In the HCO vs 12 HSA question, the short answer is this: hydrogenated castor oil (HCO) is the triglyceride, a wax-like fat, and 12-hydroxystearic acid (12-HSA) is the free fatty acid obtained by splitting it. Buy HCO when you want a wax, rheology additive or a fat to react yourself. Buy 12-HSA when you want to make a soap, ester or salt directly.
Both come from castor oil and both are made in Gujarat, so the choice is about your process, not about availability.
How are the two related?
Castor oil is mostly a triglyceride of ricinoleic acid. Hydrogenation saturates the double bond, which gives HCO, a hard, high-melting wax. Splitting HCO (hydrolysis) releases glycerol and the free acid, which is 12-HSA.
So HCO still contains glycerol bound in the molecule, while 12-HSA does not. That single difference decides most buying choices, because glycerol is an extra by-product if you need the acid.
Which one suits which job?
- Lithium and other metal soap greases: 12-HSA is the direct feed; HCO can be used but then you manage the glycerol released during saponification.
- Thixotropic additives for paints, coatings and inks: HCO is the usual choice, since it acts as a rheology modifier once processed into a suitable form.
- Waxes, polishes and candles: HCO, for its hardness and melting point.
- Esters, polyamides and other chemical intermediates: 12-HSA, because the free acid group reacts directly.
- Cosmetic and personal care formulations: either, depending on the INCI ingredient the formula names; confirm which one your formulator specified.
How do the specifications differ?
For HCO, buyers watch the melting point, hydroxyl value, iodine value, saponification value, acid value, colour and moisture. Our note on HCO melting point and hydroxyl value explains the first two.
For 12-HSA, the key figures are acid value, hydroxyl value, melting range and the content of other fatty acids, as covered in the 12-HSA acid value. Acid value is almost meaningless on HCO, which is mostly an ester, and saponification value is far more informative there.
Do not copy a specification across. A limit written for one product will pass or fail the other for the wrong reason.
What does it mean for cost and handling?
The acid takes an extra processing step, so the two are made and priced differently, and price movements follow castor oil. We do not quote prices here; a real quote comes from a sourcing review. Both are usually supplied as flakes or powder, and the choice of form is a separate decision to settle with your plant.
For the uses of each product, read what HCO is used for and what 12-HSA is used for.
If you are unsure, ask your formulator which ingredient name appears on the approved formula, then ask the supplier for a sample of that exact product. A trial in the real formulation settles the question faster than any comparison of numbers, and it shows whether the lot you later receive behaves like the sample. Also ask the supplier to confirm the grade name on every certificate, so HCO and 12-HSA are never mixed up in your stores.
Next step
Tell us your process and we will tell you which product your formula needs, find plants that make it to your limits and have a sample tested. Book a free sourcing review to start.