|Item||Urethanes for heavy loads||High-deflection
|H type||M type||S type||L type||Economy type|
|Hardness (Shore A)||95||90||80||70||90||N / A (foam)||70|
|Operating environment temperature (°C)||-20~+70||-5~+80||-20~+70|
|Ignition point (°C)||500||450||400|
|Features||Weather resistance||Each type has better weather resistance than ordinary rubber materials.|
|Water resistance||Can be used even if exposed to a small amount of water. (Cannot be used under conditions of constant water immersion.)|
|Oil resistance||Can be used even if exposed to a small amount of cutting oil. (Cannot be used under conditions of constant oil immersion.)|
|Discoloration||Becomes discolored when exposed to ultraviolet rays (including sunlight), however there is no adverse effect on performance. Relatively more discoloration occurs with high-deflection type urethane foams than with other types.|
|Properties||•Provides the largest load resistance, for better contour forming.
•Because of the small deflection amount, this type can be used only for simple forming.
|This type has physical properties intermediate between the H and S types, and can be used for general purposes.||Although the load resistance is lower, the larger deflection amount allows deeper forming.||Although the hardness is equivalent to general rubber materials, this type has superior abrasion resistance and mechanical strength.||Although the load resistance and durability (permanent strain) are somewhat inferior to the M type, the prices are lower.||•Can be used for high deflection (40%max.)
and high load applications.
•The lateral expansion is about half that of the M type at an equivalent deflection.
•Because this type is foamed urethane, it provides excellent heat radiation performance.
|With low permanent strain and excellent shock absorbing performance, this type can deliver antivibration performance.|
|Machining of thin stainless steel plates or steel plates approximately 2mm thick||Machining of thin plates of materials such as aluminum or brass||•Bulging
|More suitable for smallvolume production than the M type.||Often used as pad cushions and cam return cushions.||•Vibration proofing
•Machining of soft materials such as films.
|Item||Cost to load ratio||Machinability||High speed endurance||Load stability||Permanent strain||Initial pressure||Operating environment temperatures|