send us an inquiry

LC5256 di-Sodium tetraborate decahydrate

suitable for use as excipient exp


Order number Packaging Quantity Price €
AC32256 Plastic bottle 1 kg inquire
AC32256 Double PE Sack 25 kg inquire


Product information
Synonyms Borax, Sodium biborate decahydrate, Sodium borate decahydrate
Hill Formula B4Na2O7*10H2O
Chemical formula Na2B4O7*10 H2O
HS Code 2840 19 90
EC number 215-540-4
Molar mass 381.32 g/mol
EC index number 005-011-01-1
CAS number 1303-96-4


Chemical and physical data
Solubility 51.4 g/l (20 °C)
Melting point 75 °C Elimination of water of crystallisation
Molar mass 381.32 g/mol
Density 1.72 g/cm3 (20 °C)
Bulk density 750 kg/m3
pH value 9.2 (47 g/l, H2O, 20 °C)
Vapor pressure 0.213 hPa (20 °C)


Safety information according to GHS
Hazard Statement(s) H360FD: May damage fertility. May damage the unborn child.
Precautionary Statement(s) P201: Obtain special instructions before use.
P308 + P313: IF exposed or concerned: Get medical advice/ attention.
Signal Word Danger
Hazard Pictogram(s)
RTECS VZ2275000
Storage class 6.1B Non combustible substances, toxic
WGK WGK 1 slightly water endangering
Disposal 3
Relatively unreactive organic reagents should be collected in container A. If halogenated, they should be collected in container B. For solid residues use container C.


Safety information
R Phrase R 60-61
May impair fertility.May cause harm to the unborn child.
S Phrase S 53-45
Avoid exposure – obtain special instructions before use.In case of accident or if you feel unwell, seek medical advice immediately (show the label where possible).
Categories of danger toxic for reproduction
Hazard Symbol Toxic


Toxicological data
LD 50 oral LD50 rat 2660 mg/kg
LD 50 dermal LD50 rabbit > 2000 mg/kg


Assay (acidimetric) 99.0 – 103.0 %
Identity conforms
Appearance of solution conforms
pH-value (4 %, water) 9.2 – 9.5
carbonate, bicarbonate conforms
Sulphate (SO4) ≤ 0.005 %
Heavy metals (as Pb) ≤ 0.002 %
As (Arsenic) ≤ 0.0005 %
Ca (Calcium) ≤ 0.01 %
NH4 (Ammonium) ≤ 0.001 %
Residual solvents (Ph.Eur./USP/ICH) excluded by manufacturing process