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more information of light weight bricks machinery ,foam generator,foaming agent we are manufacturers of foam generator for 4 years contact us for low cost visit: www.sourceinfratech.com contact:9966871942 Test on cement before making a clc block or brick 1)cement should be greenish gray 2)freshness 3)check the manufacturing date on the bag it is printed in week/month/year it should not be more than 30 days old 1 month old -> 100 strength 3month old ->75% strength 6 month old->50% strength 1year old->no strength 4)smoothness test :- it should be cool when hand is trusted into a bag of cement 5)floating tes:- when a handful of cement thrown into a bucket of water,it should be float up to some time then gradually sinks to bottom 6)lump tes-: it lumps are found in the cement bag ,it should be powder by pressing with fingures if it does not tu