Model | 101 | 102 | 103 |
Filtration rate | Fast | Medium Speed | Slow |
Quantitative(g/m2) | 80士4 | 80士4 | 80士4 |
Water filtering time（s) | ≤35 | 35-70(inclusive) | 35-70(inclusive) |
Aperture(um) | 20-25 | 15-20 | 10--15 |
Ash content(<%) | 0.15 | 0.15 | 0.15 |
Instructions:
1. Fold the filter test paper in half twice in a row to form a 90° central angle shape.
2. Put the folded filter paper into three layers on one side and open one layer on the other side to form a funnel shape.
3. Put the funnel-shaped filter paper into the funnel. The edge of the filter paper should be lower than the edge of the funnel. Pour some water into the funnel so that the soaked filter paper is close to the inside of the funnel. Then pour out the remaining water and set aside for use.
4. Place the funnel with the filter paper on the filter funnel stand (such as the ring on the iron stand). Place the beaker or test tube under the funnel neck to receive the filter, and place the tip of the funnel neck against the wall of the receiving container.
5. When injecting liquid that needs to be filtered into the funnel, hold the liquid beaker in your right hand and the glass rod in your left hand. Place the lower end of the glass rod on the lower side of the glass rod, so that the mouth of the cup is close to the glass rod. The liquid to be filtered flows out along the mouth of the cup, and then along the The glass rod tilts and flows into the funnel. Note: the liquid level flowing into the funnel cannot exceed the height of the filter paper in the funnel.
6. When the liquid passes through the filter paper and flows down the neck of the funnel, check whether the liquid flows down the wall of the cup and into Betty. Otherwise, the beaker should be moved or the funnel should be rotated to make the tip of the funnel and the beaker iron firm. The liquid flowed down the wall of the cup.
