50 Durometer Butyl (IIR) Sheet
50 Durometer Butyl (IIR) Sheet is a medium-soft butyl rubber sheeting compound meeting the requirements of ASTM D2000 M1AA507, with a service temperature range of -40 to +180°F, a tensile strength of 1100 psi, and elongation of 450%. The material is compliant with REACH, RoHS, and California Proposition 65 and is manufactured in the USA. This grade delivers the highest tensile strength and elongation values in the Butyl (IIR) Sheet line, combining mechanical performance with the inherent low permeability, chemical resistance, and weathering resistance characteristic of butyl rubber.
Key Properties
- Hardness, Shore A: 50 ± 5 (ASTM D2240)
- Tensile Strength: 1100 psi (ASTM D412)
- Elongation: 450% (ASTM D412)
- Service Temperature Range: -40 to +180°F
- Specification: ASTM D2000 M1AA507
- Compliance: REACH, RoHS, California Proposition 65
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- Specifications
- Applications
- General Info
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Physical Properties
| Property | Typical Value | Test Method |
| Hardness, Shore A | 50 ± 5 | ASTM D2240 |
| Tensile Strength, psi | 1100 | ASTM D412 |
| Elongation, % | 450 | ASTM D412 |
| Temperature Range | -40 to +180°F | — |
Standard Dimensions
| Property | Value |
| Thickness Range | 1/32″ – 1/4″ |
| Standard Widths | 36″, 48″ |
| Estimated Weight Per Linear Foot (1/8″ x 36″) | 2.2 lb |
Compliance
- ASTM D2000 M1AA507 — Compliant
- REACH — Compliant
- RoHS — Compliant
- California Proposition 65 — Compliant
- Chemical-resistant gaskets and seals
- Pharmaceutical and food processing equipment seals
- Steam system gaskets and seals
- Gas and vapor containment sealing
- General industrial sealing applications
Common industries: Chemical Processing, Pharmaceutical, Food & Beverage, Steam & HVAC Systems, General Industrial.
50 Durometer Butyl (IIR) Sheet delivers the highest tensile strength (1100 psi) and elongation (450%) in the Butyl (IIR) Sheet line at a medium-soft 50 Shore A durometer. This combination of mechanical performance and conformability makes it well suited for applications where both seal integrity under moderate load and resistance to tearing or mechanical stress during installation are important design considerations.
The butyl rubber polymer provides inherent low gas and vapor permeability, excellent resistance to weathering, ozone, and UV exposure, and good resistance to polar chemicals, acids, and alkalis. Meeting ASTM D2000 M1AA507, this grade carries a documented material classification supporting procurement and engineering applications that require a traceable specification. The material is REACH compliant, RoHS compliant, and California Proposition 65 compliant, and is manufactured in the USA.
What differentiates 50 Durometer Butyl (IIR) Sheet from the 40 Durometer, 60 Durometer, and 70 Durometer grades?
50 Durometer Butyl (IIR) Sheet delivers the highest tensile strength (1100 psi) and elongation (450%) in the Butyl (IIR) Sheet line at a medium-soft 50 Shore A durometer. 40 Durometer Butyl (IIR) Sheet is the softest grade with maximum conformability for low-load applications. 60 Durometer Butyl (IIR) Sheet is the mid-range grade carrying ASTM D2000 M1AA607 specification, and 70 Durometer Butyl (IIR) Sheet is the firmest grade for high-load, high-compression sealing applications.
Why does 50 Durometer Butyl (IIR) Sheet have higher tensile strength than the firmer 60 and 70 Durometer grades?
Tensile strength in rubber compounds is a function of polymer formulation and compounding, not hardness alone. The 50 Durometer compound is formulated with a higher filler loading and polymer blend optimized for tensile and elongation performance, which produces higher mechanical properties even at a softer durometer than the 60 or 70 Durometer grades.
What is the service temperature range for 50 Durometer Butyl (IIR) Sheet?
The service temperature range is -40 to +180°F, as listed on the Technical Datasheet.
What chemical resistance properties does Butyl (IIR) rubber provide?
Butyl rubber offers excellent resistance to polar chemicals, dilute acids, alkalis, and ketones, as well as inherently low gas and vapor permeability. It is also highly resistant to weathering, ozone, and UV exposure. Butyl rubber is not recommended for petroleum oils, gasoline, or non-polar hydrocarbon solvents.
How should 50 Durometer Butyl (IIR) Sheet be specified?
Specify grade (50 Durometer Butyl (IIR) Sheet), thickness, ASTM D2000 M1AA507 if required by design documentation, compliance requirements, dimensional tolerances, and finished format.
