性状  无色结晶,易受潮并逐渐分解，能溶于水、醇、丙三醇，不溶于醚。1g溶于约1ml水(17℃时，83g溶于100ml水)、19ml乙醇、8ml甲醇，溶于醇、甘油和丙二醇，不溶于冷醚。0.2mol/L水溶液pH为3.2。半数致死量(小鼠，经口)408mg/kg。有腐蚀性。
密度:1.67
熔点:155-157℃

质量标准  
GB/T 6685-86
项目Item                                   优级纯        分析纯   
                                            (GR)          (AR)     
含量(NH2OH.HCl)Assay,%                  ≥ 99.0          98.5     
水溶液反应Water solution reaction           合格          合格     
澄清度试验Clarity                           合格          合格     
灼烧残渣(以硫酸盐计)Ignition residue,%   ≥ 0.01           0.01     
硫酸盐(SO4)Sulfate,%                     ≥ 0.002          0.002   
铵盐(NH4) Ammonium,%                     ≥ 0.1            0.1     
铁(Fe)Iron,%                             ≥ 0.0003         0.0003   
砷(As)Arsenic,%                          ≥ 0.0005           --       
重金属(以Pb计)Heavy metals,%             ≥ 0.0003         0.0003   

ACS级
项目名称　                                       ACS Grade
含量(NH2OH·HCl)Assay                             ≥96.0%
乙醇溶解试验Solubility in alcohol                 Passes test
灼烧残渣Residue after ignition                    ≤0.05%
可滴定酸Titrable acid                             ≤0.25meq/g
铵（NH4）Ammonium                                  Passes test
硫酸盐
和亚硫酸盐(SO4)Sulfate and sulfite                ≤0.005%
铁(Fe)Iron(Fe)                                    ≤5ppm
重金属(以Pb计)Heavy metals(as Pb)                 ≤5ppm

99.99% metals basis:

外观Appearance                                   White Crystals
红外光谱Infrared spectrum                        Conforms to Structure
滴定纯度红外光谱鉴别Infrared spectrometry        Conforms to Structure
纯度Purity                                       ≥99.99% Based on Trace Metals Impurities
纯度Purity by Titration by KMNO4                 98.5 - 101.5 %
灼烧残渣Residue on Ignition                      ≤0.05 %
溶液澄清度Clarity of Solution                    Pass
铁Iron (Fe)                                      ≤5 ppm
重金属Heavy Metal (as Lead)                      ≤5 ppm
铵盐Ammonium                                     Pass
硫化物Sulfur compounds                           ≤0.005 %
可滴定酸Titratable acid                          ≤0.25 MEQ/g
痕量金属分析Trace Metal Analysis                 ≤100.0 ppm by ICP Atomic emission

贮存  阴凉干燥保存。
用途  无机分析还原剂，络合剂，电分析去极剂，脂肪酸和肥皂的抗氧剂，分析甲醛、樟脑和葡萄糖等，有机分析检验醛和酮类，微量分析磺酸，钢铁中镁成分测定，有机合成制备肟类。彩色影体洗印。催化剂。溶胀剂。共聚反应阻聚剂。
联合国编号  2923
Risk：  R22- R36/38- R43- R48/22- R55-
Safety :  S22- S24- S37- S61-