{"id":28497,"date":"2025-02-10T13:55:11","date_gmt":"2025-02-10T13:55:11","guid":{"rendered":"https:\/\/sabunyapimi.com\/en\/?p=28497"},"modified":"2026-09-25T09:20:17","modified_gmt":"2026-09-25T09:20:17","slug":"oils-used-in-soap-making","status":"publish","type":"post","link":"https:\/\/sabunyapimi.com\/en\/oils-used-in-soap-making\/","title":{"rendered":"Oils Used in Soap Making: Properties, Benefits and How to Choose"},"content":{"rendered":"

Oils are the foundation of a soap recipe. They influence how firm a bar becomes, how it lathers, how it feels during washing and how much lye is needed to make it. Olive oil, coconut oil and castor oil may all look like simple ingredients on a label, but they behave differently in soap.<\/p>\n

This guide explains the most common oils used in soap making, what each one contributes and how to combine them. It also covers fatty acids, SAP values and the questions to ask before replacing an oil in a recipe.<\/p>\n

Why Do Oils Matter in Soap Making?<\/h2>\n

In soap making, oils and fats react with an alkali through a process called saponification<\/strong>. Sodium hydroxide (NaOH) is commonly used for firm bar soap, while potassium hydroxide (KOH) is commonly used for liquid soap.<\/p>\n

Each oil contains a different mixture of fatty acids. Those fatty acids help determine the characteristics of the resulting soap. An oil rich in lauric acid behaves differently from one rich in oleic acid, even if both oils are used at the same weight.<\/p>\n

This is why soap makers often blend oils. One ingredient can contribute bubbly lather, another can support a firm bar, and another can change the character of the lather or the way the bar feels in use. The result depends on the whole formula<\/strong>, not on a single oil.<\/p>\n

Common Oils Used in Soap Making<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Oil or butter<\/th>\nMain contribution to bar soap<\/th>\nApproximate NaOH SAP value<\/th>\n<\/tr>\n<\/thead>\n
Olive oil<\/td>\nMild-feeling soap with modest, creamy lather<\/td>\n0.135<\/td>\n<\/tr>\n
Coconut oil (76\u00b0)<\/td>\nHardness, strong cleansing and large bubbles<\/td>\n0.183<\/td>\n<\/tr>\n
Palm oil<\/td>\nFirmness and stable, creamy lather<\/td>\n0.142<\/td>\n<\/tr>\n
Palm kernel oil<\/td>\nFirmness, cleansing and bubbly lather<\/td>\n0.176<\/td>\n<\/tr>\n
Castor oil<\/td>\nSupport for lather and foam stability<\/td>\n0.128<\/td>\n<\/tr>\n
Shea butter<\/td>\nFirmness and a creamy character<\/td>\n0.128<\/td>\n<\/tr>\n
Cocoa butter<\/td>\nHardness and dense, creamy lather<\/td>\n0.138<\/td>\n<\/tr>\n
Sweet almond oil<\/td>\nOleic-rich addition for a mild-feeling bar<\/td>\n0.139<\/td>\n<\/tr>\n
Avocado oil<\/td>\nOleic-rich addition to a blended formula<\/td>\n0.133<\/td>\n<\/tr>\n
Rice bran oil, refined<\/td>\nVersatile addition to a blended formula<\/td>\n0.133<\/td>\n<\/tr>\n
Sunflower oil<\/td>\nSoftness; characteristics depend on the variety<\/td>\n0.135<\/td>\n<\/tr>\n<\/tbody>\n<\/table>
SAP figures are approximate grams of pure NaOH required per gram of oil at 0% superfat. They are reference values, not a finished recipe.<\/figcaption><\/figure>\n

Olive Oil: A Classic Soap Making Oil<\/h2>\n

Olive oil is rich in oleic acid. In soap, it is associated with a mild feel and a smaller, creamier lather than the large bubbles produced by coconut oil. It can form a substantial part of a blended recipe or be used on its own to make a traditional olive-oil bar commonly called Castile soap.<\/p>\n

