Enrollment Deadline: 15 February 2026

Participants will test samples using a load of 2.16 kg and one of two temperatures specified by CTS (190°C or 230°C). Testing temperatures alternate between each cycle of testing, and ISO 1133 (Procedure A or B) and ASTM D1238 are referenced.

Sample Description: Two sealed moisture barrier bags, each containing 36 g of polymer, which may come from the same batch or different batches. Enough material is supplied for labs to perform more than two test runs.

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

Additional Information: CTS does not provide melt densities. Laboratories using Procedure B must be able to determine the melt densities for the samples.

This test is included on CTS' Scope of Accreditation to ISO/IEC 17043.