Phenylbenzimidazole sulfonic acid

Structural formula
General
Surname	Phenylbenzimidazole sulfonic acid
other names	Ensulizol ( INN ) 2-phenylbenzimidazole-5-sulfonic acid PHENYLBENZIMIDAZOLE SULFONIC ACID ( INCI )
Molecular formula	C 13 H 10 N 2 O 3 S
External identifiers / databases
CAS number 27503-81-7 EC number 248-502-0 ECHA InfoCard 100,044,078 PubChem 33919 ChemSpider 31267 DrugBank DB11115 Wikidata Q7181424
properties
Molar mass	274.29 g mol −1
Physical state	firmly
Melting point	> 300 ° C
solubility	sparingly soluble in water: 2.5 g · l −1
safety instructions
GHS labeling of hazardous substances H and P phrases H: 315-319-335 P: 261-280-305 + 351 + 338-304 + 340-405-501
Toxicological data	> 6,600 mg kg −1 ( LD 50 ,  rat ,  oral , sodium salt )
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Phenylbenzimidazolesulfonic ( international name Ensulizol ) is a UV filter , which is on the market since the 1934th Because of its low solubility, it must be neutralized with a strong base such as sodium hydroxide or potassium hydroxide . The Sunscreen Index as a triethanolamine salt is 8.2.

Admission

According to the German Cosmetics Ordinance, phenylbenzimidazole sulfonic acid is permitted up to a maximum concentration of 8% (calculated as acid).

Individual evidence

1. ↑ Entry on PHENYLBENZIMIDAZOLE SULFONIC ACID in the CosIng database of the EU Commission, accessed on July 6, 2020.
2. ↑ ^{a b c} data sheet 2-Phenylbenzimidazole-5-sulfonic acid monohydrate, 98% from AlfaAesar, accessed on May 26, 2014 ( PDF )(JavaScript required) .
3. ↑ ^{a b} Patent WO2007135196 : Stable soluble salts of phenylbenzimidazole sulfonic acid at phs at or below 7.0. Registered on July 9, 2007 , published on November 29, 2007 , applicant: Symrise, inventor: William Johncock, Juergen Claus. ‌
4. ↑ ^{a b c} Entry on 2-phenylbenzimidazole-5-sulfonic acid. In: Römpp Online . Georg Thieme Verlag, accessed on May 26, 2014.