Overview
Polyester Injection Molding Color Paste is a pre-dispersed pigment system specifically formulated for polyester resins. It enables uniform coloration during injection molding while maintaining the polymer's mechanical properties. These color pastes are engineered to withstand high processing temperatures (typically 250-300°C) without degrading. They contain concentrated pigments (20-50% by weight) suspended in a polyester-compatible carrier system that ensures homogeneous distribution in the final product.
Physical and Chemical Properties
The paste exhibits excellent thermal stability, crucial for polyester processing where temperatures exceed 250°C. Its viscosity is carefully controlled for easy handling and pumpability in industrial settings. Key performance indicators include lightfastness (resistance to UV degradation) and chemical resistance to common solvents. The color strength is typically 10-100 times greater than powdered pigments, allowing for economical usage rates of 0.5-5% by weight in most applications.
Main Applications
Primary use is in manufacturing colored polyester components for automotive (connectors, housings), electrical (switchgear, insulators), and consumer products (appliance parts, packaging). Specialty applications include optical lenses where precise color matching is critical, and industrial components requiring color-coding for identification. The paste's consistency ensures batch-to-batch color consistency superior to dry pigment blending methods.
Safety and Storage
While generally safe when processed correctly, precautions should be taken against dust formation during handling. The paste form significantly reduces airborne particles compared to dry pigments. Storage requires protection from freezing and excessive heat (recommended 15-30°C). Containers should be kept tightly sealed to prevent moisture absorption, which could affect processing characteristics. Shelf life is typically 12-24 months when stored properly.
B2B Procurement Guide
Industrial buyers should specify: polyester resin compatibility (PET, PBT, etc.), processing temperature range, and required color standards (Pantone, RAL). Request samples for trial processing before bulk orders. Evaluate suppliers based on technical support capabilities, quality control certifications (ISO), and ability to provide consistency across large production runs. Lead times for custom colors typically range 2-6 weeks.
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