Product Description

Belguard PBSA (Phenylbenzimidazole sulfonic acid) is a UV-B filter that absorbs UV light between 280-340 nm to protect skin from sunburn and cancer. Due to its water solubility, it fits perfectly for sun care without oil or exceeding the contents of oil. It is compatible with almost all cosmetic ingredients. It is always used in combination with other UV filters like Avobenzone, Titanium oxide, Zinc Oxide etc.


Product Name Phenylbenzimidazole Sulfonic acid
CAS No. 27503-81-7
EINECS No. 248-502-0
Chemical Name 2-Phenyl-3H –Benzimidazole -5-Sulfonic acid
Chemical Formula C 13 H 10 N 2 O 3 S
Molecular Weight 274.3
Synonyms 2-Phenyl benzimidazole-5-sulphonic acid, Ensulizole (USA), Eusolex 232 (Merck), Neo Heliopan Hydro (Symrise), PBSA
Structure Phenylbenzimidazole Sulfonic acid

Technical Data

Description Parameter
Appearance White to Pale beige Powder
Odour Almost odourless
Assay w/w 98% - 102 %
Loss on drying w/w < 2%
Specific Absorbance (1%,1cm,@302±2nm) 920 – 990
Total Aerobic count
Total Yeast & Mould count
Max 100 CFU /gram
Max 10 CFU / gram


In USA up to 4%, In Europe & Canada up to 8%, In Japan up to 3% and in China and India up to 4%.


Store in tightly closed containers in cool & dry conditions. Keep away from direct sunlight.

Expiry Date

Two years from the date of manufacturing.


25 Kg in Cartons.