There are so many things like Nacl, carbomer , HPMC, guar gum, xanthem gum and many more. Now I want to understand the difference between viscosity that is produced by different things. As I know all the products produced viscosity is not similar, some may be inferior and some may be superior, some may long last and some heat sensitive and vice versa. Now I want to get a better understanding about this, if you have time to share your experience and knowledge . So what you prefer the products for achieving the viscosity and why??