Benzophenone-4

Benzophenone-4
chemical name: 2-benzoyl-5-methoxy-1-phenol-4-sulphonic acid
molecular formula: c14h11o6s
molecular weight: 308.31
cas no: 4065-45-6
specification:
appearance: white or light yellow crystalline powder
assay: 99.0% min.
heavy metals: 5ppm max.
colour (gardner-10% aqueous solution): 1.0 max.
loss on drying:
ph value: 1.2-2.2
uv absorbance max @285nm: 460 min.
uv absorbance max @325nm: 290 min.
melting point: > 140c.
turbidity in water (ebc): 1.5 max
package: 25kg net cardboard drum
storage: preserve in tight, light-resistent containers
shelf life: 2 years
uv-light absorber series
they are kind of broad-spectrum ultraviolet absorber, owns characteristics such as: high absorption efficiency, innocuity, good stability to heat, light. As the type I sunscreen agent approved by fda in the us, it can absorb uv-a and uv-b at the same time. It is widely used in the sunfast cream, sunfast milk, sunfast latex, sunfast oil etc.
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