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For each type of material products are a variety of sampling methods and test specimens specified in international standards, for example, the location, direction, quantity etc. that are representative of the material is specified.

Tensile specimens are classified to variously plate, round, etc. according to materials products, In the case of Charpy Impact Test is classified with V- notch, U-notch ,etc.

In addition, there are required accuracy specified in the standard for sampling of test specimen ; such as dimensions, machining, roughness, and etc.
If found a defect in the test specimen by sampling and machining, it may cause to other test results.
To provide various test specimens required to metallic material by the best precision specified in the standard.