Polymate Additives Co. |Limited
Add: 206Shi, 101Dong, Huaqiaocheng
Pukou, Nanjing, China, 210031
Tel: +86 (0)25 570 11575
Fax: +86 (0)25 570 16494
Email: polymateadditives@gmail.com
Web: www.PolymateAdditives.com
  Phenolic Antioxidants
Plaox-1010, Plaox-1076, Plaox-1098
Plaox-1024, Plaox-3114
Organophosphite Antioxidants
  Plaox-168, Plaox-626
  Amine Antioxidants
  Plaox-BODPA, Plaox-DNDPA
Plaox-DODPA, Plaox-DCDPA
  Thioester Antioxidants
  Plaox-DLTDP, Plaox-DSTDP
  Blended Antioxidants
  Plaox-B215, Plaox-B225
  Heat stabilizers
  Pherst-TPP, Pherst-ODPP
Light stabilizers
HALS (hindered amine light stabilizers)
  Palst-770, Palst-622, Palst-944
Palst-783, Palst-791
, Palst-3529
  UVA (Ultraviolet absorbents)

Pamsorb-531, Pamsorb-P
Pamsorb-234, Pamsorb-326
Pamsorb-327, Pamsorb-328
Pamsorb-1164, Pamsorb-1577

Flame retardants
Brominated Flame retardants

Plamtar-TBBA, Plamtar-BDDP
Plamtar-DBDPE, Plamtar-BTBPOE
Plamtar-HBCD, Plamtar-TTBPC

  Halogen free Flame retardants
  Plamtar-RDP, Plamtar-BDP
Plamtar-DOPO, Plamtar-DOPO-HQ
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Light stabilizers  
    Ultraviolet absorbents    
    Pamsorb-531 | Pamsorb-P
Pamsorb-326 | Pamsorb-327 | Pamsorb-328
Pamsorb-1164 | Pamsorb-1577
    Ultraviolet absorbent Pamsorb-328    

Chemical name: 2-(2'-Hydroxy-3',5'-di-tert-amylphenyl) benzotriazole
Equivalent: Tinuvin 328 ( Ciba SC ) /Lowilite 28 (Chemtura)/ Uvinul-3028 (BASF)
Molecular formula: C22H29N3O
Molecular weight: 351.5
CAS No.: 25973-55-1
Structural formula:

Physical properties

Appearance: Slightly yellow powders
Melting range: 79 ~ 87 ˇăC

Flash point: Not available
Specific gravity (g/cm3), @20 ˇăC:0.91

Solubility (g/ 100g solvent), @20 ˇăC

Water: Insoluble
Xylene: 44
Mineral spirits:14

Methyl ethyl ketone:24
Ethtylacetate: 20
n-Butylacetate: 28



Appearance: Slightly yellow powders
Assay: 99.0% min
Melting point: 80.0 ˇăC min
Ash: 0.05% max

Volatile: 0.5% max
Transmittance (460nm): 97.0% min
Transmittance (500nm): 98.0% min


Pamsorb-328 is a UV absorbent for the UV between 270 nm and 380 nm. It is a high effective light stabilizer for a variety of plastics and other organic substrates. It is recommended as the stabilization of styrene home and copolymers, acrylic polymers, unsaturated polyesters, PVC, polyolefins, polyruethanes polyacetals, polyvinylbutyral, elastomers and adhesives.

The product can be used alone or in combination with other additives such as HALS, antioxidants and other functional stabilizers and additives. The use levels of Pamsorb-328 range between 0.10 ~ 1.0%, depending on substrate and performance requirements of the final application.




HALS (hindered amine light stablizers)
Palst-770 | Palst-622 | Palst-944 | Palst-783 | Palst-791 | Palst-3346 | Palst-3529

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