Caustic Soda Solution 50% (Membrane Grade)

Overview

Caustic soda (sodium hydroxide, NaOH, CAS 1310-73-2) is a strong base used in the manufacture of pulp and paper, detergents, textiles and other products. The 50% liquid membrane-cell grade is the common bulk commercial form. Typical published producer specification ranges: NaOH 49.5-51.5 wt%, sodium carbonate (Na2CO3) 0.10 wt% max, sodium chloride (NaCl) about 100 ppm max, iron (Fe) about 3-4 ppm max, sodium chlorate and sulfate in the tens of ppm; exact limits vary by producer and lot. The solution has a density of about 1.52 g/cm3 at 20°C and begins to crystallise at about 12°C (54°F), so storage and transfer lines should be kept above that temperature. Typical uses include boiler systems, drilling, metal cleaning, pesticide production, pH adjustment and water conservation. It is corrosive (UN 1824, Class 8): it causes severe skin burns and eye damage, reacts exothermically with water and acids, and attacks aluminium, zinc and tin; use chemical-resistant gloves, face shield and protective clothing and follow the producer SDS. Please request the producer certificate of analysis and SDS through the RFQ.

Specifications

Base Type

Sodium hydroxide (NaOH) 50% aqueous solution, membrane grade

Service Temperature

N/A

Technical Information

• NaOH 49.5-51.5 wt% typical; Na2CO3 0.10% max; NaCl about 100 ppm max
• Density about 1.52 g/cm3; crystallises at about 12°C (54°F)
• Corrosive, UN 1824 Class 8; request COA and SDS via RFQ

Typical Applications

• pH control and neutralisation in water treatment and boiler systems
• Pulp and paper, detergent, soap and textile processing
• Metal cleaning, drilling fluids and chemical or pesticide manufacture

Industries

Technical Documents