di-Sodio tetraborato decaidrato, Pharmpur®, Ph Eur, BP, NF

- Synonyms: Borax, Sodium biborate decahydrate, Sodium borate decahydrate
- Na2B4O7·10H2O
- M = 381,37 g/mol
- CAS [1303-96-4]
- EINECS-No.: 215-540-4
- Solub. in water: (20 ºC): 51,4 g/l
- Melting point: 75 ºC
- Boiling point: 1575 ºC (anhydrous)
- Vapour pressure: (20 ºC) 0,213 hPa
- LD 50 (oral, rat): 2660 mg/kg
- GHS-signal word: Danger
- GHS-H sentences: H319 - H360FD
- GHS-P sentences: P280 - P305+P351+P338 - P308+P313 - P337+P313 - P405 - P501a
- Tariff number: 2840 19 90 00
- Applications: reference material, for calibrating pH-meters, for pharmaceutical use.

SPECIFICATIONS
assay (acidimetric): 99,0 - 103,0 %
Identification sodium: passes test
Identification borate: passes test
Identification A (EP): passes test
Identification B (EP): passes test
appearance of solution: clear and colourless
pH (4 %, H2O): 9,0 - 9,6
carbonate, bicarbonate: passes test
sulfates (SO4): max. 50 ppm
ammonium (NH4): max. 10 ppm
arsenic (As): max. 5 ppm
calcium (Ca): max. 100 ppm: