2. INSULATION MATERIALS AND PROPERTIES

2.6 PROPERTIES OF PROTECTIVE COVERINGS

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The properties of jacketing and mastic materials that must be considered to meet the aforementioned functions are:

1. Chemical Compatibility

The chemical make-up of coverings must be compatible with the insulation material over which they are applied, as well as resistant to elements in the environment such as industrial chemicals, salt, air and ultraviolet or infrared light.

2. Resistance to Internal and External Movement

This property is significant if the covering must absorb or compensate for thermal expansion and contraction of the insulation it covers (i.e. shrinkage of high temperature insulation ) or if the system vibration must be considered.

3. Temperature Range of the Finish or Covering

The temperature range must be compatible with the surface temperature of the insulation surface.

4. Vapour Permeability

Permeability should be considered for below ambient or dual temperature systems. The covering should significantly reduce the passage of moisture through the insulation.

5. Fire Retardancy

Flame spread and smoke developed ratings are of vital importance.