An introduction to processing-property measurements for raw or compounded unvulcanized rubber and thermoplastic elastomers.
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What the result means
Method A uses a piston-type capillary rheometer; Method B uses a screw-extrusion type. ASTM notes important differences between them, so keep the method, tested material and conditions with any comparison.
Scope and limits
These data can support quality control and compound development. Direct correlation with factory conditions is not implied, and a flow value is not a finished-part service-life prediction. This is buyer education, not a laboratory procedure.
Read the ASTM source: ASTM D5099-08(2022)