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Strengths: Broad temperature use range (from -40 to120°C), excellent resistance
to hot or cold hydrolysis, repeated sterilization possible, can be machined, excellent
dielectric properties (insensitive to temperature and moisture), suitable for using
non-halogenated flame retardants, good load bearing characteristics, UV stable,
can be electroplated, painted, printed, hot stamping.
Limitations: naturally opaque, poor chemical resistance, high coefficient of friction,
High viscosity, Fire hazard properties without FR, poor colour stability, High cost
(compared to competitive polymers (ABS, PC), coloured for acceptable visual finish
Applications: Solar heating systems, Roofing panels, Business machine chassis,
frames and housings, Computer, Printers and copiers components, water pump
components, plumbing fixtures, Coil forms and bobbins, Appliance housings,
Instrument panels, Beverage dispenser components, Vaporizer parts, Surgical
instruments, Electronic components, Electroplated automotive wheel covers and
grills, structural foam, electric irons.
55) Polyurethane (PUR):
Polyurethanes are polymers made by reacting diisocyanates with a range of
polyols. Depending on the type of polyols and diisocyanates involved,
polyurethanes may be thermosetting or thermoplastic, rigid and hard or flexible and
soft, solid or cellular with great property variances, providing extremely broad
hardness range. From material as soft as an eraser to as hard as bowling balls are
possible. Depending on the desired end product, other ingredients such as
catalysts, blowing agents (for density control) and flame retardants are used.
PUR is unique material combining the toughness and durability of metal with the
elasticity of rubber. It has excellent abrasion resistance, tensile and tear strength
combined with high load bearing capabilities and excellent damping properties. It
also offers excellent weatherability, resistance to ozone, oxygen, oils, greases and
fuels, radiation and UV resistance.
Natural colour of material is from clear to opaque so wide colour range is possible.
Strengths: Absorbs impact and vibration, resilient and tough, abrasion resistant,
can be cast into a variety of shapes and finished parts, can be cast directly onto
metal wheels and rollers, hard grades can be machined easily.
Limitations: Poor thermal capability (use restricted above 120°C), attacked by
most solvents, utilize toxic isocyanates, Flammable
Applications: Principal applications are as adhesives, sealants coatings,
elastomers and foams.
Flexible material components like bellows, diaphragms, gaskets and seals,
microcellular foam, Screen printing squeegees, hoses
harder parts such as rigid foam insulation panels for buildings, Refrigerators and
freeze, elastomeric wheels and tires such as roller coaster, escalator and
skateboard wheels, Packaging machinery components and mounts, shoe soles
and heels, automotive interiors, suspension bushings and bumpers, Scraper
blades High performance adhesives; surface coatings and sealants around pipes,
boilers, floorings, synthetic fibers, carpet underlay

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