Explore Our Military-Grade Polyurethane Products & Materials
We manufacture custom molded polyurethane parts, rugged polyurethane sheets, and bond polyurethane parts to metal for the military. Our bonding process is designed for reliable performance in extreme applications to extend the life cycle of metallic and plastic parts. 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 fourth 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. Polyurethane products have been the optimum choice for the military, due to strict guidelines and requirements. Consistently providing high-quality polyurethane products with the use of advanced manufacturing technology is the foundation of PSI Urethanes.
Military Grade Polyurethane Parts
DSP Grade Material Properties and Requirements
The table below summarizes some of the physical property requirements for parts made from castable, general-purpose polyurethane material. This data was pulled from the Defense Standardization Program (DSP) MIL-DTL-83397B document. To access this spec sheet in its entirety, 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
The following properties apply to both Class 1 and Class 2 polyurethane material.
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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