Caustic Soda/Sodium Hydroxide 99% (Pearl)

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Caustic Soda/Sodium Hydroxide 99% (Pearl)Caustic soda (sodium hydroxide) is a versatile alkali. Caustic soda is an on

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Caustic Soda/Sodium Hydroxide 99% (Pearl)

Caustic soda (sodium hydroxide) is a versatile alkali. Caustic soda is an essential ingredient in an array of industrial applications. Its main uses are in the manufacture of pulp and paper, alumina, soap and detergents, petroleum products, and chemical production. Other applications include water treatment, food, textiles, metal processing, mining, glass making, and others.


Reliable Supply

KEMCORE is always prepared to fulfill orders as they're placed and deliver the product customers need.

Commitment to Safety

KEMCORE has been safely and responsibly distributing Caustic Soda (Pearl form) for decades and continues to make advancements through improved packaging options, on-site unloading services, and comprehensive training for our customers.

Dedicated Support

Whether it’s assisting with Caustic Soda handling or regulatory needs like licensing, permitting, and compliance monitoring, support is available.


  • China
  • Russia

Synonyms: Caustic soda lye, White Caustic sodium hydroxide, Caustic Soda pearl, Sodium Hydroxide Perlen, Caustic soda, ionic exchange membrane solid, Sodium hydroxide pearl, Caustic soda, Sodium hydroxide, Pearl caustic, Caustic soda solid, Caustic Soda Pearls.

Molecular Formula: NaOH

CAS Number: 1310-73-2

Physical Properties

Appearance: White, orthogonal crystals

Form: Colorless to white ... solid (beads, granular form).

Odor: Odorless

Boiling point: 1,388 °C

Melting/freezing point: 318 °C

Specific gravity: 2.13 @. 20°C

Flashpoint: Non-flammable

pH: 12.7 (1% aqueous solution)

Recommended use: Elution stripping of gold adsorbed onto activated carbon

Other uses: Caustic soda (sodium hydroxide) is a versatile alkali. Caustic soda is an essential ingredient in an array of industrial applications. Its main uses are in the manufacture of pulp and paper, alumina, soap and detergents, petroleum products, and chemical production.

In gold processing, strongly alkaline conditions are needed in the stripping of loaded carbon with cyanide solution. This is because caustic soda provides protective alkalinity that stabilizes the cyanide complex and prevents the formation of hydrogen sulfide during its use. This stage involves treating the carbon with a caustic-cyanide solution at high temperature (115°C) and pressure (230 kPa). The sodium cyanide is required for solubilizing the adsorbed gold cyanide complex and the caustic (sodium hydroxide) is added to maintain a high pH to minimize the evolution of HCN gas.

Elution stripping of gold adsorbed onto activated carbon- Elution involves feeding the carbon into a special pressure vessel called a column. The carbon is pumped to the column and the water is drained. A mixture of caustic soda and cyanide is pumped through the column to contact the carbon. This mixture extracts the gold from the carbon to make a concentrated solution of gold. These parameters are the temperature, the flow rate of the elution, the pH (or the free caustic soda strength).

The advantage of using caustic soda lies in its purity which ensures that not much ‘junk’ material is introduced into the system when correcting the pH. Consistency in the specification of the product also ensures process predictability.

Method of Application

Several methods are used to strip loaded activated carbon of gold. These include Alcohol Stripping, Pressurized or Atmospheric Zadra Stripping, and the Micron Elution Procedure.

In these processes, gold that is adsorbed on the carbon is desorbed by the reversal of the adsorption reaction. The gold, now back in solution is then recovered on wire-wool in electrowinning cells. The solution used to strip the carbon normally contains 1% sodium hydroxide and 0.1% sodium cyanide solution. Variable parameters used in the various stripping technologies include stripping temperatures and pressures as well as the solution concentrations being used.

Product application

Synonyms:           Glacial acetic acid; Acetic acid solution; acetic acid 50%;  acetic acid, of a concentration of more than 10 per cent, by weight, of acetic acid; Acetic Acid Glacial BP; Natural Acetic Acid; Acetic acid (36%); Acetic acid, food grade; Acetic Acid Glacial; GAA; Acetic Acid, Glacial 

It is a colourless liquid that when undiluted is also called glacial acetic acid. It has a distinctive sour taste and pungent smell.

Acetic acid uses:  
Additive in industrial explosives in Mining.

Other uses include use of acetic acid in the production of vinyl acetate monomer,  acetic anhydride and ester production. 


Chemical gassing agents -In the case of emulsion explosives, using Acetic acid can accelerate the gassing process. The chemically gassed emulsions may take 40 – 50 minutes for completion of gassing within the blast holes, particularly when the emulsion is colder.

In cases where acetic acid is used, it is added to the emulsion prior to gassing, the desired amount of acid is mixed in the emulsion, before adding the gasser.

A gassing solution comprising sodium nitrite in water together with the selected enol compound and acetic acid is introduced into the emulsion explosive at the blast hole by entraining the gassing solution into a stream of the emulsion explosive using pumps.

The solution pH is an important parameter in the gassing of emulsion explosives due to the high cost associated with acid addition therefore a pH value should preferably be maintained at 4.1 or below.

Product composition




CAS number








EC number


UN number



Molecular formula


Molar mass

60.05 g mol


Colourless liquid




1.049 g cm

Melting point

16 to 17 °C; 61 to 62 °F; 289 to 290 K

Boiling point

118 to 119 °C; 244 to 246 °F; 391 to 392 K

Solubility inwater


Acidity (pKa)


Basicity (pKb)

9.198 (basicity of acetate ion)

Refractive index(nD)



1.22 mPa s

Dipole moment

1.74 D



Product handling


  • Transport-UN 2789
  • Hazard Class No. : 8
  • Packing Group: II
  • H.S. Code:  2915211900



-        Stable at room temperature in closed containers under normal STORAGE & HANDLING and handling conditions.  Refer to SDS sheet 



Packing type


IBC Drums


30kg Drums


200Kg drums



4.Environmental impact


-       Acetic acid biodegrades readily under both aerobic and anaerobic conditions.

 -        Acetic acid does not absorb light with wavelengths >290 nm(4), and is not expected to be susceptible to direct photolysis by sunlight(SRC).

-        Incase of spillage neutralize spill with soda ash or lime.

5. Download our Acetic acid msds for more handling information.