As per BS EN 14617-1, water absorption can be tested as follows specially Agglomerated stones:
Water absorption is maximum amount of water absorbed by the material when soaked in deionised water at room temperature and pressure according to the procedure described below, expressed as a percentage of the dry mass of the sample.
Specimen of 6 No's of 100 x 100) mm length and width and (10 ± 2) mm thickness.
Dry the specimen at 70 ± 5°C for 24 Hrs and cool them at 20 ± 5°C.
Place the specimens in a tank on two supports in order to reduce the support contact surface to a minimum area.
Slowly pour the deionised water into a container until the specimens are completely immersed and covered by 2 cm of water. After (1 ± 0,25) h, (8 ± 0,5) h and (24 ± 1) h from the beginning of the tests, and later at regular intervals of (24 ± 1) h, take the specimens out of the water, wipe with a damp cloth and weigh them in air.
Continue to immerse the specimens in water and repeat the tests until the weight the specimens.
Find out the water absorption in % using the below formula:
Mo - is sample mass weighed in air after drying, in kilograms
Mt - is sample mass soaked in water (6), wiped by a damp cloth and weighed in air, in kilograms.
From these values, we can decide the subsequent application product nature, Ex.. the material used to bond should have water retention strength, Coverage of top coating material, Spreadability of the material, Stain catching time, Cleaning time, etc.
One more popular test to find out the water absorption is one minute COBB test. Let see the testing process:
As per ASTM C 570, water absorption can be tested as follows for Plastics and other type of sheet membranes:
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