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The production costs of these plastic fittings are significantly lower than these for metallic fittings.
Both products PPSU and PVDF can be processed on standard injection moulding machines.
The Melt temperature of PVDF is in the same range than for Polyolefins whereas for PPSU the temperature will be 100°C higher.
Due to its semi-crystalline characteristics, the mould temperature of PVDF can be processed in water cooled tools.
PPSU requires the use of oil cooled tools to facilitate low levels of moulded in stress, typical of an amorphous polymer.
PPSU, an amorphous material, provides consistent and isotropic shrinkage over a wide processing range.
PVDF, a semi-crystalline material, requires like PE or PP, control of processing characteristics to insure consistent dimensions.
PPSU must be dried prior to moulding to prevent defects.
PVDF does not require drying prior to melt processing.
Material of construction of the tools and of the machine:
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