Goose fat: SAP value and fatty acids
Goose fat has a saponification value of 192.1 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
- 0.136945 g per g oil
- SAP, KOH
- 0.1921 g per g oil
- Saponification value
- 192.1 mg KOH/g
- Iodine value
- 82.5
- INS
- 110
- INCI name
- No Cosing Entry Found For Goose Fat
Example: 100 g of Goose fat 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 (56.1%) and palmitic (21.7%). The eight fatty acids used in soap-quality scores make up 95.5% of the profile.
On its own it scores 29 for hardness, 1 for cleansing and 67 for conditioning, with a saturated : unsaturated split of 29 : 67.
Published sources for this oil differ by more than 3%, so checking your supplier's certificate of analysis matters more than usual.
Fatty-acid profile
| Fatty acid | % of fatty acids | Counts toward |
|---|---|---|
| lauric | 0% | hardness, cleansing, bubbly lather |
| myristic | 0.5% | hardness, cleansing, bubbly lather |
| palmitic | 21.7% | hardness, creamy lather |
| stearic | 6.4% | hardness, creamy lather |
| ricinoleic | 0% | conditioning, bubbly and creamy lather |
| oleic | 56.1% | conditioning |
| linoleic | 10.3% | conditioning |
| linolenic | 0.5% | conditioning |
Basis: USDA FDC SR Legacy 173572, converted to % of total fatty acids.
Soap-quality scores (this oil alone)
| Hardness | 29 |
|---|---|
| Cleansing | 1 |
| Conditioning | 67 |
| Bubbly lather | 1 |
| Creamy lather | 28 |
| Iodine | 83 |
| INS | 110 |
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: 192.1 mg KOH/g (Median of sources), from Pop F., Dippong T. (2024) The Antioxidant Effect of Burdock Extract on the Oxidative Stability of Lard and Goose Fat during Heat Treatment. Foods 13(2):304, MDPI (open access, peer-reviewed). Printed value: 195 ± 0.4 (non-additivated, unheated) mg KOH/g.
Published values we checked:
- 195 ± 0.4 (non-additivated, unheated) mg KOH/g — MDPI (open access, peer-reviewed)
- NaOH 0.1349 / KOH 0.1900 g alkali per g oil — Certified Lye
Fatty acids and iodine: USDA FoodData Central, SR Legacy: Fat, goose (FDC ID 173572), U.S. Department of Agriculture, Agricultural Research Service. Also checked: MDPI (open access, peer-reviewed) (Table 1); Nature Portfolio (Table 4).
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 .