MIL-R-83285 / SAE-AMS-R-83285 GR80
MIL-R-83285 / SAE-AMS-R-83285 GR80 is an 80 durometer Shore A military grade EPDM sheet rubber engineered for excellent resistance across wide temperature ranges. The compound delivers 1800 psi typical tensile strength and 150% typical ultimate elongation across a service range of -60°F to +300°F. Manufactured in the USA in compliance with the Buy American Act and qualified to MIL-R-83285 / SAE-AMS-R-83285 specifications.
Key Properties
- Durometer Hardness: 80 Shore A (± 5)
- Tensile Strength: 1800 psi (typical)
- Ultimate Elongation: 150% (typical)
- Temperature Range: -60°F to +300°F
- Available Thickness: 1/64″ to 1/2″
- Estimated Weight (1/8″ × 36″): 2.32 lb per linear foot
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- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Durometer Hardness | 80 Shore A (± 5) | — |
| Available Thickness | 1/64″ – 1/4″ (standard); up to 1/2″ available | — |
| Standard Roll Widths | 36″, 48″ (custom up to 55″) | — |
| Estimated Weight (1/8″ × 36″) | 2.32 lb per linear foot | — |
| Standard Color | Black | — |
| Standard Finish | Smooth | — |
Mechanical Properties
| Property | Value | Test Method |
| Tensile Strength (typical) | 1800 psi | — |
| Ultimate Elongation (typical) | 150% | — |
Thermal Properties
| Property | Value | Test Method |
| Temperature Range | -60°F to +300°F | — |
Dimensional Tolerances — Standard RMA
| Property | Value | Test Method |
| Thickness Tolerance, 0.031″ & thinner | ± 0.010″ | RMA |
| Thickness Tolerance, 0.032″ to 0.061″ | ± 0.012″ | RMA |
| Thickness Tolerance, 0.062″ to 0.124″ | ± 0.016″ | RMA |
| Thickness Tolerance, 0.125″ to 0.186″ | ± 0.020″ | RMA |
| Thickness Tolerance, 0.187″ to 0.374″ | ± 0.031″ | RMA |
| Thickness Tolerance, 0.375″ to 0.500″ | ± 0.047″ | RMA |
| Thickness Tolerance, 0.501″ to 0.750″ | ± 0.094″ | RMA |
| Thickness Tolerance, 0.751″ & thicker | ± 10% | RMA |
| Standard Roll Length Tolerance | ± 10% (approximate) | — |
Standard Roll Lengths (Approximate ± 10%)
| Property | Value | Test Method |
| 1/64″ thick | 180 feet | — |
| 1/32″ thick | 150 feet | — |
| 1/16″ thick | 100 feet | — |
| 3/32″ thick | 65 feet | — |
| 1/8″ thick | 50 feet | — |
| 3/16″ thick | 30 feet | — |
| 1/4″ thick | 25 feet | — |
| 5/16″ thick | 20 feet | — |
| 3/8″ thick | 16.5 feet | — |
| 1/2″ thick | 12.5 feet | — |
Compliance
- MIL-R-83285 — Compliant
- SAE-AMS-R-83285 — Compliant (Grade 80)
- Buy American Act — Compliant
- Made in the USA
- Military and defense sealing components
- Seals, gaskets, and sealing components for spec-driven assemblies
- Industrial high-temperature service environments
- Components subject to extreme temperature variation
- Sheet rubber fabrication for military specification work
Common industries: military, defense, aerospace, and industrial high-temperature applications.
MIL-R-83285 / SAE-AMS-R-83285 GR80 is a high-performance military grade EPDM sheet rubber designed to meet MIL-R-83285 and SAE-AMS-R-83285 specification requirements. The 80 Shore A compound is positioned for demanding military, defense, and industrial sealing applications where elastomer performance must be sustained across extreme temperature variation.
Mechanical performance is characterized by 1800 psi typical tensile strength and 150% typical ultimate elongation, with a recommended service temperature range of -60°F to +300°F. The material is supplied with a standard smooth finish; textured (fabric) and matte finishes are available on request.
Roll widths are offered at 36″ or 48″ untrimmed (with up to approximately 3″ of additional width), with custom widths available up to 55″ and trimmed rolls available on request. Thickness tolerances follow standard RMA classifications, and closer tolerances or custom thicknesses can be quoted on request.
Compliant with MIL-R-83285, SAE-AMS-R-83285, and the Buy American Act.
What differentiates MIL-R-83285 GR80 from softer EPDM grades or commercial EPDM sheet?
This grade is qualified to MIL-R-83285 / SAE-AMS-R-83285 at 80 Shore A, making it firmer than typical commercial EPDM and specifically suited to spec-driven military and defense work. It pairs that hardness with 1800 psi tensile strength and a -60°F to +300°F service range, providing documented performance for extreme temperature applications where a softer or non-spec EPDM would not qualify.
Why is temperature resistance critical for this material?
The defining function of MIL-R-83285 EPDM is sustained sealing performance across wide temperature variation. Elastomers that lose flexibility at low temperatures or degrade at elevated temperatures can compromise seal integrity in military and industrial assemblies. This compound is formulated to retain its 80 Shore A hardness, 1800 psi tensile strength, and 150% elongation across a -60°F to +300°F range.
What is the temperature range for MIL-R-83285 GR80?
The recommended service temperature range is -60°F to +300°F.
Is MIL-R-83285 GR80 suitable for military and Buy American Act–regulated environments?
Yes. The material is manufactured in the USA, complies with the Buy American Act, and is qualified to MIL-R-83285 and SAE-AMS-R-83285 specifications, making it suitable for military, defense, and federal procurement applications calling out those standards.
How should MIL-R-83285 GR80 be specified?
Specify grade (MIL-R-83285 / SAE-AMS-R-83285 GR80), thickness, roll width, finish (smooth, textured/fabric, or matte), trimmed or untrimmed rolls, dimensional tolerances, compliance requirements, and finished format.
