application
application
application
application
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Painting and Coating
The newly developed iron oxide dispersant offers the dual advantages of electrostatic and steric stabilization. Even under long-term storage conditions, it provides lasting pigment stability and consistently maintains high tinting strength. Furthermore, this additive reduces the viscosity of the pigment concentrate, allowing for higher pigment loading and reducing the amount of concentrate needed to cover a given surface area.
The increasing demand in the construction industry for pigments and fillers with higher opacity and coloring power has led to more strict performance requirements for iron oxide dispersants. This necessitates the availability of iron oxide powders in various colors and using different manufacturing processes.
Ceramics
Ceramics is one of the industries where iron oxide is most widely used. Ceramic glaze manufacturers tend to use Huayuan New Materials' iron oxide red pigment to formulate the various color shades they require.
Rubber and Plastics
Iron oxide (especially red iron oxide) plays a dual role in the rubber and plastics industry: as both an inorganic pigment and a functional filler.
Tinting strength: Provides a stable, weather-resistant red/reddish-brown hue.
Reinforcement and modification: improving the heat resistance, aging resistance, and electrical insulation properties of rubber/plastics
In the rubber and plastics industry, iron oxide is not simply used for "adding color"¡ªit's both an aesthetic enhancer and a performance booster!
By carefully controlling its purity, particle size, pH, and dispersibility, it's possible to maintain the desired color while simultaneously improving the product's durability, safety, and added value
Paper making
Iron oxide pigments are inorganic pigments used as fillers in certain specialty papers, but their application is not widespread. These pigments belong to the group of iron-based colorants, and typically only four types are used: iron oxide red¡¢yellow¡¢black and brown
The common characteristics of iron oxide pigment are that they are insoluble in water and have no affinity for pulp fibers. They need to be fixed onto the fibers with the help of alum to achieve coloring and act as a filler. Iron oxide pigments have strong lightfastness and good covering power
In high-grade decorative base papers (such as pine wood pulp paper), iron oxide pigments not only act as fillers but can also partially replace expensive titanium dioxide, while simultaneously providing coloring functions and replacing costly and highly polluted organic dyes
leather
Index Requirement illustration
Color fastness (lightfastness) ¡Ý level 7 (ISO 105-B02) Luxury goods/automotive interiors require a level 8 rating, and new pigments like BioBlack TX can achieve 8/8.
Abrasion resistance Dry rubbing: ¡Ý4th grade, Wet rubbing: ¡Ý3rd grade If iron oxide is poorly dispersed, it is prone to fading; optimization can improve the color fastness by 1¨C2 grades.
Heavy metal content Compliant with REACH and RoHS Lead, cadmium, mercury, and hexavalent chromium must not be detectable; this is a mandatory requirement for export.
Dispersion Particle size: 0.4¨C0.7 ¦Ìm, 3000 mesh or finer Needle-shaped (yellow) or spherical (red/black), affecting the uniformity of penetration.
pH adaptability 3¨C8 (depending on the type of leather) Vegetable-tanned leather is slightly acidic (pH 3¨C5) and requires stable iron oxide to prevent discoloration.
Tinting strength 95¨C105% (compared with the standard sample) High purity (FeO ¡Ý96%) ensures color saturation.
Water-soluble salt ¡Ü0.3% Excessive amounts can cause the leather to "whiten" or affect the adhesion of the coating.
Food and drugs
index Requirements (taking red iron oxide as an example) illustration
FeO content: ¡Ý98.0% To ensure stability of tinting strength.
Water-soluble matter ¡Ü0.5% (To prevent dissolved impurities from affecting the efficacy of the medication)
Acid-insoluble matter: ¡Ü0.3% To Guarantee purity
Heavy metal limits Lead (Pb) ¡Ü 0.001% Arsenic (As) ¡Ü 0.0003% Cadmium, mercury, etc., must not be detectable. To comply with ICH Q3D Elemental Impurities Guideline.
Microbial limits The product must pass tests for total bacterial count, E. coli, Salmonella, etc. Especially oral solid dosage forms.
Particle size distribution Normally D90 ¡Ü 10 ¦Ìm. Being too coarse will affect the uniformity of the coating.
Incandescent weight loss ¡Ü4.0% (Iron Oxide Purple/Black ) Reflection of moisture and volatile matter content.
Purity and composition
¡ñ Iron oxide content ¡Ý95% (Superior grade requires ¡Ý96%, refer to GB/T 1863-2008)
¡ñ Heavy metal limits
¡ñ Lead (Pb) ¡Ü 10 mg/kg
¡ñ Arsenic (As) ¡Ü 3 mg/kg
¡ñ Mercury (Hg) ¡Ü 1 mg/kg
¡ñ Cadmium (Cd) ¡Ü 5 mg/kg
Particle size control (directly affects skin feel)
¡ñ Common iron oxide: 0.1¨C0.7 micrometers (suitable for pressed powder and eyeshadow)
¡ñ Micronized transparent iron oxide (for high-end liquid foundations)
¡ñ Dv(90) ¡Ü 40 nm ( 90% of the particles are smaller than 40 nanometers)
¡ñ D50 ¡Ü 300 nm (median particle size, which determines whether it feels "powder-free")
