PBT (Polybutylene Terephthalate)
PBT is a monofilament of PBT developed as a replacement for natural hairs. It has an appearance and feel quite similar to natural hair. PBT offers many of the same properties as Nylon, however, PBT absorbs very little water;
allowing PBT to hold its stiffness in wet applications. PBT is an economical substitute for Nylon 6.6 or 6.12 in many applications, and has better abrasion resistance than polypropylene or polystyrene. PBT also has excellent bend recovery, excellent solvent resistance and excellent oxidation resistance at high temperatures. PBT has very good resistance to sunlight. The properties of PBT do not change much between wet and dry applications because of its ability to not absorb much water.
Excellent bend recovery
Excellent stiffness (wet or dry)
Does not absorb water
Excellent solvent resistance
Excellent heat resistance
Excellent oxidation resistance
Good abrasion resistance
PBT vs. Nylon
When compared with Nylon, PBT is noted for its durability, softness and elasticity. A major difference between nylon and PBT is the ability to maintain stiffness. PBT absorbs much less water than Nylon, allowing it to maintain
optimal stiffness during wet and dry conditions. When saturated in water for 24 hours, Nylon 6.12 has an absorption rate of 3.00% and PBT absorbs about 0.20%. PBT has a 94% bend recovery while Nylon has a 90% bend recovery. These facts make PBT’s more effective and longer lasting than Nylon.
Another major advantage to PBT over Nylon is its chemical resistance properties. PBT rates higher in resistance to the following major chemical categories: Mineral Acids, Organic acids, Oxidizing agents, Organic solvents,
PA612/Nylon 612/N612 Resin
PA612 (Polyamide 612 or nylon 612) is a milky white to light yellow translucent solid made by the condensation polymerization of the neutralized salt of dodecanedioic acid and hexanediamine. General properties are similar to those of PA610 except it has better flexibility and dimensional stability, and has lower water absorption. End use applications include monofilaments, cables and ropes, coil skeletons, mechanical components, tool frames, ammunition boxes, etc.