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Moumoujus

POTASSIUM SULFATE.

Valuable CAS 7778-80-5 / VISCOSITY CONTROLLING

Potassium sulfate is an inorganic salt primarily recognized in skincare for its essential role in product formulation. It acts as a versatile agent, enhancing product texture and stability while supporting the even distribution of active compounds.

Summary

viscosity controlling thickening agent emulsion stabilizing buffering agent

Science

Mechanism of Action

Within cosmetic formulations, potassium sulfate primarily functions as a viscosity controller, allowing for precise adjustment of product texture, from thin serums to rich creams. It also acts as an emulsion stabilizer, ensuring a homogenous blend of oil and water phases, thereby promoting consistent delivery of ingredients. Furthermore, it can serve as a buffering agent, helping to maintain a product's optimal pH balance. Historically, a 5% solution was noted for topical mosquito repellent properties, with some theories suggesting it may temporarily open skin pores.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

No data indicates that potassium sulfate commonly 'dusts' or leaves undesirable residue on the skin when formulated appropriately, given its water solubility and primary role as a formulation aid.

The Formula

Formulation

Solubility
Water
Optimal pH 3.5 – 7
0 7 14

Stability

This ingredient exhibits stability within a pH range of 3.5 to 7.0 and is stable when exposed to air. To maintain its integrity, it should be stored in a dry, cool environment, protected from direct sunlight, excessive heat above 80°C, and moisture.

Conflicts

  • strong alkali
  • metals (e.g., aluminum)
  • chlorine trifluoride

Safety

Safety Profile

CIR Status
Safe as used
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel has affirmed potassium sulfate as safe for cosmetic use, consistent with its inclusion in broader safety assessments for inorganic sulfates. Although a specific maximum concentration for potassium sulfate itself wasn't detailed in a 2013 industry survey, related sulfates have been reported at concentrations up to 49% in bath products and 37% in lipsticks. It is FDA-approved as a direct food additive and is registered with the FDA's Voluntary Cosmetic Registration Program (VCRP) for various cosmetic applications. Concerns regarding cancer, allergies, immunotoxicity, and developmental/reproductive toxicity are considered low.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Verdict

Valuable

Potassium sulfate is a valuable ingredient, primarily serving as a formulation enhancer to optimize product texture, stability, and pH, ensuring effective delivery of other active ingredients.

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References

Sources