Hydroxypropyl Guar is a modified guar gum polysaccharide obtained by introducing hydroxypropyl groups onto the guar gum backbone. It is a naturally derived cosmetic ingredient used primarily for viscosity control, thickening, binding, film formation and emulsion stabilization in personal-care formulations.
Guar gum itself is a galactomannan obtained from the seeds of Cyamopsis tetragonoloba. Hydroxypropyl modification changes the hydration and formulation characteristics of the original polysaccharide and can provide improved performance in aqueous cosmetic systems.
Hydroxypropyl Guar is generally supplied as a white, off-white or pale yellow powder. When appropriately dispersed and hydrated, it can provide viscosity and contribute to the rheological characteristics of cosmetic formulations.
The performance of Hydroxypropyl Guar varies according to molecular-weight characteristics, hydroxypropyl substitution, particle size, concentration and processing conditions. Commercial grades are therefore selected according to the required viscosity and application.
Hydroxypropyl Guar is chemically described as Guar gum, 2-hydroxypropyl ether, depolymerized. The commonly reported CAS identifiers are 39421-75-5 and 68442-94-4, with 39421-75-5 commonly used for Hydroxypropyl Guar in cosmetic and technical documentation.
The polymer retains the galactomannan structure of guar gum, consisting primarily of a mannose backbone with galactose side groups, while some available hydroxyl groups are modified through hydroxypropyl etherification. The exact substitution and molecular-weight distribution depend on the manufacturing process and commercial grade.
Because Hydroxypropyl Guar is a modified natural polymer, it does not have one universally applicable small-molecule molecular formula or fixed molecular weight. It should also be distinguished from Hydroxypropyl Guar Hydroxypropyltrimonium Chloride, which is a separately modified, cationic guar derivative.
Hydroxypropyl Guar is recognized for viscosity-controlling, binding, film-forming, emulsion-stabilizing and antistatic functions.
As a polymeric thickener, it can increase the viscosity of aqueous cosmetic systems and help provide a desirable consistency. It can also contribute to film formation on skin or hair and support the physical stability of suitable formulations.
Hydroxypropyl modification can improve the handling and hydration characteristics of guar-derived polymers. Depending on the grade, the ingredient can provide useful performance in formulations where a plant-derived polysaccharide is preferred.
In hair-care products, Hydroxypropyl Guar can be considered for conditioning and formulation-structuring applications. In skin-care products, it can contribute to texture, viscosity and film-forming characteristics.
Hydroxypropyl Guar can be evaluated in a variety of skin-care, hair-care and personal-care formulations.
Potential applications include shampoos, conditioners, hair masks, cleansing products, gels, lotions, creams, serums and other aqueous or semi-solid cosmetic formulations.
In hair-care systems, suitable grades can provide conditioning-related formulation benefits and contribute to product viscosity. In skin-care formulations, Hydroxypropyl Guar can help modify texture and consistency while providing polymeric film-forming functionality.
It can be combined with Xanthan Gum, Hydroxyethylcellulose, Hydroxypropylcellulose, Hydroxypropyl Methylcellulose, Sodium Carboxymethylcellulose and other hydrocolloids when a specific rheological profile is required.
Hydroxypropyl Guar should be dispersed carefully to achieve uniform hydration and avoid agglomeration. The grade, particle size, concentration, mixing conditions and hydration time can influence the resulting viscosity.
Commercial Hydroxypropyl Guar grades can differ considerably in viscosity. For example, one documented high-molecular-weight grade specifies a 1% solution viscosity of 2500–4500 mPa·s, while another commercial grade specifies 3500–5000 mPa·s under its particular test conditions. These values are grade-specific and should not be treated as universal specifications.
The Assay (HPLC) field should not be populated with an arbitrary percentage. Hydroxypropyl Guar is a heterogeneous modified polysaccharide, so quality characterization is better based on applicable parameters such as viscosity, moisture, pH, substitution level, ash, particle size and microbiological quality.
Formulators should also evaluate compatibility with electrolytes, surfactants, acids, bases and other polymers because these components can affect hydration, viscosity and formulation stability.
Hydroxypropyl Guar is a specialty cosmetic ingredient for manufacturers seeking a modified guar-based polymer with viscosity-controlling, binding, film-forming and stabilization characteristics.
For B2B sourcing, important quality parameters include the exact CAS identity, hydroxypropyl substitution, viscosity grade, moisture, pH, particle size, ash and microbiological characteristics.
As a Hydroxypropyl Guar Cosmetic Ingredient Manufacturer in India, the ingredient can support bulk cosmetic raw-material requirements for skin-care, hair-care, cleansing and personal-care manufacturers.
| Parameter | Specification |
|---|---|
| Appearance | White or colourless crystals / white powder |
| Loss on Drying | NMT 10% |
| Residue on Ignition | NMT 1.6% |
| pH (1% Solution) | 4.0 – 7.0 |