Overview
TPR sprue material refers to recycled thermoplastic rubber recovered from injection molding runners and gates. As a byproduct of TPR manufacturing, it offers cost savings while maintaining most mechanical properties of virgin material when properly processed. This regrind material is particularly valuable in industries prioritizing sustainability, as it reduces waste in thermoplastic rubber production. Manufacturers commonly blend it with virgin TPR at ratios of 10-30% for non-critical applications without significant property compromise.
Physical and Chemical Properties
TPR sprue material inherits the base characteristics of thermoplastic rubber, including good elasticity (typically 300-600% elongation at break) and Shore A hardness ranging from 30 to 90. The material maintains decent tensile strength (5-15 MPa) after reprocessing. Chemically, it exhibits resistance to water, mild acids, and alkalis, though performance varies by original formulation. The thermal stability is slightly reduced compared to virgin material, with recommended processing temperatures 5-10°C lower to prevent degradation.
Main Applications
Primary use of TPR sprue material is in non-critical components where surface finish isn't paramount. Common end products include inner layers of shoe soles, industrial gaskets, and tool handles. It's often used for prototyping or short production runs. The material also finds application in compression molding processes and as filler in rubberized asphalt. Some manufacturers utilize it for educational purposes in material science demonstrations of recycling processes in polymer technology.
Safety and Storage
While TPR sprue material is generally safe at room temperature, thermal decomposition during processing may release volatile compounds. Adequate ventilation and personal protective equipment (gloves, masks) are recommended when handling molten material. Proper storage involves sealed containers to prevent moisture absorption, which can cause processing defects. Material should be used within 12 months of production to prevent oxidative degradation. Bulk storage should avoid direct contact with concrete floors to prevent moisture migration.
B2B Procurement Guide
When sourcing TPR sprue material, verify the supplier's quality control measures for contamination removal. Reputable processors will provide material data sheets with key parameters like melt flow index (typically 5-25 g/10min) and ash content (<0.5% ideal). For reference, industrial-grade material with consistent particle size (2-5mm) commands premium pricing. Consider testing small batches for processability before large orders. Established suppliers often offer blended options with controlled virgin material ratios for more predictable performance.
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