Abstract: Foam glass is a commonly used insulation material and wall material for construction and industrial equipment. Its environmental conditions are harsher than those of inner materials. Its moisture permeability directly affects the use and life of buildings and industrial equipment. In this paper, Labthink blue light W3/030 water vapor transmission rate tester is used to test the barrier performance of foam glass to external water vapor, and the basic process of the test and the applicable scope and equipment parameters of the test equipment are introduced. The company chooses the moisture permeability. Test equipment and test methods can be referred to.

Key words: foam glass, water vapor transmission rate, moisture permeability, moisture resistance, water vapor barrier property, weighing method, water vapor transmission rate tester

1 , meaning

Foam glass is a porous inorganic non-metallic material which is made of waste flat glass and bottle glass and is foamed at high temperature. It is fireproof, waterproof, non-toxic, corrosion-resistant, anti-mite, non-aging, non-radioactive and insulating. Anti-magnetic wave, anti-static, high mechanical strength, good adhesion to various types of mud, commonly used in building exterior wall and roof insulation, sound insulation, waterproof materials. Because foam glass is a packaging material used for building exterior walls, it should have high moisture resistance. If the foam glass has poor moisture resistance, that is, the water vapor transmission rate is large, moisture will penetrate through the foam glass. The wall layer causes problems such as decreased thermal insulation performance, wood decay, component strength reduction, and mildew. Therefore, manufacturers should strengthen the detection of water vapor transmission rate of foam glass to verify the barrier properties of foam glass to external moisture.

2 , test standards

At present, the domestic test methods for water vapor transmission rate include weighing method (cup method), electrolysis method, humidity method and infrared method. The method standard that can be referred to is GB 1037-1988 "Plastic film and sheet water vapor permeability. Test Method Cup Method, GB/T 16928-1997 "Test Method for Permeability of Packaging Materials", GB/T 21529-2008 "Determination of Water Vapor Transmission Rate of Plastic Films and Sheets - Electrolytic Sensor Method", GB/ T 30412-2013 "Humidity film and sheet water vapor transmission rate measurement humidity sensor method" and the like. In this paper, the water vapor transmission rate of foam glass is tested by weighing method, and the standard is GB 1037-1988.

3 , test samples

A sample of foam glass for a brand's exterior wall.

4 , test equipment

The test equipment used in this paper is the Labthink W3/030 water vapor transmission rate tester.

4.1 Test principle

W3/030 adopts the principle of wetting cup weighing method. Under certain temperature, the specific humidity difference is formed on both sides of the sample. The water vapor passes through the sample in the moisture permeable cup and enters the dry side. The amount of change in the weight of the moisture permeable cup over time is determined by parameters such as the water vapor transmission rate of the sample.

4.2 Scope of application

(1) This equipment is suitable for water vapor transmission rate test of plastic film, sheet, paper, cardboard and its textiles, non-woven fabrics and so on.

Film material: water vapor transmission rate of film materials such as plastic film, plastic composite film, paper-plastic composite film, geomembrane, co-extruded film, waterproof breathable film, aluminized film, aluminum foil, aluminum foil composite film, etc. test;

Sheet type: It is suitable for water vapor transmission rate test of sheet materials such as engineering plastics, rubber, building materials (waterproof materials for construction) and insulation materials. Such as PP sheet, PVC sheet, PVDC sheet, nylon sheet, etc.;

Paper and paperboard are suitable for water vapor transmission rate test of paper and paperboard;

Textiles and non-woven fabrics are suitable for water vapor transmission rate testing of textiles, non-woven fabrics, etc.;

It is also suitable for water vapor transmission rate testing of materials such as solar backsheets, liquid crystal display films, sterile protective films, cosmetic masks, and protective clothing.

(2) This equipment can meet a number of national and international standards, such as ISO 2528, GB 1037, GB/T 16928, ASTM E96, ASTM D1653, TAPPI T464, DIN 53122-1, JIS Z0208, YBB 00092003.

4.3 Equipment parameters

Test range: 0.1 ~ 10,000 g / (m2 · 24h);

Number of samples: 1 ~ 3 pieces;

Resolution: 0.001 g;

Test temperature range: 15 °C ~ 55 °C, temperature control accuracy ± 0.1 °C;

Test humidity range: 10% RH ~ 98% RH (standard 90% RH), temperature control accuracy ± 1% RH;

Support LystemTM laboratory data sharing system to manage test results and test reports.

5 , the test process

(1) Cut the specimen into three 75 mm × 75 mm squares with a cutter.

(2) The sample is wrapped with wax on the moisture permeable cup, and the moisture permeable cup is placed in the test chamber to close the glass sealing door.

(3) Set the sample name, sample thickness, test temperature, test humidity and other parameters.

(4) Start the air supply and click the “Start Test” option.

(5) After the test is over, the instrument automatically calculates and displays the test results.

6 , test results

The water vapor transmission rate test values ​​of the three samples were: 4.2405 g/(m2·24h), 4.3114 g/(m2·24h), and 4.3075 g/(m2·24h), respectively.

7 , conclusion

W3/030 Water Vapor Transmission Rate Tester is a professional testing equipment for film and sheet materials to the external water vapor barrier performance. It has the advantages of high detection accuracy and good repeatability of test results. It can truly reflect the foam glass. Humidity resistance. Labthink has been committed to providing professional testing services and equipment to customers around the world. Over the years, it has provided tens of thousands of water vapor transmission rate testing services to customers around the world, providing customers with reliable technical solutions. To understand the relevant testing equipment and testing services, you can log in to Jinan Languang Company or call us. The more you understand, the more you trust! Jinan Languang Electromechanical Technology Co., Ltd. is willing to enhance technical exchanges and cooperation with enterprises and institutions in the industry.