PowerSorb™ 328 CAS No. 25973-55-1

2-(2’-Hydroxy-3’,5’-di-t-amylphenyl)benzotri , azole;

2 2h benzotriazol 2 yl 4 6 ditertpentylphenol uv 328
PowerSorb™ 328 is a strong absorber of ultraviolet radiation and has a high
degree of photostability - photochemical energy absorbed in the ultraviolet
region is dissipated as thermal energy.

Technical Data of PowerSorb™ 328 CAS No. 25973 55 1
Synonyms Tinuvin 328, Uvinul 3028, Omnistab 328, Songsorb 3280,
Cyasorb UV-2337, Lowilite 28, HOSTAVIN 3310P, Eversorb 74, Chiguard 328,
EVERSTAB 328.
CAS Number 25973-55-1
EINECS Number 247-384-8
Chemical Structure
Chemical Formula C22H29N3O
Molecular Weight 352
Packing PowerSorb™ 328 is supplied in 25Kg Carton Box or 40Kg Fiber Drum.
Note All information in the leaflet is based on our present knowledge and
experience. We reserve the right to make any changes according to
technological progress or further developments. Performance of the product
described herein should be verified by testing.

We specifically disclaim any other express or implied warranty of fitness
for a particular purpose or merchantability.

We disclaim liability for any incidental or consequential damages.
Benefits & Applications of PowerSorb™ 328 cas no 25973 55 1
PowerSorb™ 328 features strong UV absorption, low initial color, good
solubility in plasticizers and monomers, moderately low volatility, and
excellent compatibility in a wide variety of substrates.

PowerSorb™ 328 can be used in combination with phenolic & phosphite
antioxidants, and HALS to optimize performance in outdoor use.

PowerSorb™ 328 is suitable for use in polyolefins, PVC, styrene homo and
copolymers, ABS, acrylic polymers, unsaturated polyesters, thermoplastic
urethanes, moisture cured polyurethanes, polyacetals, polyvinylbutyral, two
component epoxies and urethanes, oil alkyds and thermosetting acrylic
enamels.

Physical Properties of PowerSorb™ 328 25973 55 1 cas
Appearance Pale yellow powder
Specific Gravity [20°C] 1.17
Melting Point (°C) 79-83
Boiling Point (°C) 477.8
Flash Point (°C) 229
Vapour Pressure (25°C, Pa) 4.3E-9
Volatile Loss (%) Max.0.5
Color of Solution 460nm (%) Min.97
Color of Solution 500nm (%) Min.98
Ash (%) Max.0.1
Purity (%) Min.99
Solubility of PowerSorb™ 328 CAS No. 25973-55-1
Solubility [20°C] % w/w
Acetone 6
Benzene 39
Butyl Carbitol 3.5
Butanol 2.5
Butyl acetate 15
Chloroform 44
Cyclohexane 56
Dichloromethane 56
Ethanol 0.6
Ethyl acetate 20
Ethyl glycol 4
n-Hexane 16
MEK 14
Methanol 0.4
Methyl ethyl ketone 24
Mineral spirits 14
Styrene 34
Water <0.01
Xylene 34

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