4# ClipFoam™
ClipFoam™ 4# is a closed cell, crosslinked polyethylene foam with a density of 4 pcf and a compression deflection of 5.7 psi at 25% deflection. It maintains a compression set of 15.9% at 50% deflection per ASTM D3575 and is rated for excellent chemical resistance. Available in black or white with a single-coated permanent or removable adhesive, it is suited to weatherproofing, gasketing, shock absorption, insulation, and sound damping applications.
Key Properties
- Compression Deflection @ 25%: 5.7 psi (ASTM D3575)
- Compression Set @ 50% Deflection: 15.9% (ASTM D3575)
- Tensile Strength, Machine Direction: 159.9 psi (ASTM D3575)
- Tensile Elongation, Machine Direction: 317% (ASTM D3575)
- Density: 4 pcf
Chemical Resistance: Excellent
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- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Thickness | 1/16″, 1/8″, 1/4″ | — |
| Color | Black, White | — |
| Material/Substrate | Crosslinked Polyethylene Foam | — |
| Density | 4 pcf | — |
Mechanical Properties
| Property | Value | Test Method |
| Compression Deflection @ 25% | 5.7 psi | ASTM D3575 |
| Compression Set @ 50% Deflection | 15.9% | ASTM D3575 |
| Tensile Strength, Machine Direction | 159.9 psi | ASTM D3575 |
| Tensile Elongation, Machine Direction | 317% | ASTM D3575 |
| Tear Strength, Machine Direction | 18.7 lb/in | ASTM D3575 |
Chemical Resistance
| Property | Value | Test Method |
| Chemical Resistance | Excellent | — |
Flame & Fire Performance
| Property | Value | Test Method |
| Flame Retardant | Flame retardant by special request | — |
- Weatherproofing seals and gaskets in building, fenestration, and enclosure assemblies requiring a durable, mid-density closed cell foam
- Shock and vibration damping pads in consumer and light industrial products
- Sound absorption and insulation components in cleanroom drywall installation and acoustical ceiling tile gasketing
- Glass separator pads, bumpers, and shims in glazing and panel handling applications
- Glazing tape applications where a smooth, closed cell polyethylene foam with adhesive coating is specified
Common industries: construction, glazing, electronics, consumer goods, HVAC, acoustics.
ClipFoam™ 4# is a closed cell, crosslinked polyethylene foam with a density of 4 pcf, occupying the mid-density position between the 2# and 6# grades in the crosslinked polyethylene series. It is designed for resilient, multi-purpose applications including weatherproofing seals, gaskets, shock and sound absorption, thermal insulation, vibration damping, and use as glazing tape or glass separators. It is available with a single-coated permanent or removable adhesive in black or white.
The material exhibits excellent chemical resistance and is characterized by a smooth, flexible surface suited to die-cutting and converted formats. Tensile strength in the machine direction is 159.9 psi and tensile elongation in the machine direction is 317%, both per ASTM D3575. Tear strength in the machine direction is 18.7 lb/in per ASTM D3575. A flame retardant formulation is available by special request.
What differentiates the 4# ClipFoam™ from the lower-density 2# and higher-density 6# grades?
The 4# ClipFoam™ is a mid-density grade at 4 pcf with a compression deflection of 5.7 psi at 25% and a notably lower compression set of 15.9% compared to the 2# grade's 31%. Its tensile strength of 159.9 psi (MD) is substantially higher than the 2# (69 lb/sq-in MD), making it a stronger, more dimensionally stable foam. The available thickness range of 1/16"–1/4" is narrower than the 2# range.
Why is compression set important for a closed cell polyethylene foam?
Compression set measures how much permanent deformation the foam retains after being held under load. The 4# ClipFoam™ has a compression set of 15.9% at 50% deflection per ASTM D3575 — lower than the 2# grade's 31% — indicating better long-term recovery under sustained clamping or sealing loads. This is relevant for gasket and weatherproofing applications where maintaining a consistent sealing force over time is required.
What is the service temperature range for the 4# ClipFoam™?
A specific service temperature range is not stated on the manufacturer's TDS for this grade.
Is the 4# ClipFoam™ suitable for flame-rated environments?
A flame retardant version is available by special request, as stated on the TDS. No specific flame rating or standard is listed on the TDS for the standard grade.
How should the 4# ClipFoam™ be specified?
Specify grade (4# ClipFoam™), thickness, color (Black or White), adhesive type (permanent or removable, if applicable), compliance requirements if applicable, dimensional tolerances, and finished format.
