LAIRD PP-4
Harmonization Code : 3824.99.92.97 | Prepared binders for foundry molds or cores; chemical products and preparations of the chemical or allied industries (including those consisting of mixtures of natural products), not elsewhere specified or included: other : other : other
Main features
- 1.06 Low-Loss Dielectric Constant
- 0.0001 Loss Tangent
- Heat-Sealable Closed-Cell Foam
Product Description
Eccostock PP-4 Low-Loss Polyethylene Foam is a flexible, closed-cell cross-linked foam for dielectric spacing, electromagnetic transparency, and thermal insulation. The PP-4 grade combines a typical dielectric constant of 1.06 with a 0.0001 loss tangent and 0.064 g/cc density. It returns toward its original thickness after compression and can be heat sealed into blocks or contoured forms. The material also offers low water absorption and practical weather resistance for lightweight fabricated structures. Applications include radomes, radar-transparent blankets and covers, electrical and microwave structures, antenna spacers, and selected buoyancy components.
Key features
- Stable Low-Loss Dielectric: A 1.06 dielectric constant and 0.0001 loss tangent support electromagnetic transparency.
- Flexible Closed-Cell Construction: Cross-linked polyethylene foam can be compressed, contoured, and heat sealed.
- Lightweight Thermal Insulation: Low density is combined with 0.042 W/(m K) typical thermal conductivity.
Applications / Suitable for
- Radomes, blankets, and radar-transparent coverings
- Electrical and microwave structures
- Antenna spacers and selected buoyancy components
TDS, SDS & Technical Documents
Technical Specifications
Thermal Properties
Mechanical Properties
General Properties
Additional Information
As-supplied / before-processing properties
Typical as-supplied mechanical and physical properties for the Eccostock PP-4 foam grade.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Construction | Closed-cell cross-linked polyethylene foam | Eccostock PP-4 | |
| Density | 0.064 | g/cc | Typical PP-4 value |
| Hardness | 15 | Shore A | Typical PP-4 value |
| Compression strength at 25% | 70 | kPa | Typical PP-4 value |
| Compression strength at 50% | 150 | kPa | Typical PP-4 value |
| Tensile strength | 5.5 | kg/cm^2 | Typical PP-4 value |
| Elongation | 290 | % | Typical PP-4 value |
After-processing / final-state properties
Typical PP-4 dielectric, thermal, and compression properties for the foam in its applied or in-use state.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Temperature range | -80 to 85 | deg C | Typical PP-4 range |
| Dielectric constant | 1.06 | Typical PP-4 value | |
| Loss tangent | 0.0001 | Typical PP-4 value | |
| Thermal conductivity | 0.042 | W/(m K) | Typical PP-4 value |
| Compression set | 16 | % of original thickness | Typical PP-4 value |
| Water absorption | 0.04 | g/cm^2 | Cut surface |
