Sodium Hydroxide 1kg

Rated 4.9 out of 5
Based on 48 reviews
Regular price $25.00 Incl. GST
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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.

Sodium hydroxide or Caustic soda is used to convert fats and oils to soap. Sodium hydroxide is traditionally used to make harder soaps that dissolve less easily than those made using Potassium hydroxide. Despite both being called 'Lye' Sodium Hydroxide and Potassium Hydroxide are not interchangeable in soap recipes.

Sodium 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.


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.

average rating 4.9 out of 5
Based on 48 reviews
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96% of reviewers would recommend this product to a friend
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48 Reviews
Reviewed by Mary K.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Well packaged

Arrived quick and was very safely and well packaged. No issues with freighting the hazardous substance, Pure Nature took care of all that stuff.


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Reviewed by Anna A.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Works well for soap

Really well packaged and works well for soap making.

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Reviewed by Cheryl K.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Sodium hydroxide

Excellent in my soap making

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