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Description
Catalogue Number	106303
Synonyms	Borax, Sodium biborate decahydrate, Sodium borate decahydrate
Description	di-Sodium tetraborate decahydrate

Physicochemical Information
Density	1.730 g/cm3
Melting Point	75 °C Elimination of water of crystallisation
pH value	9.0 – 9.5 (38.1 g/l, H₂O, 25 °C)
Vapor pressure	0.213 hPa (20 °C)
Bulk density	750 kg/m3
Solubility	49.74 g/l

Toxicological Information
LD 50 oral	LD50 Rat 2660 mg/kg
LD 50 dermal	LD50 Rabbit > 2000 mg/kg

Safety Information according to GHS
Hazard Pictogram(s)
Hazard Statement(s)	H319: Causes serious eye irritation. H360FD: May damage fertility. May damage the unborn child.
Precautionary Statement(s)	P202: Do not handle until all safety precautions have been read and understood. P264: Wash skin thoroughly after handling. P280: Wear protective gloves/ protective clothing/ eye protection/ face protection/ hearing protection. P305 + P351 + P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. P308 + P313: IF exposed or concerned: Get medical advice/ attention. P337 + P313: If eye irritation persists: Get medical advice/ attention.
Signal Word	Danger
RTECS	VZ2275000
Storage class	6.1D Non-combustible, acute toxic Cat.3 / toxic hazardous materials or hazardous materials causing chronic effects
WGK	WGK 1 slightly hazardous to water
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
Categories of danger	toxic for reproduction

Storage and Shipping Information
Storage	Store at +2°C to +30°C.

Specifications
Assay (acidimetric)	99.0 – 103.0 %
Identity	passes test
Appearance of solution	passes test
pH-value (4 %; water)	9.2 – 9.5
pH-value (5 %; water)	9.1 – 9.6
carbonate, bicarbonate	passes test
Sulfate (SO₄)	≤ 0.0050 %
Heavy metals (as Pb)	≤ 0.0020 %
Al (Aluminium)	≤ 0.0001 %
As (Arsenic)	≤ 0.0005 %
Ca (Calcium)	≤ 0.0100 %
Fe (Iron)	≤ 0.0005 %
NH₄ (Ammonium)	≤ 0.0010 %
Residual solvents (ICH Q3C)	excluded by manufacturing process
Elemental impurity specifications have been set considering ICH Q3D (Guideline for Elemental Impurities). Class 1-3 elements are not likely to be present above the ICH Q3D option 1 limit, unless specified and indicated (*).
Corresponds to Ph Eur, BP, JP, NF

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