There're many different types of Polyurethane,the four basic types are:
A. POLYETHER /TDI
C. POLYETHER /MDI
As a general guide, Polyethers are recommended for applications were parts undergo dynamic stress, ie, they incur lower heat build-up. They also
have advantagesin resilience, low temperature performance and resistance to water attack (hydrolysis).Polyethers also have lower viscosity and
Polyester base urethanes have superior cut, tear, abrasion, oil and solvent resistance.
MDI based products have lower isocyanate odour than similar
TDI types and have superior hydrolysis resistance and higher resilience. TDI based products are less sensitive to moisture, have shorter demould
timeand lowercure temperature requirements compared to MDI types.
Polyurethane is used widely in many industrial fields; some applications are shown as follows.
|Automotive||Grommets, bearings, bushes, flexible couplings.|
|Building and Constructions||Moulds for concrete , gate seals, concrete pump ports|
|Coated fabrics||Conveyor belts, fuel storage tanks, power transmission belts|
|Electrical||Encapsulation, insulation, potting, cable joining.|
|Engineered components||Gears, sprockets, wire guides, rail draft gear, stripper plates, press brake pads, textile yarn guides, cutting boards, business machine Belts, couplings.|
|Food||Chute lining, grain buckets|
|Mining||Bucker liners, conveyor rollers, scraper blades, floatation cell impellers, pump linings, grading screens, lined pipes, cross-over pads.|
|Oil, Chemical and Marine||Bushings, bearings, hydrocyclones, buoys, pipeline pigs and scrapers, fenders, valve seats.|
|Rollers||Board rollers, nip rollers, metal forming, printing, conveyor, can coating, paper mill.|
|Wheel and tyres||Fork-lift tyres, heavy duty caster wheels, escalator wheels, roller skate wheels, roller blade wheels.|
|Shoe Industry||Shoe soles, bottom-moulding diaphragms, wear plates, energy absorbing insoles.|
|Seals and gaskets||Pneumatic and oil seals, diaphragms|