Premium D2/DC53 Concave Shredder Inserts for Plastic Recycling

D2 (1.2379) is the correct choice for post-consumer plastic bales with residual dirt, moisture, and trace contamination — its high chromium-carbide content delivers reliable abrasion resistance at an economical cost point. Upgrade to DC53 when your feedstock includes glass-reinforced engineering plastics (PA66-GF30, ABS) mixed into contaminated HDPE/PP streams. DC53's finer carbide distribution and 25–35% higher transverse rupture strength extend multi-shaft insert service life significantly on hard-face materials within contaminated waste streams.

Heat generation is directly linked to blade face geometry and edge sharpness. A worn, flat-face insert reduces shear efficiency and displaces heat into the material instead of the chip. Our precision-milled concave face reduces shear contact area at each cutting event, dramatically lowering heat build-up and preventing thermoplastic adhesion on the blade.

Micro-rocking is caused by counter-bore positional tolerance exceeding ±0.1mm. Our inserts are CNC-milled to ±0.05mm on all M12/M16/M20 counter-bores, reverse-engineered from factory-measured OEM rotor samples. This eliminates the progressive counter-bore elongation that forces early rotor rebuilds on lower-tolerance inserts.

On a 16-hour continuous line processing post-consumer HDPE and PP, schedule first indexing at 400–600 operating hours with D2, and 600–800 hours with DC53 on clean feedstock. Contaminated or glass-filled streams reduce these intervals by 30–40%. We recommend fixed tonnage-milestone indexing rather than waiting for visible edge rounding — reactive indexing results in wider variance on output particle size.

Yes. We manufacture matched stationary counter-knives and perforated sizing screens as a complete two-shaft shredding system. Supplying rotor inserts and counter-knives from the same grinding run ensures consistent shear clearance across the full rotor-to-bed interface — a critical parameter for output particle size control that is compromised when components are sourced separately.