HYDROXYPROPYL GUAR- ▸ Personal care: thickener and conditioning polymer
- ▸ Oil & gas: crosslinkable gellant for fracturing fluids
- ▸ Rheology control: water-thickening modified polysaccharide
- ▸ Typical Certificate of Analysis (CoA) PDF · COA
Values shown are typical for the current commercial grade. A lot-specific Certificate of Analysis accompanies every shipment; the grade-specific SDS is available on request.
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 →Hydroxypropyl guar (HPG; INCI Hydroxypropyl Guar; CAS 39421-75-5) is a nonionic, water-soluble polymer — guar gum modified with propylene oxide. The hydroxypropyl groups give it better clarity, cold-water solubility and salt/pH tolerance than native guar, so it works as a thickener, rheology modifier, film former and conditioning polymer across personal care, oilfield and industrial systems.
What is hydroxypropyl guar?
HPG is the hydroxypropyl ether of guar galactomannan. Etherifying guar reduces its insolubles and improves clarity, hydration in cold water, and tolerance to salts and pH swings, while keeping guar’s strong water-thickening power. It is nonionic, so it is compatible with a wide range of surfactants and additives.
Applications by sector
Personal care. A thickener, rheology modifier and conditioning/film-forming polymer in shampoos, conditioners, cleansers, gels and creams, adding slip and a smooth feel. Oil & gas. A gelling and viscosifying polymer for hydraulic-fracturing fluids and drilling/workover fluids, where it is crosslinked to carry proppant. Industrial & other. A thickener and water-control additive in textiles, explosives slurries, mining and construction. Hydrate fully and match the grade to the viscosity and clarity you need.
Forms and grades
Supplied as a powder in a range of viscosity grades and degrees of substitution; specify viscosity grade and mesh on the RFQ. The CoA documents the lot.
Handling and documentation
HPG is a stable powder; manage dust and avoid lumping on hydration per the Safety Data Sheet (SDS) and good practice. Each lot ships with a Certificate of Analysis (CoA).
Bulk supply and RFQ
RawSource supplies hydroxypropyl guar in bulk to personal-care, oilfield and industrial buyers, with CoA and SDS per lot. Submit an RFQ with your viscosity grade and target quantity.
Typical Properties
Typical reference values, not a specification; the Certificate of Analysis (CoA) for the lot governs.
| Property | Typical Value |
|---|---|
| INCI Name | Hydroxypropyl Guar |
| CAS Number | 39421-75-5 |
| Chemical type | Nonionic guar galactomannan ether (hydroxypropyl-modified) |
| Appearance | Off-white powder |
| Solubility | Water-soluble (improved cold-water hydration vs native guar) |
| Function | Thickener, rheology modifier, film former, conditioning polymer |
| Grades | Range of viscosity grades / degrees of substitution |
Regulatory & registration requirements
- TSCA (US):
- REACH (EU): Not determined from public registry
- EC number: 609-675-1
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
Solutions Using This Product
Process-solution guides on this site that specify this chemistry:
- Pipeline Cleaning, Gel-Pig & Commissioning Chemicals (Oil, Gas & Mining)
- Hydraulic Fracturing Chemicals (Friction Reducers & Gels) (Oil, Gas & Mining)
Frequently Asked Questions
What is hydroxypropyl guar used for?
Hydroxypropyl guar (HPG, CAS 39421-75-5) is a water-soluble thickener and rheology modifier used as a conditioning and film-forming polymer in personal care, a crosslinkable gelling polymer in oilfield fracturing and drilling fluids, and a thickener in textiles, mining and construction.
How is hydroxypropyl guar different from guar gum?
HPG is guar modified with propylene oxide, which improves clarity, cold-water solubility and tolerance to salt and pH while keeping guar’s thickening power — so it performs better in clear and demanding formulations than native guar.
Why is HPG used in fracturing fluids?
It hydrates to a viscous gel that can be crosslinked to carry proppant into the fracture, then broken to recover permeability — the basis of guar-based hydraulic-fracturing fluids.
What is the CAS of hydroxypropyl guar?
It is CAS 39421-75-5. As a modified natural polymer it is supplied in viscosity grades; the CoA documents each lot.
How is bulk hydroxypropyl guar supplied and quoted?
RawSource supplies it as a powder in bulk with CoA and SDS per lot. Pricing is quote-based on viscosity grade and volume; submit an RFQ with your target quantity.
What is the REACH and TSCA regulatory status of Hydroxypropyl Guar (HPG)?
Hydroxypropyl Guar (HPG) (CAS 39421-75-5) is listed as Active on the U.S. EPA TSCA Inventory; its REACH registration status is not determined from the public ECHA registry.