Enroll at any time.

Participants will test in accordance with TAPPI T538.

Sample Description: Two similar samples, each containing ten pre-conditioned 4.25" by 5.5" sheets of paper. Samples range from 50–300 Sheffield units throughout the year.

Samples ship every other month for a total of six shipments beginning with the earliest available cycle of testing. Testing is conducted during January, March, May, July, September, and November, with samples for each test cycle shipping in the month prior.

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