Plastic Injection Molding Design and Manufacturing
Urethane is a common replacement material for parts and components
made from plastics, ferrous and non-ferrous metals. The
following are advantages of replacement urethane parts and
has excellent abrasion resistance and typically
outperforms rubber, plastic or metal in severe
abrasion and wear environments. Urethane has very
good chemical resistance to
most solvents, chemicals, aliphatic based oils, and greases.
Selected Urethane formulations have excellent dimensional
stability over a broad range of temperatures, stress and pressures.
Urethanes also have excellent resistance to compression
and tension set . They can be stretched to significant
stress levels and return to their original size.
Urethane compounds have very good electrical
properties , such as dielectric strength,
dielectric constant, and resistivity. Urethane is commonly
used as an electrical insulating material.
parts may have a wide range of hardness, from 20 Shore A
durometer (rubber band) to 75 Shore D durometer
(Aluminum). Urethane has great impact resistance, with even the hardest
Urethanes, you have significantly better impact resistance than plastics and
composites. While conventional plastic materials can
become brittle as they become harder, urethane retains
elasticity and strength over the complete range of
durometer Urethanes compounds are easily
drilled, tapped and machined. Hard durometers
Urethane parts are often used in gears, cams, control
mechanisms, and other applications. Soft durometers
compounds are commonly used to replace rubber for improved sound/vibration
parts may be manufactured in elastic ranges between 250-1000 lbs/linear
inch, and are far superior to natural rubber in all
applications. Therefore, Urethane may be used for drive belts,
seals, diaphragms, gaskets, and other applications
requiring strength and flexibility .