1. Determination the weight of filter paper by drying in hot air oven (105o
C) for 1 h, then
cool in desiccators and record the weight. Store in the desiccators until use.
2. Determination the weight of crucible by heating in furnace (500o
C) for 2 h, then cool
in desiccators and record the weight. Store in the desiccators until use.
3. Weight the sample (2-5 g) (defat before determining fiber) in a 500 ml beaker or Duran
bottle.
4. Add 200 ml of 1.25% sulfuric acid and then boil in the hot plate or water baht for 30
min. Cover the beaker with foil or loose cap duran bottle.