CAUSTIC SODA is the common name for Sodium Hydroxide (NaOH). CAUSTIC SODA is used primarily to increase and control pH in water-based fluids.
• Is a source of hydroxyl ion to increase and control pH.
• Provides pH control required for effectiveness of drilling fluid additives.
• Provides corrosion control through pH.
• May be used to precipitate hardness such as Mg++ at pH above 10.3.
as required (0.5-1.5 kg/m³ typical)
Caustic Soda (kg/m³) pH p-Alkalinity (mg)
0.70 7.5-8.0 Trace
1.00 8.5-9.0 0.1-0.25
1.45 9.5-10.0 0.3-0.50
2.20 10.0-10.5 0.5-0.70
2.90 11.0-12.0 0.8-1.00
5.80 14.0 3.0
8.70 14.0 5.0
11.6 14.0 7.0
Appearance: White beads
Specific Gravity: 2.13
Solubility: Soluble
pH: 13.0 (1% solution)