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BASF Light Stabilizers to prevent polymer degradation

Light stabilizers and UV absorbers are designed to solve the polymers degradation issues caused by exposure to sunlight. BASF has developed a comprehensive range of light stabilizers and UV absorbers to meet the requirements of various markets and applications (Agriculture, Automotive, Building & Construction and others).

Light stabilizers & UV absorbers

BASF Light Stabilizers to prevent polymer degradation

Exposure to sunlight and some artificial lights can have adverse effects on the integrity and the durability of plastics articles. UV radiation can break down the chemical bonds in a polymer. This process is called photodegradation and ultimately causes cracking, chalking, color changes and the loss of physical properties such as impact strength, tensile strength, elongation and other properties.
Polymer before exposure to sunlight Polymer after exposure to sunlight
Figure 1: Polymer before exposure to sunlight Figure 2: Polymer after exposure to sunlight

There is one effective solution to prevent polymer from photodegradation: the use of light stabilizers.

BASF has developed a comprehensive range of light stabilizers and UV absorbers to meet the requirements of various markets and applications.

What causes polymer degradation?

Solely the UV radiation of the solar spectrum has enough energy to degrade a polymer. According to the 1st law of the photochemistry, light must be absorbed by a chemical substance in order for a photochemical reaction to take place.

The UV radiation on the globe varies with latitude, altitude and seasons as shown in Figure 3:

Figure 3: Annual UV radiation on the globe

Weathering of plastics includes, in addition to the effect of UV radiation, environmental factors like temperatures, precipitations, contaminants and others:
  • Polyolefins absorb UV light only because of impurities present in the polymer, oxidation products formed during processing or additives and pigments used in the formulation of a finished article.
  • On the other hand, other polymers like Engineering Plastics and Rubbers absorb UV-light because of their intrinsic chemical structure (e.g. Polystyrene, Polyesters, ...)

How do UV and Light stabilizers work?

To counteract these damaging effects on plastics performance, a broad range of UV stabilizers designed to solve the degradation problems associated with exposure to sunlight have been developed.
Although you can find many types of UV stabilizers, they can be categorized into two general classifications:

Ultraviolet Light Absorbers (UVA) to retard photodegradation

UVAs slow down the degradation process by preferentially absorbing harmful ultraviolet radiation and dissipating it as thermal energy.

Figure 4: UV radiation absorption

The absorption of UV Light is governed by the Law of Lambert-Beer:

Absorbance = Molar Absorptivity · Concentration · Path Length

or A = ε.c.l = log 1/T where T (transmittance) = I/Io (Io is the initial light intensity)

To obtain an optimal absorption and thus effectively retard photodegradation, it is required to have high concentrations of absorbers and sufficient polymer thickness.

UV Absorbers are therefore effective:

  • At protecting the polymer bulk
  • At protecting the content when used in packaging films or bottles
  • At protecting other additives, more sensitive to UV light (e.g. pigments and flame retardants)
  • In UV absorbing substrates, such as polystyrenes, polyesters, etc.

However, they are less effective at protecting surfaces (crazing) and very thin articles such as film/fiber.

Hindered Amine Light Stabilizers (HALS) to inhibit polymer degradation

HALS are very efficient stabilizers for polymers and especially polyolefins. They do not absorb UV radiation, but act to inhibit degradation of the polymer. Significant levels of stabilization are achieved at relatively low concentrations. HALS' high efficiency and longevity are due to a cyclic process wherein the HALS are regenerated rather than consumed during the stabilization process.

Figure 5: Cyclic process - HALS regeneration

HALS are therefore:

  • Very effective in high surface area applications such as film and fiber
  • The most effective additive for the light stabilization of polyolefins
  • Also highly effective thermal stabilizers for longer polyolefin articles service life

UVAs and HALS synergy to enhance light stability

In some applications, combinations of UVAs and HALS create a synergistic interaction that may enhance light stability of a plastic article. Other additives could also have their importance in the light stability performance of a UVA - HALS system and particularly the process stabilization package.

