Sound absorption Conversion of sound energy into heat when passing through or striking a material or when causing a volume of air to resonate low = <0.45 medium = >0.45, <0.65 high = >0.65			Sound attenuation Term used in relation to the transmission of sound between rooms sharing a common plenum low = <30 dB medium = 30<dB<35 high = >35 dB			Light Reflectance Indicates the quantity of light reflected by a surface, expressed as a percentage value 1 = <75% 2 = 75<%<85 3 = >85%
	Fire performance All Armstrong ceilings (except Madera which is Class 1) provide Class 0/Class 1 against BS 476			Humidity Resistance Ceiling tiles ability to perform without sagging 1 = 70% 2 = 90% 3 = 95% 4 = 100%			Washability Occasional cleaning with moist cloth or sponge damped in water containing mild soap or diluted detergent
	Scrubbability For applications where cleanliness is a priority, tiles may require cleaning beyond normal maintenance procedures			High pressure water cleaning Can be cleaned using a high pressure water spray			Antimicrobial Offers specific performance against bacteria, mould and mildew
	Hygiene Suitable for areas, which have hygiene as a key requirement (food, health, pharmaceutical, computer industries)			Demountability Ceiling system where the access to the plenum is very easy			Durability Overall ability to withstand cleaning, scrubbing, scratching and impact
	Scratch resistance Superior level of surface scratch resistance, evaluated with the Hess Rake test			Impact resistance High level of impact resistance, evaluated with the Preston impact test			Weight Average weight kg per 1m2
	Thermal conductivity Ability of the material to resist heat transmission			Colours Available as coloured product			Dimension Length and width expressed in mm
	Edge detail Board, Tegular, MicroLook (BE), Vector, SL2, K2C2			Grid system Recommended Trulok suspension system