To evaluate a material, the difference between ambient temperature and that in the chimney is recorded continuously using thermocouples and compared with a calibration curve derived in a similar manner using asbestos cement board of a specific density. The two curves are evaluated by establishing the temperatures from the calibration curve and test curve at 30 s intervals from the start of the test to 3 min, at 1 min intervals from 4 to 10 min and at 2 min intervals from 12 to 20 min.

基于1个网页-相关网页