A variety of UV Absorbers and HALS have been developed to meet polymer and specific applications requirements. High molecular weight products were commercialized to address issues like volatility and migration of light stabilizers. The selection of the optimal UV Stabilizer will depend on the polymer type, the thickness, the use of pigments and other additives and of course the expected lifetime in a specified environment.

Browse the BASF UV & light stabilizers selector to find the most appropriate solutions according to the polymer, the application and the processing mode!

Find out how BASF UV & Light stabilizers can help you meet the needs of various markets:

HALS as HATS

Light stabilizers solutions for Agricultural films

Protect Synthetic Fibers with Light stabilizers

BASF Light Stabilizer solutions for Building and Construction Applications

Synergies between Light Stabilizers and Antioxidants

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Product Datasheets

Uvinul® 5050 H

Uvinul® 5050 H by BASF is a high molecular weight, oligomeric hindered amine light stabilizer (HALS). It is alpha-alkenes(C20-C24) maleic anhydride-4-amino-2,2,6,6-tetramethylpiperidine, polymer. It shows excellent polymer compatibility and good extraction resistance. It exhibits high compatibility ...

Tinuvin® XT 100 FF

Tinuvin® XT 100 FF by BASF is a high performance light stabilizer system based on high molecular weight hindered amine NOR™ light stabilizer. It is cost effective and is designed to provide stabilization to greenhouse and mulch films for a longer lifetime. It shows a good performance even in presenc...

Tinuvin® XT 55

Tinuvin® XT 55 by BASF is a hindered amine light stabilizer (HALS). It is a high-performance light stabilizer, which imparts outstanding weatherability to polyolefins. The main advantage of Tinuvin® XT 55 UV & light stabilizer is its well-balanced property profile combining light and thermal stabili...

Chimassorb® 2020

Chimassorb® 2020 by BASF is a high molecular weight hindered amine light stabilizer (HALS). Offers an optimal combination of exceptional levels of UV- and long-term thermal stability and ancillary properties such as minimal pigment interaction and improved melt flow control. Chimassorb® 2020 is a hi...

Tinuvin® 1600

Tinuvin® 1600 by BASF is 2-hydroxyphenyl-s-triazine derivative. It acts as an ultraviolet light absorber (UVA). It exhibits very low volatility, excellent thermal stability and high extinction coefficient. Tinuvin® 1600 light stabilizer allows polycarbonates, polyesters, and acrylics to achieve a hi...

Tinuvin® NOR® 371

Tinuvin® NOR® 371 by BASF is a high molecular weight hindered amine NOR stabilizer (NOR HALS). This high-performing light stabilizer is particularly well suited for applications in contact with chemicals, like in agriculture, such as greenhouse and mulch films or nonwovens. Tinuvin® NOR™ 371 provide...

Chimassorb® 81 FL

Chimassorb® 81 FL by BASF is a benzophenone grade. Acts as a UV absorber. Imparts good light stability when used in combination with hindered amine light stabilizer (HALS) of Chimassorb®, Tinuvin® or Uvinul® range. Protects a number of other polymers against degradation caused by light exposure such...

Chimassorb® 81 P

Chimassorb® 81 P by BASF is benzophenone which acts as a UV absorber. It imparts good light stability when used in combination with a hindered amine light stabilizer (HALS) of the Chimassorb®, Tinuvin® or Uvinul® range. Shows good compatibility with polyolefins and plasticized PVC. Protects a number...

Chimassorb® 944 FDL

Chimassorb® 944 FDL by BASF is a poly[[6-[(1,1,3,3-tetramethylbutyl)amino]-1,3,5-triazine-2,4-diyl][(2,2,6,6-tetramethyl-4-piperidinyl)imino]-1,6 hexanediyl[(2,2,6,6-tetramethyl-4-piperidinyl)imino]]). It is a high molecular weight oligomeric hindered amine light stabilizer (HALS) and heat stabilize...

Chimassorb® 944 LD

Chimassorb® 944 LD by BASF is poly[[6-[(1,1,3,3-tetramethylbutyl)amino]-1,3,5-triazine-2,4-diyl][(2,2,6,6-tetramethyl-4-piperidinyl)imino]-1,6 hexanediyl[(2,2,6,6-tetramethyl-4-piperidinyl)imino]]). It is a high molecular weight oligomeric hindered amine light stabilizer (HALS) and heat stabilizer. ...

