D618-21 Pdf — Astm

– Many have site licenses to ASTM standards.

A: Yes, except for tests where the standard test method (e.g., ASTM D638 for tensile) specifies a different condition. astm d618-21 pdf

Plastics are hygroscopic or hydrophobic to varying degrees. Nylon absorbs moisture from the air, becoming more flexible and impact-resistant. Polycarbonate, on the other hand, can become brittle if too dry. Without a standard like ASTM D618, one laboratory might test "dry-as-molded" nylon while another tests nylon conditioned at 50% RH. The results would disagree by 50% or more. – Many have site licenses to ASTM standards