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Tinuvin® PA 328 FF

Technical Datasheet | Supplied by BASF
Tinuvin® PA 328 FF by BASF is a phenol, 2-(2H-benzotriazol-2-yl)-4, 6-bis (1, 1-dimethylpropyl) grade. Acts as a UV absorber, Belongs to hydroxyphenyl benzotriazole class, which imparts outstanding light stability to plastics and other organic substrates. Features strong UV absorption, low initial color, excellent compatibility in a wide variety of substrates, good solubility in plasticizers and monomers, and moderately low volatility. It protects polymers as well as organic pigments from UV radiation, helping to preserve the original appearance and physical integrity of molded articles, films, sheets, and fibers during outdoor weathering. Recommended for the stabilization of styrene homo- and copolymers, acrylic polymers, unsaturated polyesters, polyvinyl chloride, polyolefins, polyurethanes, polyacetals, polyvinyl butyral and elastomers. Use levels of Tinuvin® PA 328 FF ranges between 0.1-1.0%, depending on substrate and performance requirements of the final application.
Product Type
Light Stabilizers / UV Absorbers > Benzotriazoles
Chemical Composition
Phenol, 2-(2H-benzotriazol-2-yl)-4, 6-bis (1, 1-dimethylpropyl)
CAS Number
Physical Form
Product Status
Applications/ Recommended for
  • PVC
  • UPR
  • Other Thermoplastic > POM (Polyacetal)
  • PMMA
  • Fibers/ Textiles/ Carpets > Fibers
  • Polymer protection > Weatherability (UV, moisture, Oxygen...)

Tinuvin® PA 328 FF Properties


Value & Unit
Test Condition
Test Method
Specific gravity @ 20°C
1.17 g/ml
Bulk density
0.18 g/ml
Angle of repose
48 °
SpecialChem additionnal informations based on CAS Number : 25973-55-1

Hansen Solubility Parameters

[18.2, 3.9, 3.7]
[δD - Dispersion force interactions, δP - Polar force interactions, δH - Hydrogen bond force interactions]

Please note, these HSP values are estimations. It is based upon the “like seeks like” principle. It splits an ingredients interactions into three parameters; δD (Dispersion force interactions), δP (Polar forces interactions) and δH (Hydrogen bond force interactions). Hansen Solubility Parameters can help you find a wide range of products that are predicted to be compatible with Tinuvin® PA 328 FF. A practical determination of these HSP values would provide higher certainty. Learn More.

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