Overview
Colored urea-formaldehyde (UF) molding compound, known as 电玉粉 in Chinese, is a thermosetting plastic derived from urea and formaldehyde. It is prized for its ability to be dyed in bright, stable colors during production, making it ideal for both functional and aesthetic applications. The material cures permanently under heat and pressure, forming rigid, non-melting products. First developed in the early 20th century, UF compounds became popular as an affordable alternative to phenolics and ceramics. Modern formulations include additives to enhance flow properties, reduce formaldehyde emissions, and improve impact resistance. The material is particularly dominant in Asian markets for electrical and consumer goods.
Physical and Chemical Properties
Colored UF molding compounds exhibit high surface hardness (Rockwell M100-120) and a tensile strength of 50-70 MPa. Their dielectric strength (12-16 kV/mm) and arc resistance make them suitable for electrical insulation. The material is self-extinguishing (UL94 HB rated) and withstands continuous temperatures up to 100°C. Chemically, cured UF resists most solvents but is attacked by strong acids and bases. Prolonged water exposure may cause slight swelling (0.1-0.3%). Colorants are typically inorganic pigments or heat-stable dyes that retain vibrancy even after prolonged UV exposure. The density is higher than many plastics, contributing to a premium feel in finished products.
Main Applications
In electrical engineering, colored UF compounds are molded into switch plates, circuit breaker housings, and socket covers due to their non-conductive properties. The material's ability to hold intricate details makes it ideal for buttons and knobs on appliances. Consumer applications include melamine-like tableware (though less heat-resistant), cosmetic cases, and decorative laminates. In B2B settings, manufacturers often use it for industrial control panels where color-coding is required for safety. Recent innovations include antimicrobial variants for healthcare fixtures and halogen-free formulations for eco-conscious markets.
Safety and Storage
While cured UF products are generally safe, uncured powder may release trace formaldehyde—proper ventilation is essential during molding. Finished items comply with EU REACH and FDA CFR 21 for indirect food contact when specially formulated. Storage requires moisture-proof packaging (below 30% RH) to prevent premature curing. Bulk bags should be kept below 25°C and used within 12 months. During processing, dust extraction systems are recommended as fine particles may irritate respiratory systems. Post-molding, products may require conditioning to reduce residual monomer levels.
B2B Procurement Guide
Industrial buyers should specify: 1) Color matching system (e.g., Pantone or RAL references), 2) Electrical grade (CTI ≥ 250V for high-voltage uses), 3) Filler type (wood flour for cost, cellulose for strength). Sample testing for heat deflection temperature (HDT) under load is advised. Major Chinese producers are concentrated in Zhejiang and Guangdong provinces. MOQs typically start at 1 metric ton, with prices varying by color complexity (reds/yellows cost 10-15% more than standard colors). For export markets, ensure suppliers provide SGS reports for heavy metal content and formaldehyde emission testing (E1 grade or better).
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