195 an ISO 9001: 2015 certified company | PRICES EXCLUSIVE OF TAXES | For products listed on this page use HSN code 70179090 Some precipitates that clog the filter may be removed by chemical cleaning, as indicated below: Ÿ Fats and grease Carbon tetrachloride or suitable organic solvent Ÿ Albumen glucose: Hot ammonia or hydrochloric acid, mixture of hot concentrated sulphuric and nitric acids Ÿ Organic substances : 'Chromic' acid cleaning solution* or concentrated sulphuric acid containing a little potassium nitrate or perchlorate (0.5%) (may need to be soaked overnight) Ÿ Copper or iron oxide : Hot concentrated hydrochloric acid with potassium chlorate. Ÿ Barium sulphate : Hot concentrated sulphuric acid Ÿ Mercury Residues : Hot concentrate nitric acid Ÿ Mercury Sulphide : Hot aqua regia Ÿ Silver chloride : Ammonia or sodium hyposulphite Ÿ Stannic oxide : Boiling sulphuric acid** Alumina or silica residues : 2% hydrofluoric acid followed by concentrated sulphuric acid. Rinse immediately with distilled water and then with acetone. Continue rinsing until no trace of acid remains. High concentrations of hydrofluoric acid, hot phosphoric acid or caustic alkali solutions should never be used for cleaning. Using these causes a rapid deterioration in the filter and an increase in pore size. * For bacteriological, pharmaceutical and biological work, 'chromic' acid cleaning solution should be avoided in view of the biological effect of chromium ions. ** Boiling sulphuric acid may introduce undue thermal strain. It is therefore advisable to leave the item in the acid to cool. Cleaning Of Sintered Ware New Sintered Filters should be washed carefully with hot hydrochloric acid, and then rinsed with distilled water before use. Such treatment ensures that all loose particles are removed from the Filter. It is advisable to clean all Sintered Filters thoroughly, immediately after use, as cleaning is easiest at this time, and it also reduces the risk of contamination in the next use. Many precipitates can be removed from the filter by back-flushing with water. However, great care must be taken with large diameters and fine filters, as positive pressures on the reverse side may break the filter. Under no circumstances should Sintered Apparatus be subjected to mains water pressure when back-flushing, as in most instances this leads to fractured filters. Drawing water through the filter from the reverse side, by means of a vacuum pump, is also effective. Filters clogged with dust and dirt during gas filtration can be restored by treatment with warm detergent solution, followed by blowing clean air through, from the clean side of the filter. Dirt particles are brought to the surface by the foam, and removed by rinsing with water. 19 an ISO 9001:2015 certified company 185 Sintered Ware
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