Ferric Oxide Red (Iron Oxide Red)
CAS Number: 1309-37-1
Pharmaceutical grade Ferric Oxide Red (Iron Oxide Red, E172) is an inorganic iron oxide pigment used as a colorant in tablet coatings, capsule shells, and pharmaceutical preparations. It provides stable, light-fast red-brown coloration and is insoluble in water, ensuring color consistency throughout the shelf life. It is also used in cosmetics and food products.
Technical Specifications
| appearance | Red to reddish-brown powder |
| lead (ppm) | ≤10 |
| arsenic (ppm) | ≤3 |
| mercury (ppm) | ≤1 |
| loss on drying (%) | ≤1.5 |
| assay (as Fe2O3, %) | ≥97.0 |
Applications
- Tablet coating colorant
- Hard gelatin and HPMC capsule shell colorant
- Film coating pigment
- Cosmetic pigment
- Food coloring (E172)
Key Features
- Excellent light and heat stability
- Water-insoluble for consistent color
- Non-toxic inorganic pigment
- USP/NF, EP, E172 compliant
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CAS Number
1309-37-1
Category
Pharmaceutical ExcipientsAvailability
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