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Polyamides
These resins are exemplified by nylon and are becoming increasingly important as mechanical parts in various operating equipment. In addition, coatings and structural items can be obtained. There are a number of variations in the nylon resins which must be recognized, in as much as varying properties are obtained by the use of different additives or copolymer starting materials. Nylon was one of the first resinous products to be used as an engineering material.
The excellent mechanical properties of the product combined with its ease of fabrication has assured its continued growth for mechanical applications. Excellent strength, toughness, abrasion resistance, and high modulus have been recognized in the applications to date. Such items as gears, electrical fittings, valves, fasteners, tubing, and wire coatings are encountered daily.The heat resistance of the material can be varied, but must be considered in the range of 100 °C (230 F). The chemical resistance is remarkably good for a thermoplastic, the most notable exception being the poor resistance to acids. Stress cracking of nylon parts can occur, particularly in acids and alkali solutions.
These plastics offer the most unique combinations of properties available for use in industrial service. The plastics are usable from minus 190 °C (-310 F) to plus 370 °C. These excellent low temperature properties are often overlooked where a plastic is required to retain some ductility and toughness at such low temperatures. Some combinations of the resins can be taken to 510 °C (950 F) for short periods without destroying the parts. The plastic has excellent creep and abrasion resistance, excellent modulus for a thermoplastic, and good strength that does not drop off rapidly with temperature. The chemical resistance must be rated as good.
The excellent mechanical properties of the product combined with its ease of fabrication has assured its continued growth for mechanical applications. Excellent strength, toughness, abrasion resistance, and high modulus have been recognized in the applications to date. Such items as gears, electrical fittings, valves, fasteners, tubing, and wire coatings are encountered daily.The heat resistance of the material can be varied, but must be considered in the range of 100 °C (230 F). The chemical resistance is remarkably good for a thermoplastic, the most notable exception being the poor resistance to acids. Stress cracking of nylon parts can occur, particularly in acids and alkali solutions.
These plastics offer the most unique combinations of properties available for use in industrial service. The plastics are usable from minus 190 °C (-310 F) to plus 370 °C. These excellent low temperature properties are often overlooked where a plastic is required to retain some ductility and toughness at such low temperatures. Some combinations of the resins can be taken to 510 °C (950 F) for short periods without destroying the parts. The plastic has excellent creep and abrasion resistance, excellent modulus for a thermoplastic, and good strength that does not drop off rapidly with temperature. The chemical resistance must be rated as good.