For those requiring accredited testing services for compliance, entities like EUROLAB provide professional testing according to this standard.
This is the most common standard associated with these digits. It establishes the mandatory environmental "pre-conditioning" required for plastic specimens before they undergo mechanical, thermal, or electrical testing. astm d61821 pdf
: The method specifically requires a Bally Flexometer , which flexes leather samples at a standard rate (usually 100 cycles/min). astm d61821 pdf