The short answer Yes, and for packaging and automotive work it is increasingly compulsory. In-house regrind can be fed back at high ratios with little loss; post-consumer recyclate is normally blended at 10 to 35 percent and needs tighter inspection, because molecular weight, colour and odour vary by batch and impact strength can drop by a quarter or more. PIR and PCR are not the same thing Th...

The short answer Water in the pellet turns to steam at melt temperature and breaks the polymer chains, so wet resin produces silver streaks, bubbles, a dull surface and measurably weaker parts. Hygroscopic resins - PA, PC, PBT, PET and to a lesser degree ABS - must be dried to a stated limit, typically 0.01 to 0.10 percent, before moulding. Hygroscopic versus non-hygroscopic resins The dividin...

The short answer Yes, with limits. Bio-based drop-in grades such as bio-PE, bio-PET and bio-PA run on standard injection molding equipment with the same settings as their fossil twins. PLA, PHA, PBS and starch blends mould too, but they need their own mould temperatures, drying and cycle settings, and PLA softens near 60 C, so hot-fill and under-hood use are out. Bio-based and biodegradable ar...

The short answer Choose from the part's duty, not from a price list. Fix the operating temperature range first, then chemical, UV and moisture exposure, then load, impact and creep, then appearance and regulation, and only then cost. The resin family falls out of that sequence; it should never be the starting point. Filter on duty before you open a datasheet Most material mistakes are made in ...

The short answer ABS is popular because one resin delivers impact toughness, a glossy moulded surface and easy processing at a mid-range price. It runs at 210 to 250 C with a wide process window, holds 0.4 to 0.7 percent shrinkage, and accepts paint, plating, gluing and ultrasonic welding better than most plastics. Its limits are UV, heat near 90 C, solvents and flammability. Three monomers, t...

The short answer Injection molding runs three tiers of plastic. Commodity grades - PP, PE, PS and ABS - cover most packaging, housings and consumer parts at USD 1.20 to 2.60 per kilogram. Engineering resins - PC, PA, POM and PBT - add strength, heat resistance and dimensional stability. High-performance grades such as PPS, PEEK and PPSU serve under-hood, aerospace and medical duty. Three tiers...