aluminum sulfate
aluminum sulfate octadecahydrate
molecular formula: al2(so4)3·18h2o
molecular weight: 666.40
[character] white crystalline or crystalline powder. the relative density of 1.69,86.5℃ partial crystallization water loss. it decomposes at about 600℃ to form trioxide. soluble in water, insoluble in alcohol. aqueous solutions are acidic.
[to use] used to analyze reagents. also used as mordant, waterproofing agent, grease decolorizing agent and used in leather, paper, pharmaceutical industry.
[standard]the impurity content is calculated by the highest content
specification
name of index
|
analytically pure-ar
|
chemically pure-cp
|
content [al2(so4)3·18h2o] /%
|
≥99.0
|
≥99.0
|
clarity test
|
qualified
|
qualified
|
aqueous reaction
|
qualified
|
qualified
|
water insolubles
|
≤0.02
|
≤0.05
|
chloride(cl)
|
≤0.002
|
≤0.01
|
ammonium salt(nh4)
|
≤0.005
|
≤0.02
|
ferrum (fe)
|
≤0.003
|
≤0.01
|
heavy metal(pb)
|
≤0.001
|
≤0.002
|
alkali and alkaline earth metals
(as sulfate)
|
≤0.25
|
≤0.5
|
[packing] plastic inside and outside woven, kraft paper bag or cardboard bucket, net weight 25kg.
|