Polyamide - Nylon 6, 6 - PA 6,6
General Information for 'Nylons'. A family of similar semi-crystalline engineering thermoplastics generally synthesised from straight chain aliphatic acids and amines. Each particular nylon is described by one or two numbers eg nylon 6 or 6,6 where the number is the number of carbon atoms in the amine and acid monomers. Where a single number is used the monomer is an Alpha amino-acid (or its lactam) and the amide links in the polymer are all "head-to-tail". Where two numbers are used the monomers are a diamine and diacid and the amide links alternate "head-to-tail"/"tail-to-head". The first number refers to the diamine, the second to the diacid. Some nylons use aromatic monomers which are denoted by letters eg T for terephthalic and I for isophthalic components. Nylons generally are strong, tough (but notch-sensitive), rather resilient polymers with good barrier properties and high fatigue and abrasion resistance. However, they have high water absorption (slow in thick sections) accompanied by an increase in dimensions which can be as much as 3% under extreme circumstances. Nylons have good resistance to oils, greases, solvents and alkalis but not to acids which tend to hydrolyse them. The most common nylons are 6 and 6,6 and in the individual descriptions the others are described in relation to them. General Description of Nylon 6,6 : A semi-crystalline, off-white engineering thermoplastic that is the strongest and most abrasion resistant unreinforced aliphatic nylon with better low temperature toughness than Nylon 6 or acetal. Its very low melt viscosity can give industrial processing difficulties and weathering can cause embrittlement and colour change unless it is stabilised or protected. Available with a wide range of fillers notably glass fibre, which gives a marked increase in stiffness, and solid and liquid (oil) lubricants. Super-tough grades are also available whose impact properties and low notch sensitivity are amongst the best of all engineering thermoplastics. Applications include mainly engineering components eg gears, bearings, nuts, bolts, rivets and wheels and power tool casings and rocker box covers. Widely used as monofilament for brushes etc and fibre - notable for its resilience and high abrasion resistance - for apparel, carpet and industrial end-uses.
Tex Number: 1.3, Filament diameter: 0.01mm, Number of filaments: 14
Tex Number: 1.7, Filament diameter: 0.025mm, Number of filaments: 3