3140 Open Cell Natural Rubber
3140 is a firm open cell natural rubber foam with an average density of 33 lb/ft³ and a compression deflection of 16–22 psi at 25%. It is rated for service from -20°F to 160°F and exhibits a compression set of 15% at 50% deflection at 158°F. The material is black, available in thicknesses from 1/16″ to 1/4″, and features anti-slip, high-friction surface properties and exceptional abrasion resistance.
Key Properties
- Compression Deflection @ 25%: 16–22 psi (ASTM D1056)
- Compression Set @ 50% Deflection @ 158°F: 15% (ASTM D1056)
- Density (Average): 33 lb/ft³ (ASTM D1056)
- Compression Deflection Change After Oven Aging 168 Hours @ 158°F: ±20% (ASTM D1056)
- Temperature Range: -20°F to 160°F
- Abrasion Resistance: Yes
We want to help!
Enter your information and we'll get you in touch with our knowledgable staff. We know how important to the right product for your project.
Request a Consultation
- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Polymer | Natural Rubber | — |
| Cell Structure | Open Cell | — |
| Color | Black | — |
| Density (Average) | 33 lb/ft³ | ASTM D1056 |
| Temperature Range | -20°F to 160°F | — |
| Abrasion Resistance | Yes | — |
Mechanical Properties
| Property | Value | Test Method |
| Compression Deflection @ 25% | 16–22 psi | ASTM D1056 |
| Compression Set @ 50% Deflection @ 158°F | 15% | ASTM D1056 |
Aging Performance
Oven Aging @ 168 Hours @ 158°F
| Property | Value | Test Method |
| Compression Deflection Change After Oven Aging 168 Hours @ 158°F | ±20% | ASTM D1056 |
- Heavy-duty cushioning pads requiring high firmness and resistance to compression under sustained load
- Anti-slip and isolation pads in material handling, equipment mounting, and industrial assembly applications
- Vibration damping components where firm compression resistance is required to control deflection amplitude
- Laminated assemblies combining firm natural rubber foam with textiles or cork for composite protection products
- Protective and spacing pads in glazing, construction, and structural isolation applications
Common industries: Industrial Manufacturing, Material Handling, Construction, Glazing and Glass.
3140 is a firm grade in the open cell natural rubber foam range, with an average density of 33 lb/ft³ and a compression deflection of 16–22 psi at 25% per ASTM D1056. It is designed for cushioning applications where high firmness is required — providing significantly greater load-bearing resistance than the 3110, 3120, and 3130 grades while being slightly softer than the extra firm 3150 grade. It is suited for heavy-duty cushioning, isolation, and vibration damping applications where a high compression resistance is the primary requirement.
The material exhibits anti-slip properties and a high coefficient of friction alongside excellent resistance to abrasion and tearing, and is compatible with lamination to textiles and cork. Compression set is 15% at 50% deflection at 158°F per ASTM D1056, and compression deflection change after oven aging at 168 hours at 158°F is ±20%. Temperature range is -20°F to 160°F.
What differentiates 3140 from 3130 and 3150 in the open cell natural rubber range?
3140 sits between the medium-firm 3130 (10–16 psi CFD, 30 lb/ft³) and the extra firm 3150 (22 psi CFD, 36 lb/ft³). At 16–22 psi CFD and 33 lb/ft³ average density, it provides a firm response for heavy-duty cushioning and isolation applications where the 3130 grade deflects excessively under load but the maximum firmness of 3150 is not required.
Why is compression deflection critical for open cell natural rubber foam selection?
Compression deflection at 25% defines the force required to compress the foam by a given amount under load — determining the material's working firmness. For heavy-duty cushioning, isolation, and vibration damping applications, a higher CFD means the foam resists deflection more strongly under load, preventing bottoming out and maintaining its functional geometry. 3140's CFD of 16–22 psi positions it for firm, high-load cushioning duties.
What is the service temperature range for 3140?
3140 is rated from -20°F to 160°F.
Is 3140 suitable for regulated environments?
No compliance standards are specified on the manufacturer's TDS for this material.
How should 3140 be specified?
Specify grade (3140 Open Cell Natural Rubber / H-O part number 3140NRUB), thickness (1/16", 1/8", 3/16", or 1/4"), lamination requirements if applicable, dimensional tolerances, and finished format.
