(1) Test according to GB / t8625-88, the average remaining length of each group of test pieces is ≥ 150mm (the remaining length of any test piece is > 0), and the average peak flue gas temperature of each test is ≤ 200 ℃;
(2) Tested according to GB / t8626-88, the flame tip height index is less than 150mm, and it is not allowed to ignite the filter paper by burning droplets;
(3) Tested according to GB / t8627-1999, the smoke density grade (SDR) ≤ 75
