... ELHOV-PETROLEUM OS Tatneft The petroleum and water values absorptions are found too. The possibility of increasing of sorbet materials of waterproof properties by processing with solutions of acids is studied. It is shown, that updating by acids promotes water absorption decrease. The methods of infrared-spectroscopy and electronic microscopy show that processing by acids leads to the structure and surface changes of materials. I.G.SHAYHIEV R.KH.NIZAMOV S.V.STEPANOVA И.Г.ШАЙХИЕВ Р.Х....

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