Astm D618-21 Pdf ❲Official❳
ASTM D618-21 is the most recent active revision of a long-standing practice published by ASTM International. It specifies the standard environments and procedures for conditioning thermoplastic and thermosetting materials to equilibrium before testing.
Without conditioning, residual stresses from molding or environmental fluctuations can skew results. The standard provides two primary conditioning procedures:
The "21" suffix indicates the year of last approval—2021—meaning this version supersedes all previous revisions like D618-08 or D618-13. astm d618-21 pdf
ASTM D618-21 is the standard practice for conditioning plastics for testing. Officially titled "Standard Practice for Conditioning Plastics for Testing," this document establishes uniform environments (temperature and relative humidity) and time periods that plastic specimens must be exposed to before mechanical, electrical, or optical testing.
The "21" denotes the year of last approval—2021. While the standard is reaffirmed periodically, the 2021 version currently contains the most up-to-date requirements for humidity control, temperature tolerances, and testing timelines. ASTM D618-21 is the most recent active revision
Details the required equipment:
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. The "21" suffix indicates the year of last
The ASTM D618-21 standard eliminates these variables. It ensures that whether you are testing in Arizona (dry) or Louisiana (humid), your results are comparable.
ASTM D618-21 is the Standard Practice for Conditioning Plastics for Testing. It is administered by ASTM International (formerly the American Society for Testing and Materials).
The standard establishes the procedures for bringing test specimens to equilibrium with specific atmospheric conditions (temperature and humidity) before mechanical, electrical, or physical testing is performed.
Step-by-step guides for conditioning specimens at standard atmospheres, in desiccators, or at elevated temperatures. It also outlines how to determine when "equilibrium" has been reached (typically when consecutive weight differences are less than 0.1%).