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Essentially Natural

Caustic Potash (Potassium Hydroxide, Liquid Soapmaking Lye) - Essentially Natural

Caustic Potash (Potassium Hydroxide, Liquid Soapmaking Lye) - Essentially Natural

Regular price R89.00
Regular price Sale price R89.00

3 in stock — ready to ship.

INCI: Potassium hydroxide

Essentially Natural Caustic Potash (Potassium Hydroxide) is a strong alkali used primarily as a lye for making liquid soap through saponification. It reacts with fats and oils to create liquid soap and is also used in specific formulation contexts where an alkaline material is required. This is a highly caustic raw material and must be handled with strict safety practices. It is intended for technical and formulation use only.

For more detailed instructions on how to use and handle Potassium Hydroxide safely we recommend reading this article .

Also you can read our blog on soap making .

This product is certified: Vegan and Beauty Without Cruelty.

Need detailed info? COAs and SDSs are available — just send us the product name and batch number, and we’ll gladly share them with you.
  • Ingredient Name: Potassium Hydroxide
  • Also Known As: KOH, potash, lye
  • Form: Solid alkali
  • Primary Function: Saponification for liquid soap making
  • Size Options: 500g, 1kg, 2kg or 5kg

    This product is commonly used to:

  • Make liquid soap by saponifying oils and fats
  • Adjust alkalinity in suitable technical formulations
  • Create potassium-based soap pastes for dilution into liquid soap
  • Support specialist soap recipes that require potassium hydroxide rather than sodium hydroxide

    This product is suitable for:

  • Experienced soap makers producing liquid soap
  • Formulators trained in handling caustic raw materials
  • DIY makers following a proven liquid soap recipe with safety controls
  • This product is not for:

  • Beginners without safety equipment and proper ventilation
  • Ready-to-use cosmetic applications
  • Any personal care use as-is
  • As a Liquid Soap Lye: Use in a properly calculated soap recipe and dissolve carefully in water before combining with oils.
  • Processing Tip: Work in a well-ventilated area and follow a trusted formulation method for accurate calculations.
  • Caustic, wear gloves, eye protection, and protective clothing.
  • Use in a well-ventilated area, fumes can occur during mixing.
  • Always add potassium hydroxide to water, not water to potassium hydroxide.
  • Avoid skin and eye contact, seek urgent help if exposure occurs.
  • Keep tightly sealed, store away from children, pets, sunlight, and heat.

Q: Is this the same as sodium hydroxide?
A: No, potassium hydroxide is typically used for liquid soap, sodium hydroxide is typically used for bar soap.

Q: Can I use this to adjust pH in a cosmetic cream?
A: It is generally too caustic for casual pH adjustment. Use only if you understand the formulation and safety requirements.

Q: Why does mixing lye produce fumes?
A: Dissolving strong alkalis in water releases heat and can create irritating vapours, ventilation is important.

View full details
Produced in South Africa
Natural Origin
Vegan
Cruelty-Free
R
Rian B. (Cape Town, ZA)

Great product. Awesome company to deal with. Fast and efficient. Highly recommended.

A
Adre M. (Cape Town, ZA)
Potassium hydroxide

Google showed so many suppliers who did not stock the item ( ever). The delivery was time sensitive and they were so professional
Product quality is excellent. Love dealing with this company.

M
Madelaine B. (Cape Town, ZA)
Excellent quality

After many purchases I have learnt that not all Potassium Hydroxide is the same quality. This one is excellent.

J
Josephine S. (Johannesburg, ZA)
Essentially Natural Caustic Potash (Potassium hydroxide)

The package is so professional and it was delivered very promptly. I am so satisfied with my purchase. Will definitely order again

M
Madelaine B. (Cape Town, ZA)

I recently bought Potassium Hydroxide from another supplier that turned my liquid soap into a milky mush. It is so refreshing to know that your products are reliable! Excellent product

J
Jean V.D.W. (Welkom, ZA)
Quality product

The product was easy to use and was packaged perfectly. it is a high-quality product and I will definitely be ordering this product in the future.
Thank you for the speedy service provided. I really appreciated the free sample sent in the package. It help to get to know the other products you company provides.

B
B. (Cape Town, ZA)
Potassium Hydroxide

Packaged really well, I really love the sample added with my package. Definitely earned a customer 🙏

K
Kerry B.
Castile Soap Ingredient

Came so promptly and packed with such care. Made some wonderful pure liquid Castile soap with olive oil which is fantastic.

A
Anje B. (Cape Town, ZA)
Potash

Great quality, order & delivery process was easy & fast.
Thank you!

D
Dale S. (Plumstead, ZA)
Dale

Good quality, fast delivery

L
Leonard D.P. (Orania, ZA)

i am very pleased. Very good and friendly service. I will definitely make more purchases from Essentially Natural.

D
Debra F. (Cape Town, ZA)
SATISFACTION

I could not find this product in my city in small quantity, & Essentially Natural met my need swiftly & I have made my liquid castile soap.

A
Anita M. (Alberton, ZA)
Essentially Natural Caustic Potash

This product is pure and excellentquality. I made a wonderful castile soap paste.

A
Azeem E. (Durban, ZA)

Essentially Natural Caustic Potash (Potassium hydroxide)

W
William W. (Durban, ZA)
Great service

Great service

D
David P. (Meyerton, ZA)
Happy

We’re satisfied with this product. Raw materials for alchemical transformation.

L
Lindisile F. (Durban, ZA)

Is this food grade potash?

Hi, no it is not

G
Garner H. (Cape Town, ZA)
Awesome service!

Fast service and even came with an awesome little free gift😁

F
Favour A. (Cape Town, ZA)
Perfect!

Delivery was quick and product is great!

Great to hear that, thanks Favour!

J
Johan G. (Cape Town, ZA)

Caustic Potash (Potassium hydroxide)

H
Henk S.

Regarding: Caustic Potash (Potassium Hydroxide) - Essentially Natural. I need to know the "KOH assay percentage". Please.

Essentially Natural

Hi Henk,

According to the Certificate of Analysis of some of our most recent Potassium Hydroxide batches, the KOH assay is 90.3%, against a specification of 90.0% minimum.

If you already have a pack, please send us the batch number printed on it and we can check the relevant COA for the exact assay. 😊

We hope that helps! Do reach out if you have any further queries.

Warm regards,
Aiden

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