Product Name: SolaStay® S1


CAS: 947753-66-4 Patent: U.S. Patents 7,588,702; 7,597,825; 7,713,519; 7,754,191; more below

SolaStay S1 is a viscous yellow liquid designed for use in skin care and sun care products. It is a highly efficient singlet state quencher for Butyl Methoxydibenzoylmethane (Avobenzone) and Ethylhexyl Methoxycinnamate (Octinoxate). Indeed, it outperforms Octocrylene as an Avobenzone photostabilizer, photostabilizes Octinoxate and Avobenzone when formulated together, is an outstanding solvent for crystalline UV filters, is easily emulsified, and is suitable for use in lotion, cream, spray, stick, and gel formulations. At a recommended use level in sunscreens equal to the weight percentage of Avobenzone in the formulation, the result is new heights in broad spectrum UVA and UVB photoprotection.
SolaStay S1 has also been documented to substantially photostabilize Cholecalciferol, Resveratrol, Retinol, Retinyl Palmitate, and Ubiquinone, which may be incorporated in skin care products for their anti-aging and other benefits. The recommended used level for SolaStay S1 in such products is between 3 and 5%.
Additional U.S. Patent numbers: 7,959,834; 8,070,989; 8,075,808; 8,133,477; 8,257,687; 8,263,050; 8,263,051; 8,268,294; 8,278,332; 8,329,148; 8,431,112. Patents Pending.

Typical Properties:
Appearance (25°C)   Clear yellowish viscous liquid
Color (Gardner)   9
Odor   Mild characteristic
Dielectric Constant (25°C)   12.9
Specific Gravity (25°C/25°C)   1.075
Viscosity (cP, 25°C)   13000
Viscosity (cP, 80°C)   58
Acid Value (mg KOH/g)   0.7

Toxicology Profile:
Repeat Insult Patch Test (Human) Did not indicate a potential for dermal irritation or allergic contact sensitization.
Ocular / Eye Irritation Practically no ocular irritation potential in vivo at 20% (HET-CAM).
Phototoxicity Did not induce a response indicative of a photoxic reaction.
Ames Test No detectable genotoxic activity in absence or presence of S9 enzyme activation.

Features & Benefits:
Anti-aging Ingredient Photostabilizer, Sunscreen Active Photostabilizer, and Sunscreen Solvent

Suggested Uses:
After Sun Skin Care, Beach Wear Sun Care, Daily Wear Sun Care, Facial Color Cosmetics, and Facial Skin Care

Solvency of:
  • 4-Methylbenzylidene Camphor (Enzacamene) 49%
  • Benzophenone-3 (Oxybenzone) 30%
  • Bis-Ethylhexyloxyphenol Methoxyphenol Triazine (Bemotrizinol) 25%
  • Butyl Methoxydibenzoylmethane (Avobenzone) 32%
  • Diethylamino Hydroxybenzoyl Hexyl Benzoate 74%
  • Ethylhexyl Triazone 25%

Soluble in:
  • Alcohol [Ethanol]
  • Cosmetic Esters

Container Weight
Drum 420 lbs
Pail 40 lbs

The technical information and suggestions for use contained herein are believed to be reliable, but they are not to be construed as warranties and no patent liability can be assured.