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Which of the following scales are used for testing of very soft thermoplastics?

Which of the following scales are used for testing of very soft thermoplastics? Correct Answer R

The A-scale is used for thin hardened steel strips, E-scale is used for cast iron, aluminum alloys, and magnesium alloys, and H-scale is used for soft aluminum and thermoplastics. The R-scale uses a ½ inch diameter steel ball indenter and is used for very soft thermoplastics. For other thermoplastics, the L-scale is used.

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