Peach kernel oil: SAP value and fatty acids
Peach kernel oil has a saponification value of 191 mg KOH/g. One gram needs 0.136 g of sodium hydroxide (NaOH) for bar soap or 0.191 g of potassium hydroxide (KOH) for liquid soap to turn fully into soap, before any superfat.
Key numbers
- SAP, NaOH
- 0.136161 g per g oil
- SAP, KOH
- 0.191 g per g oil
- Saponification value
- 191 mg KOH/g
- INCI name
- Prunus Persica Kernel Oil
Example: 100 g of Peach kernel oil with no superfat needs 13.6 g of 100% NaOH, or 19.1 g of 100% KOH. A 5% superfat uses 5% less.
In soap
Its main fatty acids in our cited profile are oleic (65.1%) and linoleic (19.1%). The eight fatty acids used in soap-quality scores make up 96.3% of the profile.
On its own it scores 12 for hardness, 0 for cleansing and 85 for conditioning, with a saturated : unsaturated split of 12 : 85.
Similar to sweet almond and apricot kernel oils. Only supplier figures, but they agree.
Fatty-acid profile
| Fatty acid | % of fatty acids | Counts toward |
|---|---|---|
| lauric | 0% | hardness, cleansing, bubbly lather |
| myristic | 0% | hardness, cleansing, bubbly lather |
| palmitic | 8.1% | hardness, creamy lather |
| stearic | 3.5% | hardness, creamy lather |
| ricinoleic | 0% | conditioning, bubbly and creamy lather |
| oleic | 65.1% | conditioning |
| linoleic | 19.1% | conditioning |
| linolenic | 0.5% | conditioning |
Basis: Fratianni et al. 2021 Table 1, commercial cold-pressed peach seed oil, mean of 3.
Soap-quality scores (this oil alone)
| Hardness | 12 |
|---|---|
| Cleansing | 0 |
| Conditioning | 85 |
| Bubbly lather | 0 |
| Creamy lather | 12 |
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 mg KOH/g (Median of sources' mgKoh_mid), from Saponification Chart, From Nature With Love (soap/cosmetic supplier). Printed value: 185 - 195 mg KOH/g.
Published values we checked:
- 185 - 195 mg KOH/g — From Nature With Love (soap/cosmetic supplier)
- NaOH 0.1361 / KOH 0.1917 g alkali per g oil — Certified Lye
- 191 mg KOH/g — The Soapery (UK soap supplier)
Fatty acids: Fatty Acid Composition, Antioxidant, and in vitro Anti-inflammatory Activity of Five Cold-Pressed Prunus Seed Oils (Fratianni et al., Front Nutr 2021; DOI 10.3389/fnut.2021.775751), Frontiers (peer-reviewed, open access). Also checked: MDPI (peer-reviewed, open access) (Table 3, 'Peach Oil (%)' column).
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.
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