Proveedores de resina PET virgen grado botellas
Abastézcase de resina PET virgen grado botellas de proveedores B2B verificados en Towobo — PET IV 0.72–0.84 dL/g para productores de preformas de botellas de agua, bebidas carbonatadas y aceite alimentario en África, Asia y en todo el mundo.
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Buscar proveedores de resina PET en Towobo →Intrinsic viscosity — the key specification for bottle-grade PET
Intrinsic viscosity (IV), measured in dl/g, is the most important specification for bottle-grade PET resin. IV reflects the molecular weight and chain length of the polymer — higher IV means higher molecular weight, greater melt strength, and better mechanical performance in the finished bottle. The standard IV range for PET bottle resin is 0.72–0.86 dl/g. Water and still beverage bottles (single-use, lower pressure resistance required): 0.72–0.78 dl/g. Carbonated soft drinks (CSD) bottles (must withstand internal CO2 pressure): 0.78–0.84 dl/g. Hot-fill bottles (must resist distortion at filling temperatures): 0.80–0.86 dl/g. Large bottles (5L and above): higher IV (0.80–0.86 dl/g) for adequate melt strength during blow moulding. Specifying the wrong IV for your preform and blow moulding process results in inconsistent wall thickness distribution, haze, and bottle failure. Always confirm the IV specification with your preform toolmaker and blow moulding machine supplier.