Print Friendly Version of this pagePrint Get a PDF version of this webpagePDF

SolaStay® P1

INCI Name: Polyester-25
Product Code: 1031
CAS #: 1361958-36-2
Patents: 7,799,317; 7,981,402
Brand: SolaStay®

SolaStay® P1 (Polyester-25), a bis-methoxycrylene/octyldodecyl adipic acid/methylpropanediol copolymer, is a highly effective singlet state quencher, permitting formulators to combine active ingredients once considered too photo-unstable to be effective. SolaStay® P1 is a copolymer that photostabilizes Avobenzone extremely well. As with SolaStay® S1, it protects against lost of absorbance much faster than Octocrylene, and is suitable for beach and daily wear products in spray, lotion, cream, balm and gel forms. As a polymer, it may enhance the water resistance of products in which it is incorporated. It is most effective in combination with other photostabilizers. Typical use level: 1 – 5%.

Features & Benefits:

  • Substantivity Aid
  • Sunscreen Active Photostabilizer
  • Water Resistance Enhancement
Appearance (25°C) Clear to slightly opalescent viscous light brown liquid
Color (Gardner) 8+
Odor Mild, characteristic
Viscosity (cP, 25°C) 25000
Viscosity (cP, 80°C) 300
Dielectric Constant (25°C) 9.01
Refractive Index (25°C) 1.509
Specific Gravity (25°C/25°C) 1.13
Acid Value (mg KOH/g) 1
Flash Point (°C) >204
Insoluble In
  • Alcohol
  • Water
Soluble In
  • Cosmetic Esters
  • Ethylhexyl Methoxycinnamate
Toxicology Profile
  • Ocular / Eye Irritation: May cause slight irritation of susceptible persons.
  • Skin Irritation: Repeated or prolonged contact may cause irritation.
  • Drum - 220kgs
  • Pail - 20kgs

Regional Approvals:

  • Australia
  • EU
  • Japan
  • US


  • Beach Wear Sun Care
  • Daily Wear Sun Care


Scroll right to view specs →
Name Regional Acceptance  Formula Number
Broad Spectrum SPF 40 Sunscreen CreamASEAN, Australia, Canada, EU, Japan, Korea, MERCOSUR, New Zealand, Philippines, Taiwan, USJZ5-70
Broad Spectrum SPF 50+, PA++++ O/W Sunscreen Cream for Wet SkinASEAN, Australia, Canada, EU, Japan, Korea, MERCOSUR, New Zealand, Philippines, Taiwan, USJZ11-36

Sorry, there are no documents available.

The information presented herein is believed to be accurate and reliable, but no warranty or guarantee, expressed or implied, is made regarding the information or the performance of any product. Further, nothing contained herein shall be taken as any inducement or recommendation to use, manufacture or sell that may infringe any patents or any other proprietary rights now or hereafter in existence, nor to imply compliance with any regulatory requirements

The Hallstar Company - 120 South Riverside Plaza Suite 1620 - Chicago, IL 60606-3911 USA