| item |
index |
||
| superior grade |
a grade |
qualified |
|
| appearance |
clear and transparent, free of mechanical impurities and free water |
||
| purity/% ≥ |
99.7 |
99.5 |
99.3 |
| polymer，mg/kg ≤ |
10 |
10 |
50 |
| peroxide (in hydrogen peroxide)，mg/kg ≤ |
100 |
||
| total aldehyde (benzaldehyde)， % ≤ |
0.01 |
0.02 |
0.02 |
| color, (platinum-cobalt) ≤ |
10 |
15 |
30 |
| the polymerization retarder（tbc）, mg/kg |
10 ~ 15 |
||
packaging, transportation and storage:
styrene shall be loaded into a dry, clean special tank wagon or galvanized steel drum with appropriate amount of antipolymerization agent (p-tert-butylo-phenol). the net weight of styrene in barrel is 160kg. the barrel mouth should be closed to prevent the infiltration of styrene and water. this product should be stored under 25 ℃ or refrigerated warehouse, in order to prevent the aggregation metamorphism. during transportation, rain and sun exposure should be prevented.