How to identify the quality of gypsum board for ceiling?

Moisture-proof gypsum board is actually adding a certain amount of waterproof agent to gypsum core material, which will make gypsum itself have certain moisture-proof performance, which is difficult to distinguish visually. Suggest that the consumer send it to the relevant quality inspection department for testing. Decorative gypsum board with corresponding thickness. High-quality board is lighter than inferior board. This is because their production technology level is different.