prov:value
| - layers in general include nonwoven fabric, paper, gauze, absorbent wadding, polyethylene or polypropylene having open cells, polyvinyl acetate, porous films and foams of, for instance, polyolefin foams, polyamide foams and polyurethane, natural polysaccharides such as karaya gum, tragacanth gum, xanthane gum, starches, gum arabic, locust bean gum, gellan gum, guar gum and carrageenan; gelatin, pe
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