Military Grade Polyurethane Products for Defense Applications
PSI manufactures military grade urethane components engineered for demanding operational environments. Our capabilities include custom-molded polyurethane parts, rugged polyurethane sheets, and advanced bonding of urethane to metal substrates to improve structural performance and extend the service life of both metallic and polymer assemblies. These solutions are widely used as urethane for defense applications where durability, impact resistance, and dimensional stability are critical.
All military urethane parts produced by PSI can be manufactured to meet Military Specification MIL-DTL-83397B in accordance with the Department of Defense Standardization Program. This ensures consistent material properties and performance validation for mission-critical components.
Defense systems operate in extreme temperature ranges, high-load conditions, and corrosive or abrasive environments. Military grade urethane is frequently selected because it delivers high tensile strength, tear resistance, and long-term reliability under sustained mechanical stress. Through controlled casting processes and advanced manufacturing technology, PSI produces high-performance urethane components designed to meet strict military requirements for service life and operational readiness.
Military Grade Polyurethane Parts
The military grade urethane parts that we engineer and manufacture include but are not limited to:
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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FAQs
What is MIL-DTL-83397B polyurethane?
MIL-DTL-83397B is a U.S. Department of Defense specification for cast polyurethane elastomers used in military and defense applications.
Why is polyurethane used in military equipment?
Polyurethane offers superior durability, abrasion resistance, and shock absorption compared to rubber and plastic materials.