|
Test Item
|
specification
|
Inspectionresult
|
||
|
High-Class |
first-class |
qualified
|
||
|
Appearance
|
Colorless transparent liquid
|
|||
|
DMF w /%
|
99.9
|
99.5
|
99.98
|
|
|
methyl alcohol w /%
|
0.001
|
0.003
|
0.005
|
0.0002
|
|
heavier component as DMAC w /% |
~
|
0.0057
|
||
|
Specific gravity 20'ºC,100kPa g / mL |
~
|
0.944
|
||
|
Color Pt-Co chrominance≤ |
5
|
10
|
20
|
<5
|
|
Reflective index (25ºC) |
~
|
1.4305
|
||
|
Fe w /%≤
|
0.05
|
0.0082
|
||
|
Mass content of water w /%
|
0.05
|
0.009
|
||
|
()≤
Acidity as formic acid % |
0.001
|
0.002
|
0.003
|
0.0008
|
|
()≤
Alkalinityas dimethylamine % |
0.001
|
0.002
|
0.003
|
0.0004
|
|
PH
PH:25ºC20% Aqueous solution |
6.5~8.0
|
7.15
|
||
|
ElectricConductivity≤ :
25°ºC20% Aqueous solution ,μs/ cm |
2
|
~
|
0.29
|
|
|
Conclusion
|
High - Class
|
|||