The evaluation of the physical properties of sheet is affected by humidity. Therefore, measurements are performed in a constant temperature and humidity room so that evaluations can be performed under a constant atmosphere. In addition, tests need to be performed under consistent conditions, so a constant temperature and humidity bath are used.
Constant temperature and humidity room
Physical properties of sheets, such as strength, may vary from changes in temperature and humidity. Therefore, they are measured in a room with a constant temperature and humidity. The environment of this room is always controlled at a temperature of 23°C and humidity of 50% as specified by JIS.
Constant temperature and humidity bath
This bath is used when tests need to be performed under constant conditions. For example, the constant temperature and humidity bath is used for the measurement of tensile and peeling strength of a sheet under severe conditions, such as a temperature of 80°C and humidity of 80%.
Constant temperature bath
This bath is used when tests need to be performed under constant temperature conditions. This bath measures durability over time under low to high temperatures (-40°C to 100°C).