Overview
Plastic coloring paste is a pre-dispersed pigment system designed for uniform coloration of thermoplastic and thermoset polymers. Unlike dry pigments, it eliminates dusting issues and ensures consistent color distribution during high-volume production. These pastes typically contain 20-60% pigment load in a carrier resin (often matching the target plastic). They are engineered for specific polymer families like polyolefins (PP/PE), PVC, or engineering plastics, with formulations optimized for dispersion stability and processing conditions.
Physical and Chemical Properties
The viscosity of coloring pastes ranges from 1,000 to 50,000 cP, tailored for either manual mixing or automated dosing systems. Key performance metrics include thermal stability (up to 300°C for engineering plastics) and resistance to bleeding or fading under UV exposure. Modern formulations use heavy metal-free pigments complying with REACH and FDA standards for food-contact applications. Particle size is tightly controlled (typically <5μm) to prevent filter clogging in extrusion processes while maintaining opacity/transparency requirements.
Main Applications
In packaging, coloring pastes dominate thin-film production for bags and wrappers, where precise color matching is critical for brand identity. Automotive applications include dashboard components and exterior trims, requiring UV-resistant pigments. The construction sector uses them for PVC pipes and window profiles, while consumer goods manufacturers apply them to toys, household items, and electronic casings. Specialty pastes with pearlescent or fluorescent effects cater to premium product lines.
Safety and Storage
While most water-based pastes are non-hazardous, solvent-borne varieties require VOC-compliant handling. Suppliers provide SDS documents specifying flash points (if applicable) and PPE recommendations—typically gloves and goggles for routine handling. Storage life averages 12-24 months in original sealed containers. Freezing should be avoided as it may cause irreversible pigment separation. For bulk storage, stainless steel or HDPE tanks with agitators prevent settling.
B2B Procurement Guide
Industrial buyers should specify: 1) Polymer compatibility (e.g., LDPE vs. ABS), 2) Processing method (injection molding vs. blow molding), and 3) Regulatory needs (e.g., EU Toy Safety Directive EN71-3). Sample testing under actual production conditions is recommended, as color development can vary with screw speed and temperature profiles. Large-volume purchasers often negotiate custom formulations with minimum order quantities starting from 500kg.
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