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Any material specifically designed and constructed to resist deterioration from the action of heat, gas, chemicals or liquids and used to create a tight seal. It is supplied in loose form or in coils, spirals, spools or cut lengths, usually having a square or round cross section. For rubber items having a round cross section, see RUBBER ROUND SECTION. Excludes ROPE, ASBESTOS; CALKING COTTON; and CALKING LEAD. See also PACKING, PREFORMED; and OAKUM.
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