Conditioning makes sure that paper and textile samples are exposed to stable temperature and humidity before testing. Materials like these absorb and release moisture quickly, which can change their mechanical behavior. If one batch is tested in dry conditions and another in a humid environment, the results may vary even if the materials are identical.

Standards such as ISO 187 specify controlled conditions for this reason. By conditioning specimens, laboratories create a uniform baseline that makes results consistent and comparable between tests, production runs, or even different facilities. This step is especially important when tear resistance data is used for product certification or customer approvals.

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