... Sodium hydroxide (NaOH), also known as lye and caustic soda, is a caustic metallic base. It is used in many industries, ... and sales base and external processing of flake caustic, solid caustic soda, granular caustic soda, which provide ideal condition and environment for domestic ... soft drink bottles, in food and drug industry ,it is used as acidity regulator, alkali, and so on.1 Caustic soda