1. The amount of water absorbed by a material under specified test conditions; expressed as weight percent of the test specimen. 2. The amount of water ingested into the core and surface papers of gypsumboard; expressed as a percent of water added over dry weight.

Water absorption will degrade an insulation's thermal resistance and possibly its structural integrity, and it will increase its weight. A rigid foam insulation's resistance to water absorption is verified C272. ISO-C1's (polyisocyanurate) water absorption is an excellent 0.24%, and will not degrade its thermal resistance or structural integrity over the life of the product. ISO-C1's water absorption characteristics are comparable to extruded polystyrene which is often used in surfboards and flotation devices.

by weight water absorbed by material in 24 Hours @ RT

Ratio of weight of water absorbed by a material to the weight of dry material. Also called moisture content.

is the amount of water a specimen picks up on total immersion in water over a specified time. Water absorption is usually expressed as lbs.-water / ft of foam or as percent of the total foam weight. (ASTM D2842)

Ratio of the weight of water absorbed by an adhesive to the weight of the same material in a dry condition.

The water absorption factor is a measure of a tile or stone's porosity. For example a stone with a WA factor of 6% means that if immersed in water until saturated, it will absorb an amount of water equal to 6% of its' own dry mass. 6 % is very porous; a typical quarry tile may have a WA factor of around 2% where as porcelain tiles may be closer to 0.05

Water by percent weight absorbed by a material after a given immersion period.

The increase in weight and volume after immersion in water.

The amount of water absorbed by a material after being immersed for a prescribed period of time. It may be expressed as a percentage of the original weight of the material.

The amount of water that a unit absorbs when immersed in either cold or boiling water for a stated length of time; expressed as a percentage of the weight of the dry unit.

The increase in weight of a test specimen expressed as a percentage of its dry weight after being immersed in water for a specified time at a given temperature.

the percentages by weight or water absorbed by a sample immersed in water. Dependent upon area exposed, and the time of exposure.

The amount of water taken up by a material under specified test conditions commonly expressed as weight percent of the test specimen.

The ratio of the weight of water absorbed by a given material under specified conditions, to the weight of that material when dry. It is generally expressed as a percentage.

The ability of a material to take up and retain water.