Specification:Making job-prepared hypochlorite

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=GENERAL=

SUMMARY
 This standard includes guidance on making job-prepared hypochlorite for use in removing specific stains from concrete. It is recommended for use in removal of the following stains:  Beverage Stains: See 03710-06-R. Fire, Smoke, Soot, Pitch and Wood Tar Stains: See 03710-19-R. Urine Stains: See 03710-38-R. Wood Stains: See 03710-42-R.    =PRODUCTS=

MATERIALS


Calcium Hypochlorite (CaCl2O2):  A white powder used especially as a bleaching agent and disinfectant.</li> Other chemical or common names include Chlorinated calcium oxide; Bleaching powder*; Calcium oxymuriate*; Chloride of lime*; Chlorinated lime*; Hypochlorite of lime*; Oxymuriate of lime*.</li> Potential Hazards: CORROSIVE TO FLESH; FLAMMABLE (WHEN IN CONTACT WITH ORGANIC SOLVENTS).</li> Available from chemical supply house, dry cleaning supply distributor, drugstore or pharmaceutical supply distributor, janitorial supply distributor, swimming pool supply distributor, or water and sanitation supply distributor.</li> </ol> </li> Sodium Orthophosphate:  Other chemical or common names include Tribasic sodium phosphate; Trisodium orthophosphate; Trisodium phosphate; TSP*; Phosphate of soda*.</li> Potential Hazards: CORROSIVE TO FLESH.</li> Available from chemical supply distributor, supermarket, grocery, or hardware store.</li> </ol> </li> Clean, potable water</li> </ol>

EQUIPMENT
<ol type="A"> Enameled shallow pan</li> Rubber or plastic buckets or stoneware jar</li> </ol> =EXECUTION=

ERECTION, INSTALLATION, APPLICATION
<ol type="A"> Dissolve 2 pounds of sodium orthophosphate crystals in 1 gallon of hot water in a rubber or plastic bucket.</li> In a shallow enamel pan, place 12 ounces by weight of calcium hypochlorite. Add water slowly and mix to a paste while mashing the lumps.</li> Pour the two solutions into another rubber or plastic bucket or into a stoneware jar and mix in enough water to make a total of 2 gallons of solution.</li> <li>Stir well, cover and allow the lime to settle.</li> <li>Carefully pour off the liquid for use, leaving the solids behind. The liquid can be siphoned off, but do not start the suction by mouth.</li> </ol>