性状  无臭、无色、半透明、味咸的晶体或白色晶状粉末。微溶于乙醇，微溶于冷水，易溶于热水。
沸点：1575℃
熔点：741℃
折光率: 1.501
密度：  2.367
   
备注:  以上描述，仅作参考，并不表示您收到的产品，与此项描述完全相符，产品的出厂标准，请参见质量标准。
质量标准  
   anhydrous, ≥99%：

外观Appearance                          白色结晶
纯度Purity                              ≥99.0%
重金属Heavy metals (as Pb)              <50 ppm
水中不溶物Insoluble matter in H2O       <0.05 %
痕量分析Trace analysis :
Cl                                     < 500 ppm
PO4                                    < 50 ppm
Ca                                     < 200 ppm
Fe                                     < 50 ppm
Cu                                     < 50 ppm
K                                      < 500 ppm
Mg                                     < 200 ppm
Ni                                     < 50 ppm
Pb                                     < 50 ppm

99.995% metals basis:

外观Appearance                          White Powder
X-射线衍射分析X-Ray Diffraction         Conforms to Structure
纯度Purity                              ≥99.995% Based on Trace Metals Impurities 
Titration by NAOH (% B)                 21.0 - 22.0 %
ICP:                                    Confirms Na and B Components Confirmed
痕量金属分析total metallic impurities   ≤50ppm by By ICP and
  AA Combined
(Ba、Ca、Cr、Cu、Fe、Mg、Zn、Li、K、Rb、Cs)
贮存  易吸潮，密封保存。
用途  供医药、冶金、鞣革、陶瓷、纺织及制食物保存剂用。
联合国编号  
Risk：  
Safety :  S24/25 -
Hazard :