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…
Polyethylene resin is polyethylene in the form it is bought and sold: a synthetic thermoplastic made by polymerising ethylene and supplied as pellets for converters to extrude or mould into products. It comes in three commodity types, LDPE, LLDPE and…
Polycarbonate is the stiffer, tougher and more heat-resistant of the two, and it comes out of the mould glass-clear at any wall thickness; polypropylene is a quarter lighter, cheaper per kilogram, moulds without a dryer, and takes the bases and…
A spunbond line runs a fibre-grade polypropylene homopolymer resin whose melt flow rate sits between 25 and 40 g/10 min at 230 °C and 2.16 kg. Where in that band you buy follows from line speed and fabric weight: the…
A carrier resin is the polymer a pigment or additive is compounded into so it can be dosed as a pellet — the base polymer of a masterbatch. Here “resin” means a thermoplastic pellet, so this is a different thing…
A nucleating agent is an additive that gives a molten semicrystalline polymer a ready-made surface to start crystallizing on, so the melt solidifies at a higher temperature and the part sets as a dense population of small crystals instead of…
A PP part that has to be seen through needs a clarifier; a part that only has to be stiffer, hold its shape hotter or leave the mould sooner needs a stiffness nucleating agent, which doses lower and puts no…
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…
DMDS is stored in tightly closed stainless-steel containers, kept upright in a cool, dry, well-ventilated and fireproof area that has no drain or sewer access, held apart from oxidants and acids, with every ignition source controlled all year round. Dimethyl…
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…