Overview
Plastic regrind refers to recycled plastic materials recovered from manufacturing waste such as sprues, runners, and rejected parts from injection molding processes. Unlike post-consumer recyclate, regrind typically has known composition and lower contamination levels. Major sources include automotive, electronics, and packaging manufacturers. Common polymer types include PP, ABS, PS, and PC. The material offers cost savings of 30-50% compared to virgin resin while supporting circular economy initiatives.
Physical and Chemical Properties
Properties vary significantly by base polymer but generally exhibit reduced tensile strength (10-25% loss) and impact resistance compared to virgin material due to polymer chain degradation during reprocessing. Melt flow index (MFI) typically increases by 15-30%. Thermal stability decreases with multiple processing cycles, requiring stabilizer additives for critical applications. Color consistency challenges exist for mixed batches. Most regrind maintains >85% of original chemical resistance properties.
Main Applications
Primary use is as a filler material (10-30% blend) with virgin resin for non-structural components like interior automotive trims, appliance housings, and industrial containers. High-quality regrind may be used at 50-100% ratios for pallets, garden furniture, and construction profiles. Specialized applications include sound insulation materials and composite wood-plastic products. Some manufacturers use regrind exclusively for prototyping to reduce material costs during design phases.
Safety and Storage
Regrind presents minimal health risks but may contain residual mold release agents. Proper ventilation is recommended during processing to avoid fume inhalation. NFPA health hazard rating is typically 1 (slight). Storage requires protection from moisture (max 0.1% water content) and UV exposure to prevent degradation. Bulk bags with desiccant are preferred for >6 month storage. Segregation by polymer type and color prevents cross-contamination.
B2B Procurement Guide
Key procurement factors include MFI variance (±5% acceptable), black speck content (<0.1% for light colors), and polymer homogeneity (verified via FTIR testing). Request certificates of analysis for each batch. For consistent supply, establish long-term contracts with molders generating >5 tons/month waste. Pricing typically follows virgin resin market trends with a 3-4 week lag. Consider toll grinding services for operations without reprocessing equipment.
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