Hydroxypropyl methylcellulose HPMC ash detection method

Hydroxypropyl methylcellulose HPMC ash detection method:

1. Put 1.0-2.0g of hydroxypropyl methylcellulose test sample or the weight specified under each variety into the lump that has been ignited to constant weight and weigh it accurately.

2. During the test, place the cochlea on the electric furnace and ignite it slowly. Pay attention to avoid combustion until it is completely carbonized and does not emit thick smoke (when heating the test article that is easy to foam, it shall prevent overflow of the cochlea). Cool it to room temperature, ignite it at 700 ~ 800 ° C to completely ashing it, move it into the dryer, cool it to room temperature, finely weigh it, and then ignite it at 700-800 ° C to constant weight, which is calculated according to the ash weight.

3. Determination results and report

Calculate the percentage content of ash, residue and lump weight - air increased weight of ash 2x100% of the weight of the test sample according to the following formula.

For more information about hydroxypropyl methylcellulose products, please continue to pay attention to Shandong chuangyao Biotechnology Co., Ltd.