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|density||g / cm 3||1.10||1.15|
|balanced water content||23℃, R.H.65%||3.5||2.5|
|bending elastic modulus||GPa||2.5||2.8|
Nylon is polyamide (abbrivated as PA), a condensation type of polymer coming with (-CONH-), that is mostly available in PA6 and PA66., in addutio to PA12, PA11, PA46, PA610, PA 612 demanded fewer in the market, number of which indicates number of carbon atoms in material monomer. The above-mentioned polymer materials are collectively called as nylon engineering plastics.
The unique property of PA is in its advantageous properties of mechanical strength, including toughness, antigrease, self-lubricating, and small coefficient of friction, while having disadvanteges of large humidity absorption that affects size stability. Though PA6 and PA66 are similar in structure, physical property differs significantly, as thermal resistance of PA66 is 50 degrees higher higher than that of PA6.
The advantageous properties of thermal resistance, grease resistance, mechanical strength of PA6 and of PA66 are the main reasons for their being applied to auto parts. In addition, through procedure of added with modifiers of inorganic matter, and glass fiber, they may be endowed with high folding property or suitable for treatments after plating or painting.