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The material must be in a state of equilibrium with the ambient climate. This is attained by conditioning, which means that the test material is stored in the test climate conditions for an adequate period of time so that it attains the same conditions as the surroundings. The regular standard climate for the conditioning and testing of plastic and rubber is 23 2 C with a relative humidity (RH) of 50 5%. Other climatic conditions are applied in special contexts. When the requirements of climate ฤทธิยะวรรณาลัย ประถม control are stricter, the tolerances are decreased to 1 C and 2% RH Polymer materials adapt gradually to changes, sometimes so slowly that the memory of the earlier state remains in the material. Particularly, this applies to the memory of the manufacturing process from raw material to end product. This must be kept in mind when decoding test results. Climate chamber for conditioning of test pieces. (Photo: Binder) The resistance of a polymer material to an imposed deformation frequently relies on the deformation rate. If the deformation is extremely slow, the material can flow like a liquid, almost without resistance. If the deformation is extremely fast, many materials react elastically, that is โรงเรียนฤทธิยะวรรณาลัย แผนที่ to say the reactive forces are proportional to the size of the deformation.

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