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Product name: Sodium Hydrosulphite
Other name: Sodium disulfite
CAS NO: 7775-14-6
Molecular formula: Na2O4S2
Molecular weight: 174.1071
Structural formula：
 

Chemical Name：2,2'-(1, 4-phenylene) di4h-3, 1-benzoxazine-4-one
Molecular formula：C22H12N2O4
Molecular weight：368.34
Structural formula：
 
CAS NO：18600-59-4
Content：more than 99%
Melting point：310-315℃
Ash content：less than 0.1%
Volatile matter：less than 0.3%

Chemical Name: 2-(4,6-Diphenyl-1,3,5-triazin-2-yl)-5-[(hexyl)oxy]-phenol
Molecular Formula C25H27N3O2
Molecular Weight 425.25
CAS NO.: 147315-50-2Applications: Triazine type UV light absorber has very low volatility , but has good compatibility with other additives. As the ultraviolet absorption agent , it is available to acrylate , PVC , polyester and polyethylene high capability polymer etc.
Specification:
Appearance Lightly yellow powder
Assay ≥ 99%
Melting point 148-150°C
Loss on drying ≤ 0.1%
Ash ≤ 0.05%
PSD＞4000um ≤ 1.0%
Transmittance(2%Toluene solution) 450nm≥ 88%, 500nm≥ 98.5%
Solubility :soluble in chloroform, diphenylmethane, methylbenzene, ethyl acetate, slightly soluble in hexyl alcohol, ethanol.
Storage and transportation :
The chemical stability is good. It can be stored and transported according to the general chemical matter regulation.
Packing: 25kg cartons or durm(PE plastic inside)

Chemical name : 2- (2'-Hydroxy-5'-tert-octylphenyl)benzotriazole 
Formula : C20H25N3O
Molecular Weight : 323
CAS NO : 3147-75-9
Specification:
Appearance : white powder
Assay: 99%Min
Melting Range : 103-105 °C
Transmittance:  @440nm≥ 97 %；@500nm≥ 98%
Ash: 0.1%Max
Loss on drying: 0.5%Max
Introduction : UV-329 is a benzotriazole type ultraviolet light absorber (UVA), imparting good light stability for plastics and other organic polymers. UV-329 is an effective light stabilizer for a variety of plastics and other organic substrates.
Solubility At 20 °C (g/100ml solvent)

Chemical name：2-(2H-benzotriazol-2-yl)-4,6-di-tert-pentylphenol
Molecular formula：C22H29N3O
Molecular weight：351.5
Structural formula：
 
CAS NO：21615-48-6
Content：≥99%
Melting point：80-83℃
Dry weight loss：≤0.5%
Ash content：≤0.1%
Appearance：White - light yellow powder
Solubility：Dissolved in benzene, toluene, styrene, cyclohexane, methyl methacrylate, ethyl acetate, ketone and other organic solvents.
Transmittance：460nm≥97%; 500nm≥98%
Features and Uses：Uv-328 is an efficient UV absorber with a maximum UV absorption peak of 345nm. Its photostability is similar to that of UV-326 and UV-327. However, it has a good miscibility with resins, low thermal volatilization, and high scrubber resistance. The general dosage is about 1%. It also has excellent light stabilization effect in various coatings.
Packing：20 or 25 kg cardboard drum or carton packing.

Important points about UV absorbers:
UV absorbers are compounds added to materials to protect them from the harmful effects of ultraviolet (UV) radiation. Ultraviolet radiation from the sun can cause serious damage to a variety of materials, including plastics, paints, textiles, and even human skin. The primary function of UV absorbers is to absorb UV rays and dissipate them as low levels of heat, thereby preventing degradation or other harmful effects of UV radiation.

Chemical name: 2-(2'-Hydroxy-3'-tert-5'-methylphenyl)-5-chlorobenzotriazole

CAS NO:  3896-11-5
Introduction:
UV-326 is a benzotriazole type UV absorber. It has a high absorption in the wavelength
of 290~400nm. It is also efficient for the light stabilization of polyvinyl chloride, unsaturated
polyurethane, polystyrene, polycarbonate, coatings and lacquers.

Specification:
.Appearance: slightly yellowish powder
.Melting Point: 137~142℃
.Content (HPLC) : 99% Min.
.Transmittance: 460nm≥97%   500nm≥98%
.Ash: 0.1% Max.
.Loss on drying: 0.5% Max.