1. Combination strength of upper and outsole (except for all rubber and all polymer materials)

Standard requirements: binding strength ≥ 4.0n /mm except the suture base

2. Leakproof of shoes (all rubber, all polymer shoes)

Standard requirements: shoes (boots) should have no air leakage, temperature: (23±2)℃

3. Upper thickness (all rubber, all polymer shoes)

Standard requirements: the thickness of all rubber upper at any place is ≥1.50mm; The thickness of any part of the upper of the full polymer material shoes is ≥1.00mm. Temperature :(20±2)℃, relative humidity :(65±5)%

4. Upper tearing strength (except all rubber and all polymer shoes)

Standard requirements: leather and other materials upper tear strength ≥120N; Tear strength of coated fabric and textile upper ≥60N. Temperature :(20±2)℃, relative humidity :(65±5)%

5. Upper tensile properties

Standard requirements: tensile strength of split leather ≥15N/mm2; Tear strength of rubber ≥180N; 100% constant tensile stress of polymer material 1.3-4.6n /mm2; Elongation at break of polymer material ≥250%; Temperature :(20±2)℃, relative humidity :(65±5)%

6. Upper folding resistance (all rubber, all polymer shoes)

Standard requirements: rubber continuous flexure 125,000 times, should not crack; The polymer material should bend for 150,000 times without crack. Test ambient temperature :(23±2)℃, low temperature chamber temperature :(-5±2)℃

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