Hard Fat (Adeps solidus)
Also: Adeps solidus, Suppository base, Witepsol / Massa Estarinum type hard fat, Hydrogenated coconut/palm kernel glyceride base.
Published values
| Saponification value | 210–260 mg KOH/g |
| Used by the calculator | 235.0 mg KOH/g (midpoint) |
| SAP for NaOH | 0.1675 g/g |
| Iodine value | ≤ 3 g I₂/100 g |
| INS (SAP − IV) | 232 |
| Melting point | 30–45 °C |
| Unsaponifiable matter | ≤ 0.6 % |
A bar made of 100 % Hard Fat
The soap qualities are derived from the fatty-acid profile, which is below. They are shown here only for records the calculator can use.
How much lye
| Oil | NaOH | KOH |
|---|---|---|
| 500 g | 79.6 g(71.1–88.0) | 111.6 g(99.8–123.5) |
| 1 kg | 159.2 g(142.2–176.1) | 223.3 g(199.5–247.0) |
| 1 lb (454 g) | 72.2 g(64.5–79.9) | 101.3 g(90.5–112.0) |
| 2 lb (907 g) | 144.4 g(129.0–159.7) | 202.5 g(181.0–224.1) |
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
| Fatty acid | Published range, % | Used | |
|---|---|---|---|
| No fatty-acid profile could be sourced cleanly for this record yet. | |||
Where these numbers come from
Section 2 'Characteristic values' ends with rows 'Monographs: Ph.Eur. / USP / Jap. Pharm. Excipients' giving the monograph limits for hard fat.
Ph. Eur. 'Hard Fat' (Adeps solidus) monograph limits as reproduced in the Sasol WITEPSOL/MASSA ESTARINUM product information (row 'Monographs Ph.Eur.'): melting point 30-45 C, hydroxyl value max 50, acid value max 0.5, iodine value max 3.0, saponification value 210-260 mg KOH/g, unsaponifiable max 0.6 %. USP 'Hard Fat' row: melting range 27-44 C, hydroxyl max 70, acid max 1.0, iodine max 7.0, SAP 215-255, unsaponifiable max 3.0 %. JPE row: 30-45 C, hydroxyl max 70, acid max 2.0, iodine max 3.0, SAP 210-255, unsaponifiable max 3.0 %. Hard fat is a mixture of mono-, di- and triglycerides of saturated C10-C18 fatty acids obtained by esterification/hydrogenation of vegetable (coconut/palm kernel) fatty acids; no fatty-acid ranges are printed, so none given. Individual grades (e.g. Witepsol H 15: SAP 230-245, IV max 3, m.p. 33.5-35.5 C) are listed in the same document.
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.