Enrollment Deadline: 10 June 2025

Participants will cut samples and test them as received at 100°C in accordance with either ASTM D1646 or ISO 289. These samples do not require mill massing, and results may be reported for Mooney Viscosity as ML 1+4 for all polymers, as well as ML 1+8 when butyl samples are distributed. Stress relaxation properties (t80, X30, and area under the curve) may also be reported for all polymers.

Sample Description: Two sample sets, each consisting of two raw polymers (e.g. SBR, NBR, or butyl). Butyl is sent every quarter for samples one and two, while samples three and four alternate between NBR and SBR each quarter.

Samples ship in August and November for a total of two shipments.

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