Thermoplastic Polyurethane Elastomers as Hydraulic Seal Materials

THERMOPLASTIC POLYURETHANE ELASTOMERS AS HYDRAULIC SEAL MATERIALS 

Rubber seals are the normal means of closing the small pathways between adjacent mating metal surfaces present as a result of imperfections in machining, grinding, moulding, pressing and other finishing operations. 

A SUMMARY OF THE RESULTS SHOWING THE EFFECTOF PROCESSING VARIABLES (IN INJECTION MOULDING) ON THE OPTICAL PROPERTIES 

An increase in melt temperature brought about a reduction possibly a result of more release agent diffusing out at elevated temperatures An increase in injection speed brought about an increase a more rapid entry of material into mould means a more uniform melt temperature which produces a more uniform surface and consequently there is less light scattering and higher values 

Interaction of these two parameters brought about an increase probably for the same reason as (2) above 

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