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Other Names: Caustic, caustic soda, lye, sodium hydroxide, aqueous
Formula: NaOH
Sp. Gr.: 1.1 for 10% concentration, 1.4 for 50% concentration
Viscosity: From water-thin to 40 cPs. depending on concentration and temperature
Remarks: Sodium hydroxide is a white, crystalline hygroscopic solid. It is soluble in water, alcohol and glycerol. It is used in the manufacture of other chemicals, rayon and film, petroleum refining, pulp and paper, making of aluminum, refining vegetable oil, in detergents, soaps, textile processing, in reclaiming rubber and as an alkali in foods. Causes severe burns to skin and eyes.
Pump Notes: Concentrations up to 50% can usually be handled with cast iron construction. Elastomer recommendation depends on concentration and ranges from buna n to PTFE or Kalrez®.
Kalrez® is a registered trademark of DuPont Dow Elastomers®, L.L.C.