Peanut (groundnut) oil: SAP value and fatty acids
Peanut (groundnut) oil has a saponification value of 191.5 mg KOH/g. One gram needs 0.137 g of sodium hydroxide (NaOH) for bar soap or 0.192 g of potassium hydroxide (KOH) for liquid soap to turn fully into soap, before any superfat.
Key numbers
- SAP, NaOH
- 0.136517 g per g oil
- SAP, KOH
- 0.1915 g per g oil
- Saponification value
- 191.5 mg KOH/g
- Iodine value
- 96.5
- INS
- 95
- INCI name
- Arachis Hypogaea Oil
Example: 100 g of Peanut (groundnut) oil with no superfat needs 13.7 g of 100% NaOH, or 19.2 g of 100% KOH. A 5% superfat uses 5% less.
In soap
Its main fatty acids in our cited profile are oleic (52%) and linoleic (27.5%). The eight fatty acids used in soap-quality scores make up 93.7% of the profile.
On its own it scores 14 for hardness, 0 for cleansing and 80 for conditioning, with a saturated : unsaturated split of 14 : 80.
Common, well-documented oil. Allergen: label it.
Fatty-acid profile
| Fatty acid | % of fatty acids | Counts toward |
|---|---|---|
| lauric | 0.1% | hardness, cleansing, bubbly lather |
| myristic | 0.1% | hardness, cleansing, bubbly lather |
| palmitic | 11% | hardness, creamy lather |
| stearic | 2.8% | hardness, creamy lather |
| ricinoleic | 0% | conditioning, bubbly and creamy lather |
| oleic | 52% | conditioning |
| linoleic | 27.5% | conditioning |
| linolenic | 0.2% | conditioning |
Basis: Codex CXS 210 Table 1 (arachis oil) midpoints; Codex range midpoints; 'ND' = 0, 'ND–x' or '<x' = x/2.
Soap-quality scores (this oil alone)
| Hardness | 14 |
|---|---|
| Cleansing | 0 |
| Conditioning | 80 |
| Bubbly lather | 0 |
| Creamy lather | 14 |
| Iodine | 97 |
| INS | 95 |
Each score adds up certain fatty acids, the way Soap Ledger scores a whole recipe. They are for comparing recipes; they don't predict how a bar will feel, and they say nothing about safety or skin.
Sources
SAP value: 191.5 mg KOH/g (Codex CXS 210 range midpoint), from Codex Alimentarius CXS 210-1999, Standard for Named Vegetable Oils (Table 2: chemical and physical characteristics), FAO/WHO Codex Alimentarius Commission. Printed value: 187-196 mg KOH/g.
Published values we checked:
- 187-196 mg KOH/g — FAO/WHO Codex Alimentarius Commission
- 188 – 196 mg KOH/g — Ministry of Health, Labour and Welfare (Japan)
- 188～195 mg KOH/g — Ministry of Health, Labour and Welfare (Japan)
- 188 to 196 mg KOH/g — Food Safety and Standards Authority of India (FSSAI)
- 190 mg KOH/g — From Nature With Love (soap/cosmetic supplier)
- NaOH 0.1367 / KOH 0.1925 g alkali per g oil — Certified Lye
Fatty acids and iodine: Codex Alimentarius CXS 210-1999, Standard for Named Vegetable Oils (Table 2: chemical and physical characteristics), FAO/WHO Codex Alimentarius Commission. Also checked: USDA Agricultural Research Service (SR Legacy release 2018-04 (bulk CSV food_nutrient.csv); fatty acids in g/100 g food).
NaOH and KOH values are converted from mg KOH/g with the molar masses 39.997 and 56.106 and rounded to 6 decimals, exactly as in the Soap Ledger app. Real oils vary by origin, grade and lot: check your supplier's certificate of analysis. Verify every weight before you make this, and follow lye safety. Not a safety or compliance certification.
Last updated .