NF T34-721-3-2008 Paints and varnishes - Coating materials and coating systems for exterior masonry and concrete - Part 3 determination of liquid water permeability 《涂料和清漆 外部砖石和混凝.pdf

1、NF EN 1062-3mai 2008Ce document est usage exclusif et non collectif des clients Saga Web.Toute mise en rseau, reproduction et rediffusion, sous quelque forme que ce soit,mme partielle, sont strictement interdites.This document is intended for the exclusive and non collective use of Saga Web customer

2、s.All network exploitation, reproduction and re-dissemination,even partial, whatever the form (hardcopy or other media), is strictly prohibited.Saga Web Pour SHANGHAI INTERNAT SCIENCE 24 h drying at (50 2) C. If the coatings are thermoplastic at 50 C, the test specimens shall be suspended and/or sui

3、tably placed in the oven, ensuring that they do not adhere to the parts of the oven and/or to each other. During weekends, or interruption for other reasons, store the test specimens in the standard atmosphere as defined in EN 23270 (23 2) C and (50 5) % relative humidity. After the last cycle store

4、 the test specimens at (50 2) C for at least 24 h. Afterwards, condition the test specimens in the standard atmosphere as defined in EN 23270 (23 2) C and (50 5) % relative humidity for at least 24 h before carrying out the test. 7 Procedure Carry out the determination at (23 2) C, unless otherwise

5、agreed. Weigh the test specimen to the nearest 0,1 g. Fill the container with deionized water or fresh tap water (potable water) and allow the temperature of the water to attain (23 2) C. Support the test specimen on a plastics or metal rack with the maximum possible area of the coated surface under

6、 test facing downwards so that this face is 5 mm to 10 mm below the surface of the water and also at least 10 mm above the base of the container. Ensure full wetting of the surface, i.e. removal of air bubbles by careful wiping with a clean damp lint free cloth or tissue 10 min after the start of th

7、e test. After 24 h remove the test specimen from the water, carefully wipe it dry using absorbent paper, and weigh the test specimen to the nearest 0,1 g. NOTE Depending on the time the slope of the curve of water absorption can provide important information about the hygric behaviour of coatings. T

8、herefore, it is recommended to measure the water absorption after 10 min, 30 min, 1 h, 2 h, 3 h, 6 h and 24 h. 8 Expression of results The water transmissibility w, in kilograms per square metres per square root of hours, is determined by the mass increase (in kilograms) divided by the area of the t

9、est specimens (in square metres) and by the square root of time (24 h)0,5. The area shall be the area of the testing surface not covered by the overlapping sealing coating (see 6.3). For the classification according to EN 1062-1 the arithmetic mean value from at least three individual measurements s

10、hall be used. 9 Precision 9.1 RepeatabilityThe value below which the absolute difference between two single test results, each the mean of triplicates, obtained on identical material by one operator in one laboratory within a short interval of time using the EN 1062-3:2008 (E) 8standardized test met

11、hod, can be expected to lie with a 95 % probability, is 10 % (relative to the mean of the two test results). 9.2 ReproducibilityThe value below which the absolute difference between two single test results, each the mean of triplicates, obtained on identical material by operators in different labora

12、tories using the standardized test method, can be expected to lie with a 95 % probability, is 15 % (relative to the mean of the two test results). 10 Test report The test report shall contain at least the following information: a) reference to this document (EN 1062-3:2008); b) all details necessary

13、 to identify the product tested; c) number of test specimens (replicates); d) type of coating system, method of application, applied mass, number of coats, drying time; e) nature of the substrate and dimensions of the test specimens; f) results of the test, as indicated in clause 8 (individual and mean values and classification according to EN 1062-1); g) particular observations; h) any deviation from the test method specified; i) date of the test.