无水物为白色结晶，容易潮解。工业品因含杂质常为粉红、棕红色、土黄色块。 溶于水（10℃时溶解度为15.4g/100ml水，90℃时溶解度为57.2g/100ml水）。微溶于醇，不溶于醚。水溶液呈强碱性。溶于硫黄生成多硫化钠。
熔点  50 °C 
沸点  920°C 
密度  1.427
 

Q/(HG)SJ 690-95
99.99% metals basis:


外观Appearance                                       Colorless to White Crystals and/or Chunks 
X-射线衍射分析X-Ray Diffraction           Conforms to Structure 
纯度Purity                                                     ≥99.99% Based on Trace Metals Impurities
含量Assay(Titration by Na2S2O3)         98.0 - 102.0 % 
铵盐Ammonium (NH4)                           ≤0.005 % 
亚硫酸盐和硫代硫酸钠Sulfite and Thiosulfite 
                                                                   ≤0.1 % 
ICP:                                                            Confirms Na and S Components Confirmed
痕量金属分析total metallic impurities   ≤100ppm by ICP Atomic emission AND AAS
(Al、Ba、B、Ca、Cr、Fe、Li、K、Ru、Cs) 
 

项目Item                                                     分析纯        化学纯
                                                                         (AR)          (CP)
含量(Na2S·9H2O)Assay,%                 ≥98.0          96.0
澄清度试验Clarty                                          合格         合格
水不溶物Insiluble matter in water,%     ≤0.002         0.005
铵盐(NH4)Ammonium,%                       ≤0.002         0.006
碘氧化物(以Na2S2O3.5H2O) 
Substances oxided by lodine,%           ≤0.5           0.1

ACS级
项目名称　                                                                      ACS Grade
含量Assay                                                                       ≥98.0%
铵Ammonium                                                                 ≤0.005% 
亚硫酸盐和硫代硫酸盐Sulfite and thiosulfate            ≤0.1%
 

第8类腐蚀品

用于制造染料、硫化物，并用作矿石浮选剂、生皮脱毛剂、纸张蒸煮剂等
密封阴凉处保存