Polyurethane elastomers can be formulated to cover a wide range of hardness in which items can be produced. They range from 30 Shore A which is softer than a gum eraser to 95 Shore D which is harder than a golf ball. The various options in properties, enable our expert team to select the right formulation to achieve the desired combination of engineering properties for your application.
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Overall, products made with polyurethane are stronger, tougher and more durable than products made with conventional elastomers and engineering plastics. Polyurethane elastomers are unique engineering materials that facilitate new solutions to thousands of difficult engineering problems.
Equis Industries can engineer custom products with a range of characteristics as follows:
Polyurethane offers a wide hardness range in which items can be produced. They range from 10-15 Shore A which is softer than a gum eraser to over 70 Shore D which is much harder than a golf ball. The different Shore Hardness scales measure the resistance of a material to indentation.
A ‘Shore Hardness’ gauge (looks like a round tire pressure gauge) has a needle on a spring protruding from one end. The needle is placed against the rubber or plastic and pressure is applied. Once the gauge is pressed firmly against the material and the needle has penetrated as far as it can go, the measurement needle will indicate the corresponding hardness measurement.
There are different Shore Hardness scales for measuring the hardness of different materials. These scales provide a common point of reference.
The Shore A Scale measures rubbers and gels that are very soft. The Shore A Hardness Scale measures the hardness of flexible mold rubbers that range in hardness from very soft and flexible, to medium and somewhat flexible, to hard with almost no flexibility at all. Semi-rigid plastics can also be measured on the high end of the Shore A Scale.
Shore D Hardness Scale measures the hardness of hard rubbers, semi-rigid plastics and hard plastics.
There is an overlap on the different scales. For example a material with a Shore hardness of 95A is also a Shore 45D.
In applications where severe wear is a problem, polyurethane often out performs rubber, plastics and metals.
Polyurethanes have great load bearing capability in both compression and shear. This load bearing capability is used to great advantage in the design and manufacture of wheels, rollers and other engineering parts.
At lower hardness levels polyurethanes merely bend under impact. As polyurethanes are compounded up to higher hardness levels they have significantly better impact resistance than almost all plastics.
High Flex Applications
Polyurethanes resist cracking under repeated flexing, and can be used practically in very thin sections because of their strength and toughness.
Polyurethanes absorb very little water and are resistant to the effects of water immersion and can remain stable in water up to 50°C. .
Most polyurethanes are excellent insulators. They are used extensively in potting and encapsulating applications.
Resistance to Oil, Grease and Chemicals
Polyurethanes will generally resist a much wider range of solvents, oils and chemicals than other rubber and plastics.
Polyurethanes can be bonded to a wide range of materials including metal, wood and most plastics. Bond strengths are often greater than the polyurethane itself.