Pipes with Schedule 40 come with a standard weight, and pipes with Schedule 80 come with extra strength.
Schedule 80 pipes are stronger than Schedule 40 pipes.
Though both pipes are used in construction work, Schedule 40 is used more often.
Schedule 80 pipes are used where the pipes have to be exposed. But if there is no need for any extra strength, Schedule 40 pipes are sufficient.
When comparing the weight, Schedule 40 pipes come in less weight than Schedule 80 pipes.
As Schedule 80 pipes consist of more materials, the price is considerably higher than Schedule 40 pipes.
If there is a need for a high water temperature or high-pressure pipe, Schedule 80 is the best as it can withstand a greater pressure and temperature than Schedule 40 pipe