MIL-R-6855 / MIL-PRF-6855 Class 2 Neoprene Sheet
MIL-R-6855 / MIL-PRF-6855 Class 2 Neoprene Sheet is a military-specification polychloroprene (CR) rubber sheet meeting the requirements of MIL-R-6855 and its superseding specification MIL-PRF-6855 Class 2. Available from 30 to 80 Shore A durometer, the material delivers tensile strengths from 1,200 to 1,600 psi and elongation from 150% to 500% depending on grade, across a service temperature range of -67°F to +220°F. The sheet is produced in the USA in a smooth black finish and available in both 36″ and 48″ standard widths, with talc-free grades available.
Key Properties
- Durometer, Shore “A”: 30 to 80 (six grades available)
- Tensile Strength, psi: 1,200 to 1,600 (typical, varies by grade)
- Ultimate Elongation, %: 150% to 500% (typical, varies by grade)
- Temperature Range: -67°F to +220°F
- Estimated Weight Per Linear Foot (1/4″ × 36″): 2.36 to 2.78 lb (varies by grade)
- Specification: MIL-R-6855 / MIL-PRF-6855 Class 2
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- Specifications
- Applications
- General Info
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Physical Properties
| Property | Value | Test Method |
| Specification | MIL-R-6855 / MIL-PRF-6855 Class 2 Type A & B | — |
| Thickness Range, inches | 1/64–1 | — |
| Width, inches | 36, 48 | — |
| Temperature Range | -67°F to +220°F | — |
| Finish | Smooth | — |
| Color | Black | — |
Physical Properties by Grade
| Property | 30 Duro | 40 Duro | 50 Duro | 60 Duro | 70 Duro | 80 Duro |
| Durometer, Shore “A” | 30 | 40 | 50 | 60 | 70 | 80 |
| Tensile Strength, psi (typical) | 1200 | 1300 | 1500 | 1500 | 1600 | 1600 |
| Ultimate Elongation, % (typical) | 500 | 500 | 350 | 300 | 200 | 150 |
| Est. Weight Per Linear Foot (1/4″ × 36″), lb | 2.36 | 2.45 | 2.53 | 2.69 | 2.67 | 2.78 |
Compliance
- MIL-R-6855 — Compliant
- MIL-PRF-6855 Class 2 — Compliant
- Military and defense aircraft seals and gaskets requiring MIL-PRF-6855 Class 2 qualification
- Aerospace fluid system sealing components across a wide hardness range
- Military vehicle and ground support equipment gasketing
- Defense procurement programs specifying neoprene rubber sheet to MIL-R-6855 or MIL-PRF-6855
- General industrial sealing and insulation in oil- and solvent-exposed environments
Common industries: Aerospace, military/defense, aviation, industrial manufacturing, government procurement.
MIL-R-6855 / MIL-PRF-6855 Class 2 Neoprene Sheet is a polychloroprene (CR) rubber sheet produced to meet the requirements of MIL-R-6855 and its current superseding document MIL-PRF-6855 Class 2 — the military performance specification governing neoprene rubber sheet used in aerospace, defense, and military procurement programs.
The Class 2 designation covers a broad durometer range from 30 to 80 Shore A, providing six discrete hardness grades to address the full spectrum of military sealing, gasketing, and insulating applications from soft, conformable low-load seals to firm, load-bearing gaskets. The material is manufactured in the USA and is available in 36″ and 48″ standard widths in thicknesses from 1/64″ to 1″, with custom widths available upon request.
Across the six durometer grades, MIL-R-6855 / MIL-PRF-6855 Class 2 Neoprene Sheet delivers tensile strengths from 1,200 psi (30 Shore A) to 1,600 psi (70 and 80 Shore A) and elongation from 500% (30 Shore A) to 150% (80 Shore A).
These properties reflect the characteristic inverse relationship between hardness and elongation in polychloroprene elastomers: softer grades provide higher conformability and elongation for irregular or low-load sealing surfaces, while firmer grades provide higher tensile and tear strength for structural gasketing applications.
The sheet is produced in a smooth black finish with talc-free grades available, and short form test results are available with every order; full test reports are available upon request at no charge.
Compliant with MIL-R-6855 and MIL-PRF-6855 Class 2.
What differentiates MIL-R-6855 / MIL-PRF-6855 Class 2 Neoprene Sheet from non-specification neoprene sheet?
MIL-R-6855 / MIL-PRF-6855 Class 2 Neoprene Sheet is produced and tested to meet the documented requirements of the MIL-PRF-6855 Class 2 military performance specification — including defined tensile, elongation, and temperature performance thresholds by grade, and documented test reporting. Non-specification neoprene sheet may use similar base polymer chemistry but carries no documented qualification against the military specification, which is required for many aerospace and defense procurement programs.
How does durometer grade affect the performance of MIL-R-6855 / MIL-PRF-6855 Class 2 Neoprene Sheet?
Durometer determines how the sheet responds under compressive sealing load. Lower durometer grades (30–40 Shore A) are softer and more conformable, providing higher elongation (up to 500%) and better ability to fill irregular or low-load sealing surfaces. Higher durometer grades (60–80 Shore A) are firmer with higher tensile strength (up to 1,600 psi) and lower elongation, providing greater resistance to extrusion and compression deformation in structural gasketing joints. Selecting the correct durometer for the sealing load, surface finish, and bolt pattern is the primary design decision when specifying this material.
What is the service temperature range for MIL-R-6855 / MIL-PRF-6855 Class 2 Neoprene Sheet?
-67°F to +220°F, as listed on the TDS.
Is MIL-R-6855 / MIL-PRF-6855 Class 2 Neoprene Sheet suitable for aerospace and military procurement programs?
Yes. MIL-R-6855 / MIL-PRF-6855 Class 2 Neoprene Sheet is produced to meet the requirements of MIL-R-6855 and its superseding specification MIL-PRF-6855 Class 2, which is the applicable military performance specification for neoprene rubber sheet used in aerospace, aviation, and defense applications. Short form test results are provided with every order; full test reports are available upon request at no charge.
How should MIL-R-6855 / MIL-PRF-6855 Class 2 Neoprene Sheet be specified?
Specify MIL-R-6855 / MIL-PRF-6855 Class 2 Neoprene Sheet, durometer grade (30, 40, 50, 60, 70, or 80 Shore A), thickness, width, applicable specification (MIL-R-6855 or MIL-PRF-6855 Class 2 as required), dimensional tolerances, and finished format.
