Cosmetic Grade Iron Oxide Pigments – Key Control Points

Key Control Points for Cosmetic Grade Iron Oxide Pigments: From Heavy Metals to Particle Size Distribution – Solutions Compliant with EU 2023/1545

Introduction

As global cosmetic regulations continue to tighten limits on heavy metals and impurities, particularly under EU 2023/1545 (amending the Cosmetic Products Regulation (EC) No 1223/2009), iron oxide pigments – essential colorants in lipsticks, eyeshadows, and foundations – must now meet stricter safety requirements. Hangzhou Hangyan Technology Co., Ltd. (Hangyan) has identified three key control points for high-quality cosmetic grade iron oxide pigments based on over a decade of export experience.

1. Heavy Metal Control: Exceeding Regulatory Standards

While EU Regulation (EC) No 1223/2009 sets limits for soluble heavy metals (Pb, As, Hg, Cd, Sb), Hangyan applies even stricter internal standards to ensure global compliance.

Heavy Metal EU Limit Hangyan Typical Value Test Method

Lead (Pb) ≤20 ppm ≤0.1 ppm ICP-MS

Arsenic (As) ≤5 ppm ≤0.1 ppm ICP-MS

Mercury (Hg) ≤1 ppm ＜0.1 ppm AFS

Cadmium (Cd) ≤5 ppm ≤1 ppm ICP-MS

Antimony (Sb) ≤10 ppm ≤1 ppm ICP-MS

Technical approach:

Hangyan uses a double purification process (acid precipitation + ion exchange resin) to effectively remove associated heavy metal impurities. Each batch comes with a third-party test report (SGS / Intertek).

2. Particle Size Distribution: The Decisive Factor for Skin Feel and Hiding Power

Particle size directly affects color shade, hiding power, dispersibility, and skin feel:

Particle Size (D50) Characteristics Suitable Applications

0.1 – 0.3 μm High transparency Lip gloss, nail polish (translucent effects)

0.3 – 0.6 μm High hiding power Foundations, concealers (Hangyan’s main range)

>0.6 μm Reduced hiding power, gritty feel Not recommended for premium cosmetics

Hangyan uses laser diffraction (Malvern Mastersizer 3000) for online monitoring, ensuring batch-to-batch D50 variation ≤ ±0.05 μm.

Case example:

A European OEM switched to Hangyan iron oxide yellow (CI 77492, D50 = 0.32 μm) from a previous supplier (D50 = 0.55 μm). At the same addition level (3%), hiding power increased by 18% and the “gritty” feel during application disappeared.

3. Dispersibility and Surface Treatment

Untreated iron oxide pigments tend to agglomerate, causing color spots and shade differences. Hangyan offers two surface treatment options:

Treatment Type Compatible System Benefit

Lipophilic (triethoxycaprylylsilane) Oil-based (lipstick, oil foundation) 40% shorter dispersion time, 15% higher color strength

Hydrophilic (sodium polyacrylate) Water-based (water foundation, BB cream) Direct high-speed mixing, no pre-dispersion needed

4. Batch-to-Batch Consistency: ΔE < 1.0 Guarantee

Using a Datacolor 800 spectrophotometer (D65, 10° observer), Hangyan tests L, a, b values for every batch. Data from 20 consecutive batches of iron oxide red (CI 77491) show ΔE ≤ 0.8, well below the industry typical tolerance (ΔE < 2.0).

Conclusion

For export-oriented cosmetic brands, choosing an iron oxide pigment supplier that provides a complete technical package (TDS, MSDS, COA, third-party test reports) is essential for global compliance. Hangyan products meet EU, FDA, and ASEAN cosmetic regulations. Free technical consultation and sample testing are available.

Download technical documents: Contact Hangyan （hangyan@hangyantech.com）for the cosmetic grade iron oxide product brochure and SGS reports.