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

LAIRD PP-4

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
Product Family

LAIRD PP-4

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TDS, SDS & Technical Documents

Technical Specifications

Thermal Properties
Operating Temperature
(-) 80 to 85 °C
Thermal Conductivity
Thermal conductivity describes the ability of a material to conduct heat. It is required by power packages in order to dissipate heat and maintain stable electrical performance. Thermal conductivity units are [W/(m K)] in the SI system and [Btu/(hr ft °F)] in the Imperial system.
0.042 W/m.K
Mechanical Properties
Elongation
Elongation is the process of lengthening something. It is a percentage that measures the initial, unstressed, length compared to the length of the material right before it breaks. It is commonly referred to as Ultimate Elongation or Tensile Elongation at break.
290 %
General Properties
Density (g)
0.064 g/cm3

Additional Information

Technical properties

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
Technical properties

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

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