Hemp Seed Oil
INCI Cannabis Sativa Seed Oil. Saponified with NaOH it is listed as Sodium Hempseedate, with KOH as Potassium Hempseedate. CAS 89958-21-4; EC 289-644-3, as CosIng gives them. Also: Cannabis sativa seed oil, Hempseed oil.
Calculate a 100 % Hemp Seed Oil bar
That is stoichiometry on a measured composition rather than a guess, and it is about as well determined as a published figure: checked against the 36 Codex oils where both fields come from the same standard, the method's median error is 0.84 % and its 90th percentile 2.44 %, and it runs slightly high, by 0.55 % on average. The formula page shows the working. If you have a certificate of analysis for your lot, enter its measured value in the calculator and this estimate is set aside.
Published values
| Saponification value | not published |
| Derived from composition | 192.2 ± 3 % mg KOH/g |
| Used by the calculator | 192.2 mg KOH/g (derived) |
| SAP for NaOH | 0.1370 g/g |
| Iodine value | 145–170 g I₂/100 g |
| INS (SAP − IV) | 35 |
| Melting point | — |
| Unsaponifiable matter | — |
Soapmaking books print about 0.135 g NaOH per g (median of 9 books), which agrees with ours to within 2 %.
A bar made of 100 % Hemp Seed Oil
Conventional qualities summed from the fatty-acid groups; a single-oil bar is a reference point, not a recipe.
How much lye
| Oil | NaOH | KOH |
|---|---|---|
| 500 g | 65.1 g | 91.3 g |
| 1 kg | 130.2 g | 182.6 g |
| 1 lb (454 g) | 59.0 g | 82.8 g |
| 2 lb (907 g) | 118.1 g | 165.6 g |
For this oil alone at 5 % superfat, with pure sodium hydroxide (NaOH) or pure potassium hydroxide (KOH); in brackets, across the published range of its saponification value. KOH is usually sold at 90 %: divide by 0.9. For a whole recipe, open the calculator.
Fatty-acid profile
Saturated : unsaturated 13 : 87
| Fatty acid | Published range, % | Used | |
|---|---|---|---|
| Palmitic acid | C16:0 · saturated | 4.5–12.5 | 8.5 |
| Palmitoleic acid | C16:1 | ≤ 1 | 1.0 |
| Stearic acid | C18:0 · saturated | 0.5–4.5 | 2.5 |
| Oleic acid | C18:1 | 5.5–20.5 | 13.0 |
| Linoleic acid | C18:2 | 44.5–65.5 | 55.0 |
| α-Linolenic acid | C18:3 n-3 | 13.5–30.5 | 22.0 |
| Arachidic acid | C20:0 · saturated | ≤ 2 | 2.0 |
| Gadoleic acid | C20:1 | ≤ 1 | 1.0 |
| Behenic acid | C22:0 · saturated | ≤ 1 | 1.0 |
Recipes that use it
- Facial bar 15 % of the oils
Guides that discuss it
Where these numbers come from
Values are the producer's release specification for cold-pressed hemp seed oil (Gustav Heess GmbH): iodine value 145.0-170.0 g I2/100 g (Ph. Eur. 2.5.4); acid value max 4.0; THC max 7.5 ppm; palmitic 4.5-12.5, palmitoleic max 1.0, stearic 0.5-4.5, oleic 5.5-20.5, linoleic 44.5-65.5, gamma-linolenic min 0.5, alpha-linolenic 13.5-30.5, arachidic max 2.0, eicosenoic max 1.0, behenic max 1.0 %. 'linolenic' here = alpha-linolenic (18:3 n-3); gamma-linolenic (min 0.5 %) is not one of the acids this database records. The saponification value is NULL: no saponification value printed on the sheet (refined-grade sheet Sp305030g likewise has none).
This record is part of the open ingredient database (ODbL), which you can download as CSV or JSON. Found an error or a better primary source? Corrections with a link to the document are welcome at support@soapformulator.com.