MOISTURE CONTENT

This method covers the procedure for the determination of moisture content in pigments and extenders and is applicable for samples which do not decompose below 110deg.C..

APPARATUS AND REAGENTS :

1. Glass petri-dish : Approx. dia 70-80 mm ht. 20-30
2. Oven.
3. Analytical balance.
4. Desiccator.

PROCEDURE :

1. Weigh the clean and dry glass petri dish.

2. Add about 5gms of the test sample accurately weighed to the nearest mgs in the dish. The should be spread uniformly in the dish.

3. Keep the dish in the oven maintained at 105 deg.C. to 110 deg.C. for 1 hour.

4. Remove the dish from the oven and cool it in a desiccator.

5. Reweigh the dish with the sample.

6. Test to be done in duplicate.

CALCULATION :

A = Wt. of the petri-dish.
B = Wt. of petri-dish and sample before drying.
C = Wt. of petri-dish and sample after drying.
B-A = Wt. of sample before drying.
C-A = Wt. of sample after drying.