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- 1. impervious
- impervious : An impervious paint system is one which will prevent the passage of moisture or moisture vapour.
- 2. inert pigments
- inert pigments : Materials which are resistant to attack by chemicals normally encountered in the environment in which they will be used e.g. atmospheric pollution.
- 3. insulation board
- insulation board : Commonly refers to soft fibre board but can also be used for similar boards of any composition.
- 4. intumescence
- intumescence : To swell enlarge or expand when exposed to heat. Many fire retardant materials have this property.