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Tinuvin® PA 328

Technical Datasheet | Supplied by BASF
Tinuvin® PA 328 by BASF is phenol, 2-(2H-benzotriazol-2-yl)-4, 6-bis (1, 1-dimethylpropyl) grade. Acts as a UV absorber, belongs to hydroxyphenyl benzotriazole class. It imparts outstanding light stability to plastics and other organic substrates. Exhibits 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 ranges between 0.1-1.0%, depending on substrate and performance requirements of the final application.
Product Type
Light Stabilizers / UV Absorbers
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
  • Polymer protection > Weatherability (UV, moisture, Oxygen...)

Tinuvin® PA 328 Properties


Value & Unit
Test Condition
Test Method
Specific Gravity
1.17 g/ml
(At 20°C)
Bulk Density
0.18 g/ml
Angle of Repose
48 °

Compatiblity with other products

Find products that are predicted to be compatible with Tinuvin® PA 328.

This list of compatible products is generated out of estimated HSP values. A practical determination of these HSP values would provide higher certainty.
Learn more about Hansen Solubility Parameters (HSP) and their use in predictive formulation.

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