This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of suspended electromagnetic iron removers. This standard is applicable to suspended electromagnetic iron removers (hereinafter referred to as iron removers) that remove ferromagnetic items weighing 0.1kg to 25kg mixed in bulk non-magnetic materials.
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GB/T 3768 Acoustics—Determination of sound power levels and sound energy levels of noise sources using sound pressure—Survey method using an enveloping measurement surface over a reflecting plane*, 2017-12-29 Update
GB/T 5783 Hexagon head bolts.Full thread*, 2016-02-24 Update