Astm D618-21 Pdf Instant
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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. 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. astm d618-21 pdf
| Feature | ASTM D618-21 | ISO 291 | | :--- | :--- | :--- | | Standard Temp | 23°C ± 2°C | 23°C ± 2°C | | Standard RH | 50% ± 5% | 50% ± 10% (looser) | | Conditioning Time | 40 hours min | 88 hours (for most materials) | | Test Time Limit | Immediate | Within 15 minutes | A: Go to www