Overview
Colored Plastic Granules are pre-compounded polymer pellets containing uniformly dispersed pigments or dyes. They serve as ready-to-use raw materials for plastic manufacturing, eliminating the need for separate coloring processes. These granules are produced through extrusion and pelletization, ensuring consistent color distribution and batch-to-batch uniformity. Major polymer bases include polyethylene (PE), polypropylene (PP), and acrylonitrile butadiene styrene (ABS). The coloring system typically comprises 1-5% pigment load, with masterbatch technology ensuring optimal dispersion. Granules are available in standard and custom colors, meeting both aesthetic and functional requirements for end products.
Physical and Chemical Properties
The granules exhibit properties inherited from their base polymer, modified by the pigment system. Most variants show tensile strength of 20-40 MPa and elongation at break of 10-500%, depending on the resin. Pigments may slightly alter mechanical properties but generally maintain the polymer's core characteristics. Thermal stability ranges from -20°C to 120°C for standard grades, with engineering plastic variants (e.g., colored PC granules) withstanding up to 150°C. Colorfastness is typically rated at 7-8 on the Blue Wool Scale for UV-resistant grades. Granules have a bulk density of 500-700 kg/m³, ensuring smooth material flow in hoppers and feeders.
Main Applications
Injection molding applications consume approximately 60% of colored granules, producing items like household containers, electronic housings, and automotive interior parts. Extrusion applications (30%) include pipes, profiles, and films, where color consistency along the length is critical. The remaining 10% serves blow molding (bottles, containers) and rotational molding (large hollow items). Specialty applications include anti-static colored granules for electronics packaging and fluorescent variants for safety equipment. Recent developments include biodegradable colored PLA granules for sustainable packaging solutions.
Safety and Storage
Standard colored granules are classified as non-hazardous under GHS, though some heavy metal-containing pigments (e.g., cadmium-based) require special handling. Dust control measures are recommended during bulk handling to minimize respiratory exposure. Storage should maintain relative humidity below 50% to prevent moisture absorption, which can cause processing defects. Shelf life is typically 12-24 months when stored properly. Fire safety measures should follow the base polymer's flammability rating (usually UL94 HB for standard grades).
B2B Procurement Guide
Industrial buyers should specify: 1) Polymer type and grade (e.g., PP homopolymer), 2) Color matching system (Pantone, RAL), 3) Technical requirements (UV stability, food contact compliance), and 4) Packaging preferences (25kg bags, big bags, or bulk). Minimum order quantities typically range from 500kg for standard colors to 5 tons for custom formulations. Lead times vary from 2 weeks for stock colors to 6 weeks for specialty developments. Quality assurance should include testing for color consistency (ΔE<1), melt flow rate (±10% of spec), and mechanical properties.
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