This standard specifies standard atmospheres and procedures for the pretreatment, conditioning and testing of paper, paper products, Cardboard and fiberboard. It emphasizes the importance of pretreatment at 50% relative humidity and points out the effect of temperature and Humidity on physical performance. The standard requires samples to be conditioned in a standard environment to ensure accuracy and conformity of test results. This specification is consistent with the TAPPI T-402 technical standard, but does not cover conditioning and testing in special environments. Users should establish appropriate safety measures and determine regulatory restrictions before testing.