TECAST® T MO Plate

TECAST® T MO is cast nylon 6 (PA 6 C) with molybdenum disulphide worked through it. Ensinger's account is that the MoS₂ increases the degree of crystallinity, which lends the casting higher strength and improved surface hardness and abrasion resistance than standard cast PA 6. The published numbers bear that out: flexural strength is 15,000 psi on a 450,000 psi flexural modulus against 12,500 psi and 350,000 psi for natural, compressive strength at 1% strain is 4,600 psi against 3,400 psi, the compression modulus is 450,000 psi against 360,000 psi, and the wear factor improves to 160 from 200. Tensile strength is 12,800 psi, hardness is Rockwell R118 and M87 with Shore D82, and moisture uptake is 0.54% in 24 hours, less than half the natural grade.

It is the grade for gears, sprockets, sheaves, bearings, bushings, rollers and wear strips in construction and agricultural machinery, mining, gear manufacturing, conveyor technology and oil and gas. Long-term service is 200°F with 300°F intermittent, heat deflection temperature is 200°F at 264 psi, the melting point is 428°F and flammability is UL 94 HB. Two things are worth knowing before specifying it: Izod impact is 0.7 ft-lb/in against 1.4 for the natural grade, so choose natural where the part takes shock, and the dynamic coefficient of friction is unchanged at 0.26, so MO is the harder, more abrasion-resistant cast nylon rather than a lower-friction one. The tensile modulus is also unchanged at 400,000 psi. Black is the only colour.