Product identity
- Chemical name
- Iron oxide hydroxide, FeO(OH)
- Colour Index
- C.I. Pigment Yellow 42
- CAS number
- 51274-00-1
- HS code
- 2821.10
- Packaging
- 25 kg bag · 1,000 kg bulk bag
- Availability
- Ex-warehouse GTA
Iron oxide pigment
Synthetic Yellow Iron Oxide
Synthetic yellow iron oxide hydroxide, supplied in a standard grade for cementitious and dry-mix systems and in a jet-milled micronized grade for coatings and inks. Yellow is most often used in blend with red and black to reach buff, tan and sandstone shades.
Thermal limit. Yellow iron oxide dehydrates to red iron oxide on sustained heating above roughly 150–180 °C. It is not suitable for autoclaved products, high-temperature extrusion or any process that holds the pigment above that range. Confirm the peak process temperature before specifying yellow.
Grades supplied
| Yellow 920 | Standard | Standard |
| Yellow 920M | Micronized, jet-milled | Micronized |
Typical properties
| Property | Value | Method |
|---|---|---|
| Purity, as Fe₂O₃ | ≥ 86.0 % | ISO 1248 |
| Tinting strength | 95–105 % of standard | ISO 787-16 |
| pH, aqueous suspension | 3.0–7.0 | ISO 787-9 |
| Moisture, 105 °C | ≤ 1.0 % | ISO 787-2 |
| Residue, 325 mesh (45 µm) | ≤ 2.0 % — standard grade | ISO 787-18 |
| Dispersion fineness | ≥ Hegman 6.0 — 920M | ASTM D1210 |
| Oil absorption | 25–35 g/100 g | ISO 787-5 |
Standard grades
- Mortar, grout and dry-mix
- Precast and architectural concrete
- Pavers and blended shades
Micronized grades
- Coatings and primers
- Printing inks
- Plastics and masterbatch
Values are typical and are confirmed on the certificate of analysis supplied with each lot. They do not constitute a specification unless agreed in writing.