Astm D61821 Pdf [exclusive] Jun 2026

Ensure that finished leather meets manufacturer or consumer durability standards.

Because the molecular structures of polymers are highly sensitive to thermal fluctuations and ambient moisture, failing to control these environmental factors will ruin the validity of any subsequent test. Secure digital copies of the protocol are available through authorized distributors like the ANSI Webstore or the official ASTM D618-21 Standard Page . Why Conditioning Plastics is Critical

: This method does not apply to wet blue (un-finished, chrome-tanned leather). Equipment and Apparatus Requirements astm d61821 pdf

Many other ASTM test methods for plastics (such as tensile strength, flexural modulus, or impact resistance) require that specimens be conditioned in accordance with a practice like D618 before the actual test begins.

Minimum of 40 hours for specimens under 7 mm (0.25 in.) thick; minimum of 88 hours for specimens thicker than 7 mm. Ensure that finished leather meets manufacturer or consumer

: Specimens are subjected to customized temperatures, often ranging from -55 °C to elevated temperatures, as required by defense or aerospace applications. Deciphering the Standard Test Designation Format

General testing of rigid, semi-rigid, and non-rigid plastics with desiccation Rapid moisture removal for moisture-sensitive specimens Procedure C Relative Humidity Why Conditioning Plastics is Critical : This method

Designed to quickly drive out residual moisture and eliminate internal stresses from molding. Procedure C: Water Immersion

: 96 hours at 35°C and 90% humidity (for high moisture impact).

: Tailored for removing absorbed moisture or accelerating internal stress relief.