4150 Open Cell Natural Rubber
4150 is an extra firm open cell natural rubber foam with an average density of 36 lb/ft³ and a compression deflection of 22 psi at 25% — the highest firmness in the tan open cell natural rubber range. It is rated for service from -20°F to 160°F and exhibits a compression set of 40% at 50% deflection at 158°F. The material is tan, 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%: 22 psi (ASTM D1056)
- Compression Set @ 50% Deflection @ 158°F: 40% (ASTM D1056)
- Density (Average): 36 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
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- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Polymer | Natural Rubber | — |
| Cell Structure | Open Cell | — |
| Color | Tan | — |
| Density (Average) | 36 lb/ft³ | ASTM D1056 |
| Temperature Range | -20°F to 160°F | — |
| Abrasion Resistance | Yes | — |
Mechanical Properties
| Property | Value | Test Method |
| Compression Deflection @ 25% | 22 psi | ASTM D1056 |
| Compression Set @ 50% Deflection @ 158°F | 40% | 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 the maximum compression resistance in the tan open cell natural rubber range
- Anti-slip and isolation pads in demanding industrial, structural, and equipment mounting applications where tan color is required
- Vibration damping components where maximum stiffness and minimal deflection under high load are required
- Laminated assemblies combining extra firm tan natural rubber foam with textiles or cork for high-load composite products
- Protective and spacing pads where structural firmness, abrasion resistance, and tan color are required simultaneously
Common industries: Industrial Manufacturing, Construction, Material Handling, Consumer Products.
4150 is the firmest grade in the tan open cell natural rubber foam range, with an average density of 36 lb/ft³ and a compression deflection of 22 psi at 25% per ASTM D1056. It is designed for cushioning applications where the highest firmness is required, providing maximum load-bearing resistance and minimal deflection compared to all other grades in the tan range. The tan color distinguishes it from the mechanically equivalent black 3150 grade.
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 40% at 50% deflection at 158°F per ASTM D1056 — higher than the 15% recorded for grades 4110 through 4140 — reflecting the trade-off between maximum firmness and elastic recovery at the extreme end of the density range. Compression deflection change after oven aging at 168 hours at 158°F is ±20%. Temperature range is -20°F to 160°F.
What differentiates 4150 from 4140 and lower-firmness grades in the tan open cell natural rubber range, and from the black 3150?
4150 is the firmest grade in the tan range at 22 psi CFD and 36 lb/ft³ average density — matching the firmness profile of the black 3150 grade exactly, with tan color as the distinguishing characteristic. Its compression set of 40% at 50% deflection at 158°F is notably higher than the 15% recorded for grades 4110 through 4140, reflecting a trade-off between maximum firmness and long-term elastic recovery at the extreme end of the density range.
Why is compression deflection critical for open cell natural rubber foam selection?
Compression deflection at 25% determines how much force is required to compress the foam under load — it is the primary indicator of functional firmness. For applications requiring maximum resistance to deflection, the highest available CFD in the range is required to prevent the material from bottoming out under sustained or impact loads. 4150's CFD of 22 psi is the maximum firmness point in the tan open cell natural rubber range.
What is the service temperature range for 4150?
4150 is rated from -20°F to 160°F.
Is 4150 suitable for regulated environments?
No compliance standards are specified on the manufacturer's TDS for this material.
How should 4150 be specified?
Specify grade (4150 Open Cell Natural Rubber / H-O part number 4150NRUB), thickness (1/16", 1/8", 3/16", or 1/4"), lamination requirements if applicable, dimensional tolerances, and finished format.
