Test method for barrier property of foam glass to external water vapor

Abstract: foam glass is commonly used thermal insulation material and wall material for building and industrial equipment Its use condition is worse than that of inner layer material Its moisture permeability directly affects the use effect and life span of building and industrial equipment In this paper, the Labthink blue light W3/030 vapor transmittance tester is used to test the barrier performance of foam glass to external water vapor The basic process of the test, the scope of application of the test equipment and the parameters of the equipment are introduced Key words: foam glass, water vapor transmission, moisture permeability, moisture resistance, water vapor barrier, weighing method, water vapor transmittance tester 1, significance Foam glass is a kind of porous inorganic non-metallic material, which is made of waste flat glass and bottle glass It has many characteristics, such as fire prevention, waterproof, non-toxic, corrosion resistant, moth proofing, no aging, no radioactivity, insulation, antimagnetic wave, antistatic, high mechanical strength, good adhesion with various kinds of mud It is often used for heat insulation, sound insulation and prevention of building exterior walls and roofs Water material Because foam glass is used as building materials for building external walls, it should have high moisture resistance If the moisture resistance of foam glass is poor, that is, the water vapor transmission rate is large, the moisture will extend into the inner wall through foam glass, resulting in problems of heat insulation performance degradation, wood decay, component strength reduction, moldy and so on Therefore, manufacturers should strengthen the detection of water vapor transmittance of foam glass, so as to verify the barrier performance of foam glass to external moisture 2 Test standard at present, the test methods of water vapor transmission in China are weighing method (cup method), electrolysis method, humidity method and infrared method The reference method standards are GB 1037-1988 test method of water vapor permeability of plastic film and sheet cup method, GB / T 16928-1997 test method of water vapor permeability of packaging materials, GB / T 21529-2008 determination of water vapor transmission of plastic film and sheet - Electrolytic sensor method, GB / T 30412-2013 determination of water vapor transmission of plastic film and sheet - humidity sensor method, etc The vapor transmission rate of foam glass is measured by weighing method The standard is GB 1037-1988 3, test samples of a brand of foam glass samples for external walls 4 Test equipment the test equipment used in this paper is Labthink blue light W3 / 030 water vapor transmittance tester 4.1 test principle W3 / 030 uses the test principle of the moisture cup weighing method to make the two sides of the sample form a specific humidity difference at a certain temperature The water vapor enters the dry side through the sample in the moisture cup By measuring the change of the weight of the moisture cup with time, the water vapor transmittance and other parameters of the sample are obtained 4.2 scope of application (1) this equipment is applicable to the water vapor transmission test of plastic film, sheet, paper, paperboard, textile, non-woven fabric and other packaging Film materials: suitable for testing the water vapor permeability of various plastic film, plastic composite film, paper plastic composite film, geomembrane, coextrusion film, waterproof and ventilating film, aluminized film, aluminum foil, aluminum foil composite film and other film materials Sheet materials: applicable to the water vapor transmission test of various engineering plastics, rubber, building materials (waterproof materials for construction), thermal insulation materials and other sheet materials For example, PP sheet, PVC sheet, PVDC sheet, nylon sheet, etc.; paper and paperboard are suitable for water vapor transmission test of paper and paperboard; textiles and non-woven fabrics are suitable for water vapor transmission test of textiles, non-woven fabrics and other materials It is also suitable for testing the vapor transmission rate of materials such as solar backplane, liquid crystal display screen, aseptic protective film, beauty mask, protective clothing and other materials (2) the equipment can meet a number of national and international standards, such as ISO 2528, GB 1037, GB / T 16928, ASTM e66, ASTM D1653, TAPPI t464, DIN 53122-1, JIS z0208, YBB 00092003 4.3 test range of equipment parameters: 0.1 ~ 10, 000 g / (M2 · 24 h); number of samples: 1-3; resolution: 0.001 g; test temperature range: 15 ℃ ~ 55 ℃, temperature control accuracy ± 0.1 ℃; test humidity range: 10% RH ~ 98% RH (standard 90% RH), temperature control accuracy ± 1% RH; support lystemtm laboratory data sharing system, and manage test results and test reports in a unified way 5 Test process (1) cut the sample into three 75 mm × 75 mm squares with a cutter (2) seal the sample on the moisture cup with wax, place the moisture cup in the test chamber, and close the glass sealing door (3) set the sample name, sample thickness, test temperature, test humidity and other parameters (4) start the air source and click the "start test" option (5) after the test, the instrument automatically calculates and displays the test results 6 Test results the test values of water vapor transmittance of the three samples were: 4.2405 g / (M2 · 24h), 4.3114 g / (M2 · 24h), 4.3075 g / (M2 · 24h) 7 Conclusion the W3/030 water vapor transmittance tester is a professional equipment for testing the barrier properties of thin film and sheet materials to external water vapor It has the advantages of high detection accuracy and good repeatability of test results, and can truly reflect the moisture resistance of foam glass Labthink Languang has been committed to providing professional testing services and equipment for customers around the world Over the years, it has provided tens of thousands of water vapor transmittance testing services for customers around the world, providing customers with reliable technical solutions To learn about the relevant testing equipment and testing services, you can log in Jinan Languang company or call for consultation The more you understand, the more you trust! Jinan Languang Electromechanical Technology Co., Ltd is willing to take this opportunity to enhance technical exchanges and cooperation with enterprises and institutions in the industry.