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UV Absorber Sunsorb 328

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Chemical name: 2-(2'-hydroxy-3',5'-di-t-pentyl)phenyl)benzotriazole

Molecular formula: C22H29N3O

Molecular weight: 351.5

CAS No. 25973-55-1

EINECS No. 247-384-8                                                                                                     

Introduction:

SUNSORB 328 is a highly effective light stabilizer for variety of plastic and other organic substrates. It exhibits strong absorbance in the 300-400 nm region and minimal absorption in the visible region >400nm. It features strong UV absorption, excellent compatibility with wider variety of resins and moderately low volatility. It protects polymers as well as organic pigments from UV radiation.

 Solubility (at 20 g/100g solvent) 

Water

 <0.01

Cyclohexane

   15

Methylene chloride

56

Acetone

 6

Ethyl acetate

   16

Methanol

   0.4

Benzene

 39

N=hexane

   16

Chloroform

   44

 

Use level (for reference)

PP:  0.3 – 0.6%

 PU: 0.2 – 0.4%

 UP: 0.2- 0.4%

Rigid PVC :0.2 – 0.5%

 PC: 0.15 – 0.3%

 Flexible PVC: 0.1- 0.3%

 

Toxicity: >5000MG/KG

 

Application:

SUNSORB 328 is a highly effective light stabilizer for a variety of plastics and other organic substrates. It is used for stabilization of styrene homo- & copolymers, acrylic polymers, unsaturated , polyesters, PVC, polyolefins, polyurethanes, polyacetals, polyvinylbutyral, elastomers and adhesives.

SUNSORB 328 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 helps to preserve the original appearance and physical integrity of the substrates during outdoor weathering.

The product can be used alone or in combination with other additives such as HALS, antioxidants and other functional stabilizers and additives. The combination with HALS is particularly noteworthy in that a synergistic performance is often observed.

 

Package:

25kg carton, 7.2MT/20’FCL with pallets.

 

Storage:

It should be stored in a closed system and kept in a dry, close and shade place.

 

 


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