The EN 12477 standard describes how the welding gloves are designed to provide protection for both hand and wrist while welding or simular work, this is a combination from testing EN 388 and EN 407. Welding gloves shall provide resistance to small splashes of molten metal, short exposure to convective heat, to radiant heat and to contact heat. The welding gloves shall give protection from mechanical risks as well.
Type A refer to welding gloves that shall provide a higher protection against heat.
Type B refer to welding gloves that provide a lower protection against heat but they are more flexible and pliable.
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