| method | dissolution time/min | determination of dissolution time by viscosity method/min | characteristic |
| dissolution time method | 65 | 50 | Large error and time consuming |
| solution viscosity method | 50 | 50 | It’s viscosity method in itself, so it’s time-consuming to measure the precise experiment |
| conductivity method | 30 | 55 | Large error and time consuming |
| insolubles filtration | 65 | 60 | Small error and time consuming |
| drop ball method | 70 | 65 | Simple operation and small error |