A high-olive recipe can take longer to become firm enough to unmold and may benefit from a longer cure. That does not make it an inferior soap; it simply behaves differently from a recipe containing more coconut oil or other hard fats.<\/p>\n

Useful when:<\/strong> You want an oleic-rich base and are comfortable allowing adequate time for the bar to harden and cure.<\/p>\n

Coconut Oil: Hard Bars and Bubbly Lather<\/h2>\n

Coconut oil is a popular soap making ingredient because it contributes hardness, strong cleansing and abundant bubbles. Its fatty acid profile is particularly rich in lauric and myristic acids.<\/p>\n

Those qualities make coconut oil valuable in a blend, but more is not always better. A recipe with a high proportion of coconut oil may feel too strongly cleansing for its intended use. Evaluate its percentage alongside the other oils and the chosen superfat.<\/p>\n

Check the variety:<\/strong> Ordinary coconut oil and fractionated coconut oil are different ingredients with different SAP values. Select the correct entry in your lye calculator.<\/p>\n

Palm Oil and Palm Kernel Oil: Two Different Ingredients<\/h2>\n

Despite their similar names, palm oil<\/strong> and palm kernel oil<\/strong> do different jobs in soap and require different amounts of lye.<\/p>\n

Palm oil contributes palmitic acid, which helps create a firm bar and stable, creamy lather. Palm kernel oil has more in common with coconut oil in its soap making behavior: it contributes bubbly lather and stronger cleansing.<\/p>\n

They should never be treated as interchangeable entries in a formula. If you choose to replace either one, recalculate the recipe with the exact replacement oil.<\/p>\n

Castor Oil: A Small Addition with a Distinct Role<\/h2>\n

Castor oil stands out because of its high ricinoleic acid content. Soap makers often include it in a modest amount to support the lather produced by the rest of the formula.<\/p>\n

Castor oil is generally more useful as part of a balanced blend than as the main oil in a bar. Its role is to complement ingredients such as olive and coconut oil rather than replace them.<\/p>\n

Useful when:<\/strong> You want to adjust a recipe\u2019s lather without making castor oil the dominant ingredient.<\/p>\n

Shea Butter and Cocoa Butter<\/h2>\n

Butters can help shape the firmness and texture of a soap bar, but they do not behave identically.<\/p>\n

Shea butter<\/strong> contains fatty acids that can support a firmer bar and a creamy character. Cocoa butter<\/strong> is valued for its contribution to hardness and dense, creamy lather. Either may be used as part of a wider oil blend.<\/p>\n

It is tempting to assume that adding an expensive butter will automatically make a finished soap \u201cmoisturizing.\u201d Soap is a rinse-off product, and much of an oil reacts during saponification. Evaluate a butter by its effect on the finished formula<\/em>, rather than assuming that the original oil\u2019s properties carry over unchanged.<\/p>\n

Avocado, Sweet Almond and Rice Bran Oils<\/h2>\n

These oils can add variety to a recipe built around more familiar ingredients. Avocado and sweet almond oils are commonly chosen for their oleic-rich profiles. Refined rice bran oil is another versatile option for blended bar soaps.<\/p>\n

They may appear similar when planning a formula, but their SAP values are not identical. Cost, availability and the desired fatty acid balance can all influence your choice. When testing a substitute, make one deliberate change at a time and record the result.<\/p>\n

Sunflower Oil: Check the Fatty Acid Profile<\/h2>\n

\u201cSunflower oil\u201d does not always describe the same fatty acid profile. Standard and high-oleic sunflower oil<\/strong> can have different proportions of oleic and linoleic acids. That distinction matters when considering the balance and storage stability of a soap recipe.<\/p>\n

Oils higher in polyunsaturated fatty acids can be more susceptible to oxidation. Use fresh oil, store it appropriately and consider the entire formula rather than judging shelf life by one ingredient alone. Read the supplier\u2019s specification when the variety matters to your recipe.<\/p>\n

What Do Fatty Acids Tell You About an Oil?<\/h2>\n

An oil\u2019s fatty acid profile is often more informative than whether it is liquid or solid at room temperature. The main fatty acids shown in soap making charts include:<\/p>\n