50 Durometer Premium Nitrile Sheet
50 Durometer Premium Nitrile Sheet is a premium grade Nitrile (NBR/Buna N) rubber sheet with a durometer of 50 Shore A, a minimum tensile strength of 2,000 psi, and a minimum elongation of 350%. The material delivers a tightly controlled compression set of 25% maximum at 22 hours/100°C, with an extended service temperature range of -40°F to +200°F (-40°C to +93°C). The sheet carries full ASTM D471 resistance data for Oil #1, Oil #3, and Fuel A, and is rated to ASTM D2000: 2BG520B14EF11E014EO34.
Key Properties
- Durometer, Shore “A”: 50 — ASTM D2240
- Tensile Strength, psi: 2000 min. — ASTM D412
- Ultimate Elongation, %: 350 min. — ASTM D412
- Compression Set, 22 hrs @ 100°C (212°F): 25% max. — ASTM D395 Method B
- Specific Gravity, g/cc: 1.11
- Service Temperature: -40°F to +200°F (-40°C to +93°C)
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- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Polymer | Nitrile (NBR) (Buna N) | — |
| Grade | Premium | — |
| Color | Black | — |
| Finish | Smooth | — |
| Specific Gravity, g/cc | 1.11 | — |
| Hardness, Shore A | 50 | ASTM D2240 |
| Tensile Strength, psi | 2000 min. | ASTM D412 |
| Ultimate Elongation, % | 350 min. | ASTM D412 |
| Compression Set, 22 hrs @ 100°C (212°F) | 25% max. | ASTM D395 Method B |
| Temperature Range (general guideline) | -40°F to +200°F (-40°C to +93°C) | — |
Aging Performance
| Property | Value | Test Method |
| Heat Aging, 70 hrs @ 100°C (212°F) — Hardness Change | ±15 points max. | ASTM D573 |
| Heat Aging, 70 hrs @ 100°C (212°F) — Tensile Change | ±30% max. | ASTM D573 |
| Heat Aging, 70 hrs @ 100°C (212°F) — Elongation Change | -50% max. | ASTM D573 |
Chemical Resistance
| Property | Value | Test Method |
| Oil Resistance, Oil #1, 70 hrs @ 100°C (212°F) — Hardness Change | -5 to +10 points | ASTM D471 |
| Oil Resistance, Oil #1, 70 hrs @ 100°C (212°F) — Tensile Change | -25% max. | ASTM D471 |
| Oil Resistance, Oil #1, 70 hrs @ 100°C (212°F) — Elongation Change | -45% max. | ASTM D471 |
| Oil Resistance, Oil #1, 70 hrs @ 100°C (212°F) — Volume Change | -10 to +5% | ASTM D471 |
| Oil Resistance, Oil #3, 70 hrs @ 100°C (212°F) — Hardness Change | -10 to +5 points | ASTM D471 |
| Oil Resistance, Oil #3, 70 hrs @ 100°C (212°F) — Tensile Change | -45% max. | ASTM D471 |
| Oil Resistance, Oil #3, 70 hrs @ 100°C (212°F) — Elongation Change | -45% max. | ASTM D471 |
| Oil Resistance, Oil #3, 70 hrs @ 100°C (212°F) — Volume Change | 0 to 25% | ASTM D471 |
| Fuel Resistance, Fuel A, 70 hrs @ 23°C (73.4°F) — Hardness Change | ±10 points | ASTM D471 |
| Fuel Resistance, Fuel A, 70 hrs @ 23°C (73.4°F) — Tensile Change | -25% max. | ASTM D471 |
| Fuel Resistance, Fuel A, 70 hrs @ 23°C (73.4°F) — Elongation Change | -25% max. | ASTM D471 |
| Fuel Resistance, Fuel A, 70 hrs @ 23°C (73.4°F) — Volume Change | -5 to +10% | ASTM D471 |
Compliance
- ASTM D2000: 2BG520B14EF11E014EO34 — Compliant
- Oil and fuel system seals and gaskets in hydraulic and fluid-handling equipment
- Industrial machinery gaskets in environments with petroleum oil and fuel exposure
- Die-cut sealing components for automotive and industrial fuel systems
- Hydraulic equipment sealing components requiring controlled compression set
- General-purpose premium NBR sheet for demanding sealing applications requiring documented fluid resistance
Common industries: Industrial manufacturing, hydraulic systems, automotive, oil and gas, machinery and equipment.
