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jobst incorporated
P.O. Box 8 Prior Lake, MN 55372
Phone: 952.447.3904 Fax: 952.447.3709121
Castable Polyurethane Elastomers
General Properties:
| ´ excellent abrasion resistance | ´ low temperatures flexibility |
| ´ high cut resistace | ´ excellent ozone resistance |
| ´ low frictional coefficient | ´ excellent UV resistance |
| ´ high wear resistance | ´ wide range of hardness |
| ´ chemical resistance-resistance to all soap and detergents and mild concentrations of most acids and basic solutions |
| ´ Castable Polyurethane Elastomers even at their highest hardness levels, are tougher than almost all plastics. |
Special Compounds: Molded Dimensions produce custom polyurethane compounds under their Pentathene® tradename. Pentathene® is available in two types.
Pentathane® 6300 Polyester
Higher Abrasion Resistance—Higher Tear Strength—Higher Solvent, Fuel and Oil Resistance—Higher Dry Heat Resistance—Higher Electrical Conductivity.
Pentathane® 6400 Polyether
Reduced Frictional Properties—Improved Low Temperature Flexibility—Extended Flex Life—Increased Hydrolytic Stability—Higher Rebound.
Elastomers Laboratory Writes of Cast Urethane:
The combination of many outstanding properties within a single material makes a urethane distinctive from conventional rubbers and plastics. In fact, one can consider urethane elastomers as a bridge between rubber and structural plastics because they combine many of the desirable properties of both.
It would be more logical, however, to classify urethanes as a new kind of engineering material, rather than to approach their use in terms of prior experience with rubbers, plastics or metals. To achieve best results, the engineer should use cast urethane rubber, not as a substitute for another material, but as new material with unique properties which permit him to take a new design approach.
Cast urethane rubber is a thermosetting material characterized by unusual toughness. It combines resilience and high load bearing capacity with resistance to impact, abrasion and compression set and degradation by oxygen, ozone and oil.
In addition to the unique combination of properties distinguishing it from conventional elastomers, cast urethane also differs in its physical form. It is a liquid polymer which is mixed with a curing agent and can be fabricated by casting.
Castable Polyurethanes are classified as elastomers. Elastomers are materials that have memory. Memory implies that the material can be deformed and upon release return to their original shape. Unlike plastics, polyurethanes are thermosetting materials. Polyurethanes are heat cured and are not re-formable by heat. They are available in a wide range of hardnesses. Castable Polyurethane Elastomers even at their highest hardness levels, are tougher than almost all plastics.
Urethanes exhibit high hysteresis and low thermal conductivity. They do not dissipate heat built up by dynamic action quickly. Avoid heat build-up in design by controlling the amplitude of the deflection
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P.O. Box 8 Prior Lake, MN 55372
Phone: 952.447.3904 Fax: 952.447.3709.6121