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Question :   How to Classify Material ?
Answer :   Mild Steel / 4.6 - 5.8
Answer :   High Tensile / 8.8
Answer :   Alloy Steel / 10.9 - 12.9
Answer :   Stainless Steel A2 / 304
Answer :   BRASS / COPPER
Answer :   Stainless Steel A4 / 316
Answer :   NYLON / PLASTIC
Answer :   SPECIAL