Irgastab® PUR 70

Irgastab® PUR 70 by BASF is a BHT- & amine-free heat stabilizer blend for polyols. It exhibits good resistance to scorch, fogging and textile staining. Offers low VOC & FOG emissions, outstanding gas-fading resistance and extremely low light-induced discoloration. It allows dust free handling, autom...

Tinuvin® 111

Tinuvin® 111 by BASF is a synergistic mixture of a methylated high molecular weight hindered amine light stabilizer (HALS) and oligomeric Tinuvin® 622. Acts as an excellent UV stabilizer. Exhibits outstanding extraction resistance, low gas fading and low pigment interaction. Provides exceptional anc...

Tinuvin® 120

Tinuvin® 120 by BASF is benzoic acid, 3, 5-(1, 1-dimethylethyl)-, 2, 4-bis (1, 1-dimethyethyl) phenyl ester grade. It acts as a light stabilizer. Because of its lack of absorption in the visible range, it has virtually no effect on the initial color of the substrate. In colorless or pale colored sys...

Tinuvin® 1577 ED

Tinuvin® 1577 ED by BASF is a hydroxyphenyl triazine grade. Acts as a UV absorber. Exhibits very low volatility and good compatibility with a variety of polymers, co-additives and resin compositions. Allows polycarbonates and polyesters to achieve a higher resistance to weathering than conventional ...

Tinuvin® 213

Tinuvin® 213 by BASF is reaction products of methyl 3-(3-(2H-benzotriazole-2-yl)-5-t-butyl-4-hydroxyphenyl) propionate/ PEG 300. It acts as a UV absorber belonging to hydroxyphenyl benzotriazole class which imparts good light stability to a variety of polymers. It is a pumpable liquid useful in a va...

Tinuvin® 234 P

Tinuvin® 234 P by BASF is chemically phenol, 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl) grade. Acts as a UV absorber. It is a high molecular weight product belonging to hydroxyphenyl benzotriazole class. Imparts excellent light stability to a variety of polymers. Features low volatilit...

Tinuvin® 234 FF

Tinuvin® 234 FF by BASF is chemically phenol, 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl) grade. Acts as an UV absorber. It is a high molecular weight product belonging to hydroxyphenyl benzotriazole class. Imparts excellent light stability to a variety of polymers. Features low volatil...

Tinuvin® 312

Tinuvin® 312 by BASF is chemically Ethanediamide, N-(2-ethoxyphenyl)-N'-(2-ethylphenyl) grade. It acts as a UV absorber belonging to oxanilide class. Imparts outstanding light stability to plastics and other organic substrates. Features strong UV absorption, excellent compatibility in a wide variety...

Tinuvin® 326 P

Tinuvin® 326 P by BASF is chemically phenol, 2-(5-chloro-2H-benzotriazol-2-yl)-6-(1,1-dimethylethyl)-4-methyl. It acts as a UV absorber belonging to hydroxyphenyl benzotriazole class which imparts good light stability to a variety of polymers. Especially suited for polyolefins. It has a wide range o...

Tinuvin® 326 FL

Tinuvin® 326 FL by BASF is chemically phenol, 2-(5-chloro-2H-benzotriazol-2-yl)-6-(1,1-dimethylethyl)-4-methyl. It acts as a UV absorber belonging to hydroxyphenyl benzotriazole class which imparts good light stability to a variety of polymers. Especially suited for polyolefins. It has a wide range ...

Tinuvin® 329

Tinuvin® 329 by BASF is chemically 2 Phenol, 2-(2H-benzotriazol-2-yl)-4-(1, 1, 3, 3-tetramethylbutyl) grade. It acts as a UV absorber belonging to hydroxyphenyl benzotriazole class. It is an effective light stabilizer for a variety of plastics and other organic substrates. Protects polymers from UV ...

Tinuvin® 329 FL

Tinuvin® 329 FL by BASF is chemically 2phenol, 2-(2H-benzotriazol-2-yl)-4-(1, 1, 3, 3-tetramethylbutyl) grade. It acts as an UV absorber belonging to hydroxyphenyl benzotriazole class. It is an effective light stabilizer for a variety of plastics and other organic substrates. Protects polymers from ...

