建筑用油毡按标准规定需要做透水性试验。现行标准中规定采用动水压法,如350号石油沥青毡在1公斤/厘米~2水压下保持半小时以上不透水,算为合格。但过去由于没有透水试验器,不能测定不透水性指标。去年,我室制作了一个简易不透水性试验器, Building linoleum needs to be tested for water permeability according to the standards. The current standard stipulates the use of a hydrodynamic pressure method. For example, the No. 350 petroleum bitumen felt should be kept for more than half an hour under water pressure of 1 kg/cm~2, impervious to water, and counted as qualified. However, in the past, because there was no permeability tester, the impermeability index could not be measured. Last year, our chamber produced a simple impermeability tester.