Chrome Yellow Middle 3404
Chrome Pigments
Technical Information
Chrome Yellow Middle 3404 — HC-3404
Chrome Yellow Middle 3404 (HC-3404) is a middle-shade PY34 chrome pigment (Standard Improved grade), featuring Sb₂O₃ Sb₂O₃ for enhanced durability and dispersion. CAS 1344-37-2. This grade is designed for Coatings (improved outdoor durability).
Key Features
- Standard Improved Performance: Lightfastness 5-6, Weather resistance 3, Heat stability up to 200-220°C.
- Sb₂O₃ Encapsulation: Antimony trioxide coating provides superior chemical resistance and color stability compared to uncoated grades.
- High Opacity: Lead chromate chemistry delivers exceptional hiding power at low pigment loadings — typical usage 5-15% in coatings.
- Bright Middle Shade: Clean, brilliant middle undertone ideal for industrial and decorative applications.
Recommended Applications
Coatings (improved outdoor durability)
⚠️ GHS Classification: Chrome pigments contain lead compounds. GHS08 (Health hazard) + GHS09 (Environmental). H350: May cause cancer. H360Df: May damage the unborn child. H373: May cause damage to organs through prolonged exposure. H410: Very toxic to aquatic life with long-lasting effects. Always refer to SDS before use.
Technical Data
| Product Information | ||||
| Honor Code | HC-3404 | CAS NO. | 1344-37-2 | |
| C.I. Name | PY34 | Coating | Sb₂O₃ | |
| Grade | Standard Improved | Shade | Middle | |
| Technical Performance | ||||
| Lightfastness | 5-6 | Weather Resistance | 3 | |
| Heat Stability | 200-220°C | Oil Absorption | 15-25 g/100g | |
| Specific Gravity | 5.4-6.0 | pH Value | 5-7 | |
| Packaging & Compliance | ||||
| Packaging: 25 kg composite paper bag, 1000 kg/pallet | Shelf Life: 24 months in sealed packaging | |||
Frequently Asked Questions
What is the difference between Chrome Yellow Middle 3404 and other PY34 grades?
Chrome Yellow Middle 3404 (HC-3404) is a Standard Improved grade featuring Sb₂O₃ encapsulation. Compared to uncoated PY34 pigments, the antimony trioxide coating delivers superior chemical resistance, better color stability during storage, and improved dispersibility in solvent-borne coatings. The middle-shade undertone is brighter and cleaner than economy-grade chrome yellows, making it the preferred choice for industrial coatings requiring consistent batch-to-batch color. Learn more on the Chrome Yellow Middle 3404 product page.
How does Sb₂O₃ encapsulation improve durability in solvent-borne coatings?
The antimony trioxide (Sb₂O₃) surface treatment creates a protective barrier around each pigment particle, preventing direct contact between the lead chromate core and aggressive binder components common in solvent-borne coatings. This encapsulation significantly reduces color drift caused by SO₂ exposure and acid rain, and improves lightfastness to 5-6 (Blue Wool Scale). For alkyd enamel paints, this means the color stays true through the coating’s service life even in moderate outdoor exposure.
Is Chrome Yellow Middle 3404 suitable for alkyd enamel paint formulations?
Yes — Chrome Yellow Middle 3404 performs excellently in alkyd enamel paints. Its oil absorption of 15-25 g/100g allows high pigment loading without viscosity issues, and the Sb₂O₃ coating ensures compatibility with the acidic components found in many alkyd resin systems. The bright middle shade provides vibrant, durable color ideal for industrial machinery, agricultural equipment, and decorative architectural coatings.
Can HC-3404 be used in wood finishes and decorative coatings?
Yes. The high opacity and bright middle shade of Chrome Yellow Middle 3404 make it effective in wood finishes where coverage with minimal coats is important. In decorative solvent-based wood stains and lacquers, it provides warm, rich tones. However, formulators must note the GHS classification (H350, H360Df) — lead chromate pigments should not be used in consumer-accessible applications where direct skin contact or ingestion risk exists. Always verify end-use compliance with local regulations and refer to the product SDS.
What is the heat stability of HC-3404, and what processing conditions can it withstand?
Chrome Yellow Middle 3404 maintains color integrity up to 200-220°C, making it suitable for most solvent-borne industrial coating baking cycles (typically 120-180°C). For powder coating applications requiring higher cure temperatures, we recommend testing under your specific time-at-temperature profile, as extended exposure above 220°C may cause subtle shade drift. The Standard Improved grade provides an optimal balance of heat stability, lightfastness (5-6), and weather resistance (3) for general industrial coatings.
Disclaimer: Specifications are for reference only. Always verify with our team and review TDS/SDS before product use.