Tinuvin® 360

Tinuvin® 360 by BASF is chemically phenol, 2, 2’-methylene-bis (6-(2H-benzotriazol-2-yl)-4-(1, 1, 3, 3-tetramethylbutyl)) grade. Acts as a UV absorber. It is a very low volatile product of hydroxyphenyl benzotriazole class, imparting outstanding light stability to a variety of polymers. Particularly...

Tinuvin® 360 ED

Tinuvin® 360 ED by BASF is chemically phenol, 2, 2’-methylene-bis (6-(2H-benzotriazol-2-yl)-4-(1, 1, 3, 3-tetramethylbutyl)) grade. Acts as an UV absorber. It is a very low volatile product of hydroxyphenyl benzotriazole class, imparting outstanding light stability to a variety of polymers. It is su...

Tinuvin® 494 AR

Tinuvin® 494 AR by BASF is a proprietary mixture of a methylated high molecular weight hindered amine light stabilizer (HALS) and co-additives. It is an excellent UV stabilizer with outstanding pesticide/insecticide resistance. Tinuvin® 494 AR is particularly well suited for agricultural film applic...

Tinuvin® 571

Tinuvin® 571 by BASF is a liquid benzotriazole UV absorber. Imparts good light stability to a variety of polymers. Features high compatibility in various substrates, low volatility even at elevated temperatures, and high absorption and protection efficiency. Highly soluble in many solvents, monomers...

Tinuvin® 622 SF

Tinuvin® 622 by BASF is an oligomeric hindered amine light stabilizer (HALS). Furthermore, it is effective as antioxidant and contributes significantly to the long-term heat stability of polyolefins and tackifier resins. Used for all applications calling for low volatility and minimal migration, bec...

Tinuvin® 765

Tinuvin® 765 by BASF is a mixture of bis(1,2,2,6,6-pentamethyl-4-piperidyl)sebacate and methyl 1,2,2,6,6-pentamethyl-4-piperidyl sebacate. It is a liquid hindered amine light stabilizer which is widely used to improve the weatherability of a variety of polymers including polyurethanes, elastomers, u...

Tinuvin® 770 DF

Tinuvin® 770 DF by BASF is bis(2,2,6,6,-tetramethyl-4-piperidyl)sebaceate. It is a low molecular weight hindered amine light stabilizer (HALS) for applications demanding particularly high light stability. It provides excellent light stability for thick sections but can also be used for articles with...

Tinuvin® 783 FDL

Tinuvin® 783 FDL by BASF is a synergistic mixture of Chimassorb® 944 and Tinuvin® 622. It is a versatile light stabilizer with good extraction resistance, low gas fading and low pigment interaction. It is particularly well suited for LDPE, LLDPE, HDPE films, tapes and thick sections and for PP films...

Tinuvin® 791 FB

Tinuvin® 791 FB by BASF is a synergistic mixture of Chimassorb® 944 and Tinuvin® 770. It is an excellent light stabilizer especially for PP thick sections, which offers excellent surface protection. It also shows high stabilization efficiency in PP tapes. Its areas of application are PP, blends of p...

Tinuvin® B 75

Tinuvin® B 75 by BASF is a synergistic blend of 20% Irganox 1135, 40% Tinuvin® 571 and 40% Tinuvin® 765. Acts as a light and heat stabilizer agent. It is an easy to pump, pourable liquid allowing dust free handling, automated dosage and shortening of mixing time. Exhibits resistance to exudation/ cr...

Tinuvin® P

Tinuvin® P by BASF is phenol, 2-(2H-benzotriazol-2-yl)-4-methyl grade. Acts as a UV absorber. It belongs to hydroxyphenyl benzotriazole class, imparting good light stability to a wide variety of polymers. Offers strong absorption of ultraviolet radiation in 300-400 nm region. Exhibits high degree of...

