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SDI Red IO AS

Advanced Hydrophobic Red Iron Oxide for Long-Wear Cosmetics

INCI Name: Iron Oxides (CI 77491), Triethoxycaprylylsilane

Achieve long-lasting, true red shades with SDI Red IO AS, a high-purity matte iron oxide pigment. Surface-treated with Triethoxycaprylylsilane, this hydrophobic pigment offers excellent skin affinity, enhanced oil dispersibility, and a smooth feel. It is the ideal choice for creating high-performance foundations, lipsticks, and pressed powders with a stable, vibrant, and long-wearing matte finish.

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Perfect For These Applications

Other cosmetic uses possible—contact us for formulation guidance.

Long-Wear Liquid & Cream Foundations
Delivers a stable, hydrophobic barrier that enhances wear-time and prevents color shifting in liquid and cream emulsions.
Matte Liquid Lipsticks & Lip Liners
Provides excellent adhesion and a non-drying matte finish, ensuring rich, transfer-resistant lip color.
Pressed Powder Foundations & Blushes
Improves press-ability and skin affinity, resulting in a smooth, blendable powder with a soft, natural matte look.
Anhydrous Hot Pour Concealers & Stick Foundations
Ensures excellent dispersibility in oil and wax bases for uniform color and a creamy, comfortable feel on the skin.
Waterproof Mascaras & Eyeliners
Creates a hydrophobic film that repels moisture, providing smudge-proof and long-lasting performance for eye makeup.
Natural Finish Nail Lacquers
Offers stable suspension and a classic, opaque matte red finish in solvent-based nail polish formulations.

Technical Profile: The Advantage of AS Surface Treatment

Transforming Performance with Triethoxycaprylylsilane

SDI Red IO AS is a high-purity iron oxide (CI 77491) surface-treated with Triethoxycaprylylsilane (AS). This advanced hydrophobic coating converts the pigment from water-loving to water-repelling, greatly improving compatibility with oils, silicones, and esters commonly used in long-wear cosmetics. The result is a pigment that disperses effortlessly, offers superior adhesion, feels smoother on the skin, and maintains color integrity over time.

Formulation Benefits for High-Performance Cosmetics

In liquid foundations and lipsticks, the AS treatment minimizes agglomeration and settling for improved stability and a more even laydown. In pressed powders, it enhances binding and skin affinity, delivering a second-skin, fade-resistant matte finish. This technology enables sophisticated, long-wearing products with intense, true-red color and a comfortable feel—without added fillers or texturizers.

Key Formulation Benefits

  • Enhanced Wear-Time: Hydrophobic surface improves resistance to water, sweat, and sebum for extended longevity.
  • Improved Skin Feel: Silane treatment imparts a smooth, creamy texture, avoiding the dry, chalky feel of untreated matte pigments.
  • Superior Dispersibility: Easily disperses in oils and silicones, simplifying processing and ensuring homogenous, streak-free color.
  • True Matte Finish: Delivers a pure, opaque matte effect without additional texturizing fillers, supporting clean, streamlined formulas.
Heading #1
Line/Series
SDI
INCI Name
Iron Oxides (CI 77491), Triethoxycaprylylsilane
Physical Product Color
Red
Color Effect
Red
Effect Type
Matte
Material Type
Powder, Pure Pigments
Certifications
TiO2 Free, Vegan & Cruelty Free
Particle Size
1-1.5 μm
Applications
Eye, Face, Lip, Nail

Frequently Asked Questions About SDI Red IO AS

The AS treatment makes the iron oxide pigment hydrophobic (water-repelling), which improves its adhesion to skin, enhances long-wear properties, provides a smoother feel, and makes it easier to disperse in oils and silicones.
Yes, SDI Red IO AS is a mineral-based pigment that is both vegan and cruelty-free. It is also formulated without titanium dioxide, aligning with many clean beauty standards.
This pigment has a fine particle size of 1.0 – 1.5 μm, which contributes to its smooth application and excellent blendability on the skin.
Absolutely. Its hydrophobic properties make it ideal for liquid and cream foundations, as it disperses easily in the oil phase and helps improve the formula’s wear-time and resistance to moisture.
As a pure iron oxide, this pigment naturally provides an opaque, matte finish. The surface treatment enhances the skin feel without adding shimmer or pearl, resulting in a true matte effect.
Yes, this high-purity iron oxide (CI 77491) is FDA-approved and globally compliant for use in all cosmetic applications, including lipsticks, lip liners, and other lip formulas.

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SDI Red IO AS

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