°C |
Solubility | It is soluble In Warm Hydrochloric Acid, Slightly Soluble in Sulfuric Acid. |
Form | Pieces |
Color | Black |
Specific Gravity | 5.1～5.2 |
PH | 3.7±0.3 |
Water Solubility | INSOLUBLE |
Crystal Structure | Corundum type |
Crystal system | Three sides |
Merck | 14,4028 |
Space group | R3c |
Lattice constant | a/nmb/nmc/nmα/oβ/oγ/oV/nm30.502590.502591.373590901200.3005 |
Exposure limits | ACGIH: TWA 5 mg/m3 |
Stability | Stable. |
CAS DataBase Reference | 1309-37-1(CAS DataBase Reference) |
NIST Chemistry Reference | Iron(iii) oxide(1309-37-1) |
IARC | 3 (Vol. 1, Sup 7) 1987 |
EPA Substance Registry System | Ferric oxide (1309-37-1) |
Safety Information
Hazard Codes | Xi |
Risk Statements | 36/37/38 |
Safety Statements | 26 |
OEB | B |
OEL | TWA: 5 mg/m3 |
WGK Germany | - |
RTECS | NO7400000 |
TSCA | Yes |
HS Code | 28211000 |
Hazardous Substances Data | 1309-37-1(Hazardous Substances Data) |
IDLA | 2,500 mg Fe/m3 |
Red iron oxide (Fe₂O₃) is an inorganic red pigment existing in both natural and synthetic forms. This pigment exhibits a low-chroma red hue with exceptional durability and cost-effectiveness. The synthetic variant is typically produced through thermal decomposition of iron sulfate with calcium oxide in kilns, or alternatively via high-temperature calcination of iron sulfate under oxidative atmosphere. Natural iron oxides are principally sourced from mineral deposits such as hematite (Fe₂O₃) and its hydrated derivatives.
