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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.