MI Spec > Appendices > Appendix B

Elastomeric Insulation


Elastomeric insulation is produced from foaming plastic resins to create predominately closed cellular rigid materials, providing lower thermal conductivity. It is light-weight with excellent cutting characteristics. Available in pre-formed shapes including tube and boards, it is generally used in the lower intermediate and the entire low temperature ranges, for example in heat preservation of central air-conditioning systems, chilled water pipes, condensate pipes, air ducts and hot-water pipes of HVAC equipment. It is the preferred material for low temperature pipes because of the moisture-proof property.

While it has fire retarding capabilities, it is important to keep in mind that it is a plastic material.

Also note that thermal resistance declines and thermal conductivity increases after initial use as the gas trapped within the cellular structure is eventually replaced by air.

Physical Properties

Installed Cost Ref Density Max working temp Thermal Conductivity
Medium (more expensive than polyethylene) 55 kg/m3 125ºC .03 W/m*ºK
UV Resistance Flame Spread Smoke Developed Compressive Strength
Typically poor, however light stabilized materials perform better 95 Over 50 < 480 kPa (or <70 PSI)

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