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What a resin or chemical is, its properties, uses and naming.
Polypropylene plastic is a semi-crystalline thermoplastic polyolefin, polymerised from propylene gas and sold as pellets. It is the second-largest commodity thermoplastic by volume once the polyethylene grades are counted as one family. The base polymer is cleared for food contact…
Why does the same resin family produce a milky homopolymer pail and a near-transparent yogurt cup? Clear polypropylene is not a separate grade family. It is two decisions stacked on top of a commodity polymer: a random copolymer base resin…
A GPPS spec sheet hands you about ten numbers, and four of them decide whether the resin fits your part. Melt flow index sets the molding window. Vicat softening sets the service-temperature ceiling. Notched Izod tells you whether the part…
Polypropylene is a plastic — one specific thermoplastic in the polyolefin family, not an alternative to plastic the way the question often gets asked. “Plastic” is the parent category that also covers polyethylene (PE), PVC, PET, and polystyrene (PS). So…
DMDS is dimethyl disulfide, CH3SSCH3 — a colourless to pale-yellow organosulfur liquid with a strong garlic odour, CAS 624-92-0, bought by refineries and petrochemical plants as a sulfur carrier. It holds 68 % sulfur by mass and releases it as…
A general-purpose injection-molding ABS has a tensile strength of about 45 MPa (6,500 psi), reported as tensile stress at yield at 23 °C. Across unfilled grades, producer datasheets run from 38 MPa for a very-high-impact grade to 47 MPa. Every…
ABS plastic is acrylonitrile butadiene styrene, an amorphous thermoplastic in which a rigid styrene–acrylonitrile copolymer is toughened with polybutadiene rubber. It is chosen for its combination of stiffness, impact strength and surface finish. It is a high-volume engineering plastic, a…
Polypropylene’s common uses are packaging, household goods, car parts, building products, electrical parts, pipes and tanks, fibers and nonwoven fabrics, and medical and lab products. It covers that many uses because it is light, resists water and most chemicals, and…
High impact PP is polypropylene toughened by a rubber phase: particles of ethylene-propylene rubber dispersed through a polypropylene matrix, either formed in the polymerisation reactor or blended in afterwards. The rubber particles make it much tougher than homopolymer, in the…
Polypropylene’s glass transition sits close to 0 °C: read as the tan δ peak in a DMA run at 1 Hz and 3 °C/min, the isotactic matrix relaxes at about 1 °C (33.8 °F). ISO 11357-2 defines Tg as a…