Enrollment Deadline: 15 November 2025

Participants will test samples using ISO 11357 and a heating rate of 20°C/minute. Two samples are used to test crystallization temperature (Tc), melt temperature (Tm), enthalpy of fusion (Hm), and enthalpy of crystallization (Hc), and two samples are used to test glass transition temperature (Tg). Laboratories may report any or all of the offered properties, including optional research properties for ASTM D3418.

Sample Description: Four sealed moisture barrier bags, each containing 10 g of polymer, which may come from the same batch or different batches. Enough material is supplied for labs to perform at least three test runs.

Samples ship in January, April, July, and October for a total of four shipments.

ISO Test Method 11357 is included on CTS' Scope of Accreditation to ISO/IEC 17043. ASTM D3418 is pending inclusion on CTS' Scope of Accreditation to ISO/IEC 17043.