50 Durometer Premium Nitrile Sheet is a medium-durometer pure NBR (Buna N) rubber sheet formulated to a premium grade with significantly higher mechanical performance than commercial or industrial NBR grades. At 50 Shore A, it provides a balance of conformability and strength — delivering a minimum tensile strength of 2,000 psi (double that of the 40 durometer industrial grade) and a tightly controlled compression set of 25% maximum at 22 hours/100°C.
The extended service temperature range of -40°F to +200°F (-40°C to +93°C) expands its suitability into lower cold-side and higher hot-side applications compared to standard industrial grades. The material is available in 36″ and 48″ widths from 1/32″ to 1/2″ thickness in a smooth black powdered finish.
50 Durometer Premium Nitrile Sheet carries the most comprehensive fluid resistance dataset of any mid-durometer NBR sheet in the line, with documented ASTM D471 test results for Oil #1, Oil #3, and Fuel A — covering light and heavy petroleum oil exposure as well as ASTM Reference Fuel A.
This breadth of tested fluid exposure data makes it appropriate for sealing design in hydraulic systems, fuel handling equipment, and industrial machinery where multi-fluid exposure is a design consideration. Heat aging per ASTM D573 at 70 hours/100°C shows controlled hardness change of ±15 points, tensile change of ±30% maximum, and elongation change of -50% maximum, confirming thermal stability across its service range.
Compliant with ASTM D2000: 2BG520B14EF11E014EO34.
What differentiates 50 Durometer Premium Nitrile Sheet from the 40 durometer industrial grade?
50 Durometer Premium Nitrile Sheet uses a pure NBR (Buna N) polymer rather than an NBR/SBR blend, and is formulated to a premium grade that delivers twice the minimum tensile strength (2,000 psi vs. 1,000 psi), a tighter compression set limit (25% max. vs. 40% max.), and an extended temperature range (-40°F to +200°F vs. -20°F to +190°F). It also carries documented ASTM D471 fluid resistance data for Oil #1, Oil #3, and Fuel A, whereas the industrial grade is tested only against Oil #3. For applications with documented fluid exposure requirements or tighter mechanical performance thresholds, the premium grade is the appropriate selection.
Why does compression set matter for premium nitrile sealing sheet?
Compression set measures how much of the original thickness a rubber gasket permanently loses after sustained compression. A gasket with high compression set loses residual sealing force over time as the joint relaxes — which can lead to leaks, especially in bolted joints subject to thermal cycling or vibration. The 25% maximum compression set of 50 Durometer Premium Nitrile Sheet (22 hrs @ 100°C) is significantly tighter than the 40% limit of the industrial grade, providing better long-term sealing force retention in hydraulic, fuel system, and demanding industrial sealing joints.
What is the service temperature range for 50 Durometer Premium Nitrile Sheet?
-40°F to +200°F (-40°C to +93°C), as listed on the TDS (general guideline).
Is 50 Durometer Premium Nitrile Sheet suitable for fuel system applications?
Yes. The material carries documented ASTM D471 Fuel A resistance data: hardness change ±10 points, tensile change -25% max., elongation change -25% max., and volume change -5 to +10%. This confirms controlled dimensional and mechanical stability under Fuel A immersion at 23°C/73.4°F for 70 hours, making it appropriate for sealing components in light fuel contact service.
How should 50 Durometer Premium Nitrile Sheet be specified?
Specify 50 Durometer Premium Nitrile Sheet, thickness, width (36" or 48"), compliance requirement (ASTM D2000: 2BG520B14EF11E014EO34), dimensional tolerances, and finished format.
