MI Spec > Appendices > Appendix B

Fibreglass with Foil Scrim Vapour Retarder


Fibreglass insulation is available in board and block form, capable of being fabricated into pipe covering and various shapes. Low to medium temperature equipment and rectangular duct applications are common. A low skill level is required for flat products over pipe insulation. Note that the binder may break down at high operation temperatures.

Fibreglass has good structural strength, but poor impact resistance. It is non-combustible, non-absorptive and resistant to many chemicals. It has low water vapour permeance and does not support fungus or mould according to ASTM C1338-96.

Physical Properties

Installed Cost Ref Density Max Temp Thermal Conductivity
Low 40 kg/m3 232ºC 0.04 – 0.08 W/m*ºK
UV Resistance Flame Spread Smoke developed Compressive Strength
Low 25 50 Moderate to low

Back to Appendix B

Scroll to Top
Scroll to Top