Chemical Identification
Common Name
Borax
中文通用名
硼砂
IUPAC
disodium tetraborate decahydrate
CAS
borax
CAS No.
1303-96-4
Molecular Formula
B4H20Na2O17
Physical Properties
Molecular weight:381.4; Physical form:Colourless crystalline solid, efflorescent at low r.h. Density:1.71 (20 °C); Melting point:742 °C (anhydrous sodium tetraborate); Flash point:A fire retardant; Solubility:In water 47.1 g/l ( pH 9.3, 20 °C). Soluble in glycerol and ethylene glycol. Insoluble in ethanol.; Stability:Stable. When heated above c. 62 °C, borax loses water of crystallisation, first forming the pentahydrate and then anhydrous sodium tetraborate.;
Toxicology
Oral:Acute oral LD50 for rats 4500-6000 mg/ kg. Percutaneous:Acute percutaneous LD50 for rabbits >10 000 mg/kg. Not an eye or skin irritant. Phytotoxicity:Not to be used near desired plants.
Environmental Profile
Ecotoxicology: 
Bees:Not hazardous to bees.Daphnia:LC50 (48 h) 1170 mg/l (disodium tetraborate decahydrate).Fish: LC50 (24 d) for rainbow trout 1320 mg/l (disodium tetraborate decahydrate). 

Environmental fate:
 Animals:Not metabolised in animals.Soil:No microbial degradation. Disappearance from soil is by washing out. Persistence in soil is ×2 y, depending on rainfall and soil structure.
Transport Information
Signal Word:WARNING; Hazard Class:II(Moderately hazardous)

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