RayFlex® 439A

Styrene Acrylic Emulsion

RayFlex 439A is a soft styrene acrylic emulsion polymer with excellent tensile strength and elongation for roof and mastic applications. It is designed to provide compatibility with bentonite stabilized asphaltic emulsions for increased durability and flexibility.

Key Features
  • Excellent tensile properties
  • Good adhesion
RayFlex® 439A Typical Physical Properties
Polymer Type Styrene acrylic emulsion polymer
Weight Solids 45%
Viscosity (Brookfield Model RVT) 2500 cps, #6/100 rpm
pH 8.0
Tg (MDSC) -20°C
MFFT (ASTM D-2354) <0°C
Particle size (Mean) 0.12 microns
Surfactant charge Anionic
Weight per gallon 8.63 lbs/gal
Freeze thaw stability Do Not Freeze
Download Technical Data Sheet


If any product is defective in workmanship or materials, Specialty Polymers, Inc. will replace the product. The information contained in this Technical Bulletin is intended to be a guideline. It is offered in good faith, but without guarantee. We recommend users of the product perform their own testing to determine the suitability of the product in their application.