Potassium Hydroxide

Rated 5.0 out of 5
2 Reviews
(Incl. GST)

  • Description
  • Safety
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Lye is a crucial part of hot and cold process soap making. When combined with a fat and water, the magic of saponification occurs and soap is created. Using the correct type and amount of lye is correct.
To work out how much to use in our recipe use our free online Soap Calculator.

Potassium hydroxide or Caustic Potash is used to convert fats and oils to soap. Potassium hydroxide is traditionally used to make softer soaps that dissolve more easily than those made using Sodium hydroxide. Despite both being called 'Lye' Potassium Hydroxide and Sodium Hydroxide are not interchangeable in soap recipes.
This product comes as a 90% pure flake.

Potassium hydroxide is a highly corrosive dangerous good. This means it requires special handling by our shipper which can cause a delay in the delivery of your order.

As Potassium hydroxide is a dangerous good, it also incurs a $10.00 delivery surcharge from our shipper, this will be added to your freight bill at checkout.

Unfortunately, this charge is unavoidable by us and so will be passed on even if you spend over the freight free threshold. However, should your order total exceed $120.00, our standard courier charge of $7.95 will still be waived.

Product Name: Sodium Hydroxide (Caustic Soda)

CAS No.: 1310-73-2

HS Approval # HSR001547

HSNO Classification: 6.1D (All), 6.1D (O), 6.1D (D), 8.1A, 8.2B, 8.3A, 9.1D (All), 9.1D (F), 9.1D (C), 9.3C

Harmful if swallowed. Harmful in contact with skin. Harmful if inhaled.                   

Toxic to aquatic life. Harmful to aquatic life. May cause long lasting harmful effects to aquatic life.    

Harmful to terrestrial vertebrates. May be corrosive to metals.


Keep out of reach of children. Read label before use. Read safety data sheet before use.

Keep only in original container. Wash hands and exposed skin thoroughly after handling.

Do not breathe dust. Avoid breathing dust. Do not eat, drink or smoke when using this product.

Use only outdoors or in a well-ventilated area. Wear appropriate personal protective equipment when handling including eye protection and gloves Avoid release to the environment.


If medical advice is needed, have product container or label at hand.

Absorb spillage to prevent material damage.

IF SWALLOWED:  Rinse mouth.  Do NOT induce vomiting. Immediately call a POISON CENTER or doctor/physician.

IF ON SKIN (or hair):  Remove/Take off immediately all contaminated clothing.  Rinse skin with water/shower. Wash with plenty of soap and water. Wash contaminated clothing before reuse.

IF IN EYES:  Rinse cautiously with water for several minutes.  Remove contact lenses, if present and easy to do.  Continue rinsing.

IF INHALED:  Remove to fresh air and keep at rest in a position comfortable for breathing.

Call a POISON CENTRE 0800 POISON (0800-764-766) if you feel unwell.


Store in a well-ventilated place.  Keep cool.

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2 Reviews
Reviewed by Marena L.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

I recommend Potassium Hydroxide

Another great product from Pure Nature.

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Reviewed by Deb
I recommend this product
Rated 5 out of 5
Review posted

5 Stars

Quick delivery and works well

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