Gravimetric analysis Method using PVC filter dust filters to find the weight of dust. Use a vacuum pump sucking air rate at 2.0 liters per minute for 8 hours.
Analysis Gravimetric Method using a filter PVC dust filter, then the weight of the dust. The absorption rate of the pump exhaust 2.0 liters per minute for eight hours.
The Gravimetric Method using filter PVC as filter dust and leads to the weight of the dust. The rate of air suction at the suction pump 2.0 liters per minute for 8 hours.