Urethane Compound Specifications
A successfully performing elastomer should be well documented by a meaningful specification.
Why? Because hardness alone is not a reliable specification. At the same hardness we produce many compounds with widely different performance characteristics. Good specifications are essential in competitive bidding and reliable consistency order to order. A good specification should contain data obtained by tests to ASTM standards.
Tested by ASTM Methods
| Hardness | D2240 |
| Tensile Strength | D412 |
| Elongation | D412 |
| Modulus at 100% or 300% | D412 |
| Tear Strength (DIE C) | D624 |
| Tear Strength by D-470 (SPLIT) | D470 |
| Specific Gravity | D792 |
| NBS Abrasion Index | D1630 |
Note: Since the language of rubber technologists differs from that of the metallurgist, consult the glossary of terms. It’s important to understand the differences.
We provide specification sheets on each of our compounds.
Where an application requires specific environmental performance, those requirements should also be listed. We’re always willing to help our customers write specifications. Comprehensive specifications should be on the drawings before they go to the Purchasing Department for quotation requests.
Remember that the chemical structures we use are all premium performance compounds, with no fillers or extenders unless they serve a technical purpose. We never use additives as a way to reduce compound cost. Any reduction of physical and mechanical properties must be balanced with any cost advantages achieved. It is not possible to maximize all properties in one compound. Intelligent compromise is always required.
We have urethane elastomers which can meet the following military specifications:
- MIL-R 83397
- MIL-P 3065 PLUS ASTM D 2000
- MIL-R 45036 (AU/EU)
- MIL-R 45036 D (MR)
- MIL-M 24041
- ASTM-D 2000
- SAE-J 200
- MIL-R 15624
- MIL-M-I 46058
- MIL-M 24041
- MIL-C 24231
We also make urethane compounds which meet FDA and USDA requirements for contact with wet, dry, or oily foods. In addition some compounds meet or exceed flame resistance requirements of mine safety (MSHA). We use MIL-I 45208 for quality assurance.
