Pdf — Astm D618-21

Plastics are hygroscopic, meaning they absorb moisture from their surroundings. This absorption—along with temperature changes—can drastically impact mechanical properties such as:

Conditioning at 23°C and 96% relative humidity . Comparison with ISO 291 astm d618-21 pdf

In the world of material science, plastics are sensitive. Their physical and electrical properties—like strength, flexibility, and conductivity—can change dramatically based on the environment they’ve been sitting in. To make a fair comparison between a plastic made in a humid factory in Florida and one made in a dry lab in Arizona, you need a "standard" baseline. ASTM D618 provides that baseline. The "Long Story": Why It Takes So Long Plastics are hygroscopic, meaning they absorb moisture from