4130 Open Cell Natural Rubber
4130 is a medium firm open cell natural rubber foam with an average density of 30 lb/ft³ and a compression deflection of 10–16 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 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%: 10–16 psi (ASTM D1056)
- Compression Set @ 50% Deflection @ 158°F: 15% (ASTM D1056)
- Density (Average): 30 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
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Physical PropertiesMechanical Properties
| Property | Value | Test Method |
| Polymer | Natural Rubber | — |
| Cell Structure | Open Cell | — |
| Color | Tan | — |
| Density (Average) | 30 lb/ft³ | ASTM D1056 |
| Temperature Range | -20°F to 160°F | — |
| Abrasion Resistance | Yes | — |
| Property | Value | Test Method |
| Compression Deflection @ 25% | 10–16 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 |
- Cushioning pads requiring firm compression resistance and high friction in a tan-colored natural rubber
- Anti-slip and protective padding in industrial assembly, packaging, and material handling applications
- Vibration damping and shock absorption components where medium-firm compression resistance is required
- Laminated assemblies combining tan natural rubber foam with textiles or cork for composite cushioning products
- Isolation and spacing pads where firm load support and abrasion resistance are the primary requirements
Common industries: Industrial Manufacturing, Material Handling, Consumer Products, Construction.
4130 is the upper-medium firmness grade in the tan open cell natural rubber foam range, with an average density of 30 lb/ft³ and a compression deflection of 10–16 psi at 25% per ASTM D1056. It is designed for cushioning applications where a firm foam is required, providing greater load-bearing resistance than the 4110 and 4120 grades while remaining softer than the 4140 and 4150 grades. The tan color distinguishes it from the mechanically equivalent black 3130 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 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 4130 from 4120 and 4140 in the tan open cell natural rubber range, and from the black 3130?
4130 sits between the lower-medium 4120 (5–10 psi CFD, 26 lb/ft³) and the firm 4140 (16–22 psi CFD, 33 lb/ft³). At 10–16 psi CFD and 30 lb/ft³, it provides a firm cushioning response suited for load-bearing isolation and vibration damping where softer grades would deflect excessively. Compared to the black 3130 grade, mechanical properties are identical — the distinction is color, with 4130 supplied in tan.
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, defining the material's working firmness. For cushioning, isolation, and vibration damping applications, the correct CFD ensures the foam carries the expected load without excessive deflection or bottoming out. 4130's CFD of 10–16 psi positions it for firm, load-bearing cushioning duties in the tan range.
What is the service temperature range for 4130?
4130 is rated from -20°F to 160°F.
Is 4130 suitable for regulated environments?
No compliance standards are specified on the manufacturer's TDS for this material.
How should 4130 be specified?
Specify grade (4130 Open Cell Natural Rubber / H-O part number 4130NRUB), thickness (1/16", 1/8", 3/16", or 1/4"), lamination requirements if applicable, dimensional tolerances, and finished format.
