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Nylon fiber-forming substance is a long chain synthetic polyamide in which less than 85% of the amide linkages attach directly to two aromatic rings |
Resist weak acids. Soluble in formic and sulfuric acids. Hydrolyzed by strong acids at elevated temperatures. | Strong oxidizing agents, minerals acids cause degradation. Others, loss in tenacity and elongation.Substantially inert in alkalis. | Excellent | Excellent | Prolonged exposure to sunlight causes some degradation. | Excellent |
| Acid Resistance | Alkali Resistance | Mildew Resistance | Aging Resistance | Sunlight Resistance | Abrasion Resistance | |
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Polyester fiber forming substance is any long-chain synthetic polymer composed of a least 85% by weight of an ester of a substituted aromatic carboxylic acid, including but not restricted to substituted terephtyhalate units and parasubstituted hydroxybenzoate units |
Good resistance to most mineral acids. Dissolves with partial decomposition in concentrated sulfuric acids. | Good resistance to weak alkalis. Moderate resistance to strong alkalis at room temperature. | Excellent | Excellent | Prolonged exposure to sunlight causes some strength loss. | Excellent |
| Acid Resistance | Alkali Resistance | Mildew Resistance | Aging Resistance | Sunlight Resistance | Abrasion resistance | |
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Polypropylene fiber forming substance is any long chain synthetic polymer composed of a least 85% by weight of ethylene, propylene or other olefin units |
Excellent resistance to concentrated acids. | Excellent resistance to concentrated alkalis. | Excellent | Good | Stabilizers provide good resistance to sunlight-fading. | Good |