Tinuvin® PA 123

Tinuvin® PA 123 by BASF is decanedioic acid, bis(2,2,6,6-tetramethyl-1-(octyloxy)-4-piperidinyl)ester, reaction products with 1,1-dimethylethylhydroperoxide and octane. It is a low molecular weight hindered amine NOR stabilizer. Its low basicity is thus preventing possible interactions with acidic o...

Tinuvin® PA 144

Tinuvin® PA 144 by BASF is a bis(1,2,2,6,6-pentamethyl-4-piperidinyl)-2-butyl-2-(4-hydroxy-3,5-di-tert-butylbenzyl)propanedioate. It is a highly efficient hindered amine light stabilizer and is also effective as antioxidant. It provides significantly extended lifetime to plastics and rubber articles...

Tinuvin® PA 328

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, ex...

Tinuvin® PA 328 FF

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 c...

Tinuvin® PUR 866

Tinuvin® PUR 866 by BASF is a high performance light stabilizer package. Offers UV stabilization for polyurethane systems (e. g. thermoplastic polyurethane (TPU), elastomers, RIM flexible foam applications). Shows excellent initial color, superior color retention during UV exposure, enhanced long-te...

Tinuvin® XT 200 FF

Tinuvin® XT 200 FF by BASF is a hindered amine derivative. It is a novel high performance light stabilizer system based on high molecular weight hindered amine NOR™ light stabilizer. It is an excellent UV/thermal stabilizer and is particularly well suited for agricultural film applications, such as ...

Tinuvin® XT 835 FF

Tinuvin® XT 835 FF by BASF is hindered amine derivative. It is a high performance light stabilizer system that is fully REACH compliant. It maintains its activity in acidic environments where conventional HALS performance may be reduced. It also helps to protect PVC from the harmful effects of UV li...

Tinuvin® XT 847 FF

Tinuvin® XT 847 FF by BASF is hindered amine derivative. It is a novel NOR-HALS based high performance light stabilizer system that represents a significant advancement in light stabilization of polyolefins, especially for flexible TPO compositions used in membrane applications. In addition to the s...

Tinuvin® XT 850 FF

Tinuvin® XT 850 FF by BASF is a hindered amine derivative. It imparts outstanding weatherability to polyolefins. It does not interact with acid-cured 1-component automotive coatings and other acidic components. Its excellent compatibility with polyolefins provides benefits such as good resistance to...

Tinuvin® XT 855 FF

Tinuvin® XT 855 FF by BASF is hindered amine derivative. It is a high performance, non-interacting light stabilizer system which imparts outstanding weatherability to polyolefin based compounds, even in presence of acidic species. It also contributes significantly to the long-term thermal stability ...

Uvinul® 3030 P

Uvinul® 3030 P by BASF is a 1, 3-bis-((2’-cyano-3’, 3’-diphenylacryloyl) oxy)-2, 2-bis-(((2’-cyano-3’, 3’-diphenylacryloyl) oxy) methyl)-propane grade. Acts as a UV absorber. It is a low volatile grade belonging to cyanoacrylate class, imparting excellent light stability to engineering polymers. Fea...

Uvinul® 3030 FF

Uvinul® 3030 FF by BASF is a 1, 3-bis-((2’-cyano-3’, 3’-diphenylacryloyl) oxy)-2, 2-bis-(((2’-cyano-3’, 3’-diphenylacryloyl) oxy) methyl)-propane grade. Acts as a UV absorber. It is a low volatile grade belonging to cyanoacrylate class, imparting excellent light stability to engineering polymers. Fe...

Uvinul® 3035

Uvinul® 3035 by BASF is an ethyl-2-cyano-3, 3-diphenyl acrylate grade. Acts as an UV absorber. Belongs to cyanoacrylate class, imparting excellent light stability to a variety of polymers. Offers exceptional light absorbing characteristics and good compatibility in various substrates. The product ha...

Uvinul® 3039

Uvinul® 3039 by BASF is ethyl-2-cyano-3, 3-diphenyl acrylate grade. Acts as an UV absorber. Belongs to cyanoacrylate class, imparting excellent light stability to a variety of polymers. Suitable for the stabilization of PVC-p and PVC plastisols. It can also be used in PUR, polyesters and PMMA. Use l...

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