What is PEG-25 Hydrogenated Castor Oil and how does it compare to PEG-40?
PEG-25 Hydrogenated Castor Oil (CAS 61788-85-0) is a nonionic surfactant made by ethoxylating hydrogenated castor oil with an average of 25 ethylene oxide units. It works as an emulsifier and co-emulsifier at a lower HLB than the higher-EO PEG-40 Hydrogenated Castor Oil, which is the more water-soluble fragrance and oil solubilizer. The grade ladder below compares both grades by EO number.
PEG-80 HYDROGENATED CASTOR OIL- ▸ Solubilization: solubilizer for fragrances, oils and lipophilic actives
- ▸ Emulsification: oil-in-water emulsifier in personal-care formulations
- ▸ Surfactant: nonionic surface-active agent
| Grade | Avg. EO units | CAS No. | Mol. formula | Mol. wt (g/mol) |
|---|---|---|---|---|
| PEG-25 Hydrogenated Castor Oil you are here | 25 | 61788-85-0 | — | — |
| PEG-40 Hydrogenated Castor Oil | 40 | 61788-85-0 | C63H122O15 | 1119.6 |
How to choose: Both grades are nonionic surfactants made by ethoxylating hydrogenated castor oil and differ only in average EO. More EO raises HLB and water-solubilizing power: PEG-40 Hydrogenated Castor Oil (higher EO) is the higher-HLB solubilizer for fragrances, essential oils and lipophilic actives at low dose, while PEG-25 Hydrogenated Castor Oil (lower EO) is a lower-HLB emulsifier and co-emulsifier.
HLB system: how to choose an emulsifier · Browse all products
A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
Request SDS →PEG-25 hydrogenated castor oil (CAS 61788-85-0) is a nonionic surfactant produced by ethoxylating hydrogenated castor oil with about 25 moles of ethylene oxide. It is used as an emulsifier, solubilizer and surfactant in cosmetic and personal-care formulations.
Regulatory & registration requirements
- TSCA (US):
- REACH (EU):
- EC number: 500-147-5
TSCA Inventory flag XU: a substance exempt from reporting under the Chemical Data Reporting Rule (40 CFR 711) (EPA flag legend).
Source: EPA TSCA Inventory (July 2025 release) · ECHA CHEM — retrieved 2026-07-12
Frequently Asked Questions
Is PEG-25 hydrogenated castor oil the same as castor oil?
No. PEG-25 hydrogenated castor oil (CAS 61788-85-0) is made by hydrogenating castor oil and then ethoxylating it with about 25 moles of ethylene oxide, producing a nonionic surfactant. The PEG and hydrogenation steps make it function as an emulsifier and solubilizer rather than as a simple plant oil.
What is another name for hydrogenated castor oil?
Hydrogenated castor oil is also known as castor wax. The PEG-25 ethoxylated derivative is named PEG-25 hydrogenated castor oil (also written as PEG-25 castor oil derivative); CAS 61788-85-0.
What is PEG-25 hydrogenated castor oil used for?
It is used as a solubilizer for fragrances, oils and lipophilic actives, as an oil-in-water emulsifier in personal-care formulations, and as a general nonionic surface-active agent.
How is bulk PEG-25 hydrogenated castor oil packaged?
RawSource supplies it in bulk industrial packaging such as drums and totes (CAS 61788-85-0, HS 3402.42). CoA and SDS are provided per lot; contact RawSource with your volume and destination for available pack sizes.
What is the cost of bulk PEG-25 hydrogenated castor oil?
Bulk pricing varies with volume, packaging and destination. Request a quote from RawSource with your target quantity and ship-to location for current landed pricing.
What is the REACH and TSCA regulatory status of PEG-25 Hydrogenated Castor Oil?
PEG-25 Hydrogenated Castor Oil (CAS 61788-85-0) is subject to U.S. TSCA Inventory requirements; supplying it into the EU requires valid REACH registration ((EC) No 1907/2006). RawSource cannot verify a third-party supplier's registrations — buyers should require documented TSCA and REACH compliance for their jurisdiction and volume (EC 500-147-5).