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    Related: Inorganic Pigment Titanium Dioxide Zinc Oxide
    • Ferric Oxide (Red Iron Oxide) CAS 1309-37-1
    • Ferric Oxide (Red Iron Oxide) CAS 1309-37-1

    Ferric Oxide (Red Iron Oxide) CAS 1309-37-1

    Ferric Oxide, also called red iron oxide or iron(III) oxide, CAS 1309-37-1, is a stable red pigment supplied for pigment, electronic and pharmaceutical applications. Confirm the required grade and specification, then request a quotation with COA/TDS/SDS for bulk supply.

    • CAS: 1309-37-1
    • Synonyms: Iron(III) oxide, Iron oxide, Ferric oxide red, Red iron oxide, Ferric sesquioxide
    • Einecs: 215-168-2
    • Molecular Formula: Fe₂O₃
    • Grade: Pigment Grade, Electronic Grade, Pharmaceutical/Cosmetic Grade.
    • Package: 25kg Multi-ply Paper Bag (with PE liner) or 1000kg Bulk Bag on Pallet.
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    Product Description

    Ferric Oxide CAS 1309-37-1 is iron(III) oxide, also known as red iron oxide, with molecular formula Fe2O3, molecular weight about 159.69 and EINECS 215-168-2.

    Synonyms: Iron(III) oxide; Iron oxide; Ferric oxide red; Red iron oxide; Ferric sesquioxide.

    CAS: 1309-37-1.

    It has the molecular formula Fe2O3 and a molecular weight of about 159.69 g/mol.

    It appears as a red to reddish-brown powder.

    A standard 130-type red iron oxide usually has Fe2O3 content of at least 96%, moisture of at most 1.0% and pH around 3–7.

    Red iron oxide, iron(III) oxide, ferric oxide red and CI Pigment Red 101 (CI 77491) refer to the same red iron oxide colorant.

    Pigment grade is optimized for color performance in paints, coatings, concrete and plastics.

    Electronic grade has tighter control for electronic applications.

    Pharmaceutical and cosmetic grades are purified for use in color cosmetics and medicines.

    It is widely used to color construction materials, paints, coatings, ceramics, plastics and rubber.

    Purified grades are also used in color cosmetics and selected pharmaceutical applications.

    Store in a cool, dry, well-ventilated area in tightly closed containers to prevent moisture pickup.

    Protect from moisture and direct sunlight.

    Confirm appearance, Fe2O3 content, moisture, pH, oil absorption and particle size as required.

    Use dust masks or respirators and eye protection during handling, and wash skin contact with soap and water.

    Confirm packaging with the requested quantity and destination requirements.

    The page is an RFQ entry point and does not state stock, price, MOQ or fixed lead time.

    For an RFQ, state the intended use, required grade and specification, quantity, packaging, destination and document needs.

    FAQ - Technical & Supply Chain

    • Q:

      What is Ferric Oxide Red CAS 1309-37-1?

      A: Ferric Oxide Red is iron(III) oxide, with the molecular formula Fe2O3 and molecular weight about 159.69 g/mol. It is a stable red to dark red inorganic pigment with high opacity, tinting strength, and resistance to light, alkali, and mild acid.
    • Q:

      Are red iron oxide, iron(III) oxide, and CI Pigment Red 101 the same material?

      A: Yes. Red iron oxide, iron(III) oxide, ferric oxide red, and CI Pigment Red 101/CI 77491 all refer to the same red iron oxide colorant under CAS 1309-37-1. In food and pharmaceutical colorant contexts, purified red iron oxide is also known as E172.
    • Q:

      What is the difference between pigment grade, electronic grade, and pharmaceutical or cosmetic grade red iron oxide?

      A: Pigment grade is optimized for color performance in paints, coatings, concrete, and plastics. Electronic grade has tighter control of particle size, purity, and magnetic or conductive behavior, while pharmaceutical and cosmetic grades are purified to meet stricter heavy metal and microbial limits for skin, tablet coatings, or food-contact uses.
    • Q:

      What are the typical specifications for Ferric Oxide Red 130 pigment?

      A: A standard 130-type red iron oxide usually has Fe2O3 content of at least 96%, moisture no more than 1.0%, pH around 3-7, and oil absorption of 15-25 g/100g. It also has low water-soluble salts and 325-mesh residue for good dispersion.
    • Q:

      What are the main applications of Ferric Oxide CAS 1309-37-1?

      A: It is widely used to color construction materials, paints, coatings, ceramics, plastics, and rubber. Purified grades are also used in cosmetics, pharmaceutical tablet coatings, and as E172 food colorant, while electronic grades may be used in magnetic or electronic materials.

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