性 狀：    分輕質(zhì)和重質(zhì)兩種。輕質(zhì)體積蓬松，為白色無定形粉末。無嗅無味無毒。難溶于純水及有機(jī)溶劑，在水中溶解度因二氧化碳的存在而增大。能溶于酸、銨鹽溶液。經(jīng)高溫灼燒轉(zhuǎn)化為結(jié)晶體。遇空氣中的二氧化碳生成碳酸鎂復(fù)鹽。重質(zhì)體積緊密，為白色或米黃色粉末。與水易化合，露置空氣中易吸收水分和二氧化碳。與氯化鎂溶液混合易膠凝硬化。
密度：3．58
熔點(diǎn)：2852℃
沸點(diǎn)：3600℃

質(zhì)量標(biāo)準(zhǔn)：
GB/T 9857-88
項(xiàng)目Item                        分析純     化學(xué)純
(AR)       (CP)
含量(MgO)Assay,%                     ≥ 98.0        97.0
澄清度試驗(yàn)Clarity                      合格        合格
鹽酸不溶物Insoluble matter           ≤ 0.01        0.05
in hydrochlorie acid,%
水溶物Soluble matter,%               ≤ 0.5          --
灼燒失重Ignition loss,%              ≤ 2.0         3.0
氯化物(Cl)Chloride,%                 ≤ 0.01        0.03
硫酸鹽(SO4)Sulfate,%                 ≤ 0.02        0.1
磷酸鹽(PO4)Phosphate,%               ≤ 0.003       0.01
總氮量(N)Total nitrogen,%            ≤ 0.001       0.003
碳酸鹽(以CO2計(jì))Carbonate,%           ≤ 1.5          --
鈉(Na)Sodium,%                       ≤ 0.05        0.1
鉀(K)Potassium,%                    ≤ 0.005       0.01
鈣(Ca)Calcium,%                      ≤ 0.02        0.1
鐵(Fe)Iron,%                         ≤ 0.005       0.01
銅(Cu)Copper,%                       ≤ 0.001       --
鋅(Zn)Zinc,%                         ≤ 0.005       0.01
砷(As)Arsenic,%                      ≤ 0.0001      --
鋇和鍶(以Ba計(jì))Barium and strontium,% ≤ 0.005       0.01
重金屬(以Pb計(jì))Heavy metals,%         ≤ 0.003       0.01

高純氧化鎂粉（99.99%）：

純度Purity                              ≥99.99%
不純物含量(ug/g）：
Ca                                      ≤10
Fe                                      ≤10
Na                                      ≤5
Si                                      ≤15
B                                       ≤5
K                                       ≤0.5
Al                                      ≤10
S                                       ≤5
Clˉ                                    ≤150
粒徑                                    40μm
比表面積                                0.759 m2/g
煅燒溫度                                950℃

晶體氧化鎂：

晶體結(jié)構(gòu)Physical form ：                立方體 a=4.216埃（cubic a = 4.216 ?)
生長方法：                              電弧熔融法
熔    點(diǎn)mp:                             2852℃
晶體純度assay(MgO)                      >99.95%
晶體解理面：
尺寸size                                10 mm × 10 mm × 0.5 mm
密度Density：                           3.58g/cm3
介電常數(shù)dielectric constant:            9.8
熱膨脹系數(shù)Thermal expansion:            12.8×10 -6/℃
光透過率transmittance:                  200-400 nm, >90%
500-1000 nm, >98%
總雜質(zhì)total impurities：
C                                       <10 ppm
Cr                                      <10 ppm
Si                                      <10 ppm
Al                                      <15 ppm
Ca