5 detection methods for commonly used waterproof coating indicators!

How to judge the quality of waterproof paint, waterproof paint commonly used indicators, I believe that many decoration friends are very concerned about such a problem, Yuyuan Shenghong paint finishing some waterproof paint commonly used indicators testing methods, we learn it together!
1,
film thickness check
should use needle puncture method, every 100 square meters of thorns three points, with a ruler to measure its height, take its average, film thickness should be greater than 2 mm. Use a colored pen as a marker when piercing for patching.
2,
break elongation inspection
in waterproof construction, supervision personnel can go to the construction site will be stirred good material, divided into multiple brushes on the flat glass plate (glass plate should be waxed first), film thickness 1.2-1.5 mm, after 7 days, soaked in 1% alkaline water for 7 days, and then baked in an oven at 50 degrees C 2 degrees C for 24 hours, do dumbbell stretching experiments, requiring an extension hold rate of 80% (200% without treatment) . If the standard is not reached, it means that the proportion of emulsion in the construction is insufficient. (This method is limited to normal two-part coatings)
3
, water resistance inspection
the paint will be painted on the cement block many times, film thickness of 1.2-1.5 mm, placed for 7 days, soaked in 1% alkaline water for 7 days, not layered, not empty drum for qualified.
4
, permeable inspection
under certain conditions, the application of instrument testing, the method is to match the paint proportionally, divided into multiple brushes on the glass plate (glass plate waxing first), thickness of 1.5 mm, sit still for 7 days, and then put people in the oven 50 degrees C±2 degrees C baking 24 hours, after removal and placement for 3 hours, do not permeable experiment, non-permeable 0.3M. Keep it leak-free for 30 minutes to qualify. If the conditions are not available, you can use visual inspection waterproofing effect, the method is to paint the paint 4-6 times to non-wovens, after drying (about 24h) film thickness of 1.2-1.5 mm, to make a slow box shape hanging empty, but not left a dead end, and then 1% alkali water plus people box, 24h no leakage as qualified.
5
, low gentleness check
waxing on the glass plate, the construction site stirred good paint is repeatedly painted on the glass plate, film thickness of 1.2-1.5 mm, after drying off the glass plate, placed indoor (25 degrees C±2 7 days, then cut off the length of 120-150 mm, width of 20 mm bar, the refrigerator temperature to -25 degrees C, put the test film in the refrigerator for 30 minutes, with a diameter of 10 mm round rod is wrapped in reverse once, no cracks for qualified. Cracks indicate that the emulsion is low and gentle enough.