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A PP COA might list “1500 ppm phenolic AO + 1000 ppm phosphite + 500 ppm slip” and look like a complete additive package. Whether those numbers are correct depends on whether the grade is heading into a hot-water pipe,…
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…
A Hyosung pipe-grade datasheet states “PPR 125, MRS 12.5 MPa.” The grade number is ten times the minimum required strength at 20 C over 50 years (ISO 12162:2009). That makes it a hydrostatic strength class, not a temperature rating. A…
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…
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 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…
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…
Virgin polypropylene is new resin made to a producer’s grade specification; recycled polypropylene (rPP) is reprocessed from production scrap or used plastic, and it gives up stiffness, lot-to-lot consistency and easy food-contact approval in exchange for recycled content. It is…
A 25 kg bag of PP pellets received last September is not “last September old.” The producer date stamped on the COA is the real starting point. That date is often 60-90 days earlier than the day the container cleared…