PIR engineering plastics: A circular revolution from factory waste to high-end applications

  In electronic manufacturing workshops, the scraps squeezed out of injection molding machine nozzles were once considered waste, but now they have become treasure raw materials for high-end engineering plastics - this is the value leap of PIR (pre-consumer recycled) materials. Unlike PCR plastics recycled after consumption, PIR comes from uncirculated waste such as defective products and sprue materials on factory production lines. It has a single component and its performance stability far exceeds that of mixed recycled materials4. The 40% glass fiber reinforced PIR recycled PPS resin launched by Polyplastics uses an exclusive "re-blending" process to remove 100% of metal impurities, and then scientifically compounded with new materials. While reducing the carbon footprint by 30%, it has passed the UL94 V-0 flame retardant certification equivalent to virgin materials and has been used in new energy vehicle battery brackets and 5G base station precision components26.

  The technological breakthroughs of Chinese enterprises are also impressive: Cangzhou Dahua uses the scraps produced by the continuous process of silicon copolymer PC to develop a high-flow PIR alloy with a silicon content of 20% and a low-temperature toughness retention rate of over 80%; Dongguan Hongshao New Materials innovatively uses 30% marine recycled PET to modify PC, solves the compatibility problem through cycloalkyl compatibilizers, reduces the carbon footprint by 34% and obtains UL Ecologo certification37. The core advantage of PIR materials lies in the short-chain circulation model of "local production-local consumption". Shanghai Chunyi New Materials, relying on the Yangtze River Delta electronic industry cluster, crushes and granulates the factory injection molding waste within 48 hours, and directly supplies it to surrounding connector companies, with a cost 25% lower than imported materials. This closed-loop model not only responds to the mandatory requirements of the EU ELV regulations for recycled plastics, but also achieves an annual reduction of 12,000 tons of carbon dioxide emissions in Tesla's supply chain. When Lotte Chemical's PIR-grade PC alloy is injection molded on a 0.25mm ultra-thin connector, Made in China is refining "green gold" from waste materials