Polymer & Plastics · Choose the Right Material
Search by test, by standard or by material and the matrix returns the method, the parameter it measures, a practical acceptance limit and the mistake that most often invalidates the result. Use it to write an incoming-goods specification you can actually enforce.
ASTM D5630 / ISO 3451-1
Pre-dry sample 2 h @ 105 °C. Crucible must be cooled in desiccator before weighing — humidity skews ± 0.1 %.
ASTM D6980 / ASTM E1064
Excess moisture causes thermodynamic flashing, micro-void bubbling and surface fish-eyes on blown film extrusion lines.
ISO 18553 / ASTM D5596
Required for full PENT and Hydrostatic design compliance (ISO 4427) for high-pressure PE100 gas and water pipes.
ASTM D1238 / ISO 1133
An MFR drift > 10 % indicates carrier degradation or moisture-induced chain scission.
ISO 23900-5
High FPV warns of poor wet-out — increase mixing energy or shift to surface-treated pigment.
ASTM E308 / ISO 11664
Always measure against a calibrated tile within 24 h of molding — pigments like phthalo blues drift on aging.
Engineering aid only. Validate against your own instrumented trial, the polymer datasheet and the applicable ASTM / ISO method before locking a process window or a specification.
