Military Grade Polyurethane Products
We manufacture custom molded parts, polyurethane sheets, and bond to metal for the military. Our bonding process is designed for extreme applications. Our custom engineered military grade urethane components are utilized in a vast array of applications.
Military grade polyurethane products manufactured by PSI Urethanes can be certified to Military Specification MIL-DTL-83397B, as outlined by the Standardization Program put forth by the Department of Defense.
Military applications demand materials that are capable of withstanding a wide range of severe conditions and extreme environments for extended measures of time. Durability, high performance, and reliability are of the utmost importance for materials. Urethane Technology has been the optimum choice for the military, due to strict guidelines and requirements. Consistently providing high-quality products is the foundation of PSI Urethanes.
Properties and Requirements
The table below summarizes some of the physical property requirements for parts made from castable, general-purpose polyurethane. It was pulled from the Defense Standardization Program (DSP) MIL-DTL-83397B document. (To access this spec sheet, please visit the ASSIST QuickSearch database)
| Properties | Class 1 - 80 Hardness | Class 2 - 90 Hardness |
| Specific gravity * | As Determined | As Determined |
| Tensile strength, psi (MPa), min. | 4000 (27.58) | 4500 (31.03) |
| Elongation, %, min. | 400 | 300 |
| Hardness, Durometer “A”, points | 80 ± 5 | 90 ± 5 |
| Tear strength, psi (MPa), min | 80 ± 5 | 90 ± 5 |
| Temperature retraction (TR-10) °F (°C), max. | -45 (-42.8) | -20 (-28.9) |
Additional Class 1 and 2 Properties
After aging 22 ± .25 hours at 158° ± 2°F (70° ±1°C)s
- Compression set, % max: 35
After aging 7 days at 212° ± 2°F (100° ± 1°C)
- Tensile strength change, %: ± 20
- Elongation change, %: ± 20 for 180 Hardness and ± 30 for 290 Hardness
- Hardness change, Durometer “A”, points: ± 5
After aging 120 days at 160° ± 2°F (71° ± 1°C) and 95% Relative Humidity
- Tensile strength change, %: ± 25
- Elongation change, %: ± 20
- Hardness change, Durometer “A”, points: ± 10
After aging 4 days at 180° ± 2°F (82° ± 1°C) over water (short term test)
- Tensile strength change, %: ± 20
Ultraviolet resistance
- Tensile strength change, %: ± 20
- Elongation change, %: ± 20
*The permissible variation in specific gravity during actual production from that value established in production tests shall be ± .02.
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