GB/T 7991.7-2019 English PDFUS$199.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 7991.7-2019: Test method of vitreous and porcelain enamels -- Part 7: Determination of coefficient of mean linear thermal expansion Status: Valid
Basic dataStandard ID: GB/T 7991.7-2019 (GB/T7991.7-2019)Description (Translated English): Test method of vitreous and porcelain enamels -- Part 7: Determination of coefficient of mean linear thermal expansion Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: G94 Classification of International Standard: 71.120; 25.220.50 Word Count Estimation: 10,122 Date of Issue: 2019-12-10 Date of Implementation: 2020-11-01 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 7991.7-2019: Test method of vitreous and porcelain enamels -- Part 7: Determination of coefficient of mean linear thermal expansion---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. Test method of viterous and porcelain enamels--Part 7. Determination of coefficient of mean lincar thermal expansion ICS 71.120; 25.220.50 G94 National Standards of People's Republic of China Replaces GB/T 25144-2010 Test method for glass lined layer Part 7. Determination of mean linear thermal expansion coefficient Part 7. Determinationofcoefficientofmeanlincarthermalexpansion 2019-12-10 release 2020-11-01 implementation State Administration of Market Supervision Published by the National Standardization Management Committee ForewordGB/T 7991 "Test method for glass lined layer" is divided into 10 parts. --- Part 1. Determination of corrosion resistance of alkaline solutions; --- Part 2. Determination of resistance to boiling acids and their vapor corrosion; --- Part 3. Determination of resistance to sudden changes in temperature difference; --- Part 4. Determination of mechanical shock resistance; --- Part 5. thickness measurement by electromagnetic method; --- Part 6. High voltage test; --- Part 7. Determination of the average linear thermal expansion coefficient; --- Part 8. Determination of scratch resistance; --- Part 9. Determination of tensile strength; --- Part 10. Determination of lead and cadmium dissolution. This part is Part 7 of GB/T 7991. This section is drafted in accordance with the rules given in GB/T 1.1-2009. This section replaces GB/T 25144-2010 "Determination of the average linear thermal expansion coefficient of glass-lined glaze", which is in line with GB/T 25144-2010 Compared with the editorial changes, the main technical changes are as follows. --- Added Chapter 4 Principles (see Chapter 4); --- Modified "Push rod expander should be able to measure 2 × 10-3L0 change" to "Push rod expander should be able to measure 2 × 10-6L0 The amount of change "(see 6.2, 4.2 of the.2010 edition); --- "The axial or radial movement of the dilatometer in the heating furnace by 2mm should not affect the measurement accuracy" was modified to "the dilatometer is in the heating furnace Axial or radial movement of 0.5mm shall not affect the measurement accuracy "(see 6.3.1, 4.3 of the.2010 edition); --- Added "Before the sample is fired, the glass-lined glaze should be dried at (110 ± 5) ℃, the drying time should be not less than 5h" and "Fired The rear sample must be free from defects such as cracks, bubbles, partial shedding, and abrasion "(see 7.2); --- Added the requirement of "sample size. length (45mm ~ 50mm) ± 0.5mm, cross-section diameter ϕ 10mm ± 0.5mm" (See 7.4); --- Increased the provision of test temperature range selection (see Chapter 8). This section is proposed by the China Petroleum and Chemical Industry Federation. This section is under the jurisdiction of the National Glass-lined Equipment Standardization Technical Committee (SAC/TC72). This section was drafted by. Jiangyin Dacheng Chemical Equipment Factory, Jiangsu Yangyang Chemical Equipment Manufacturing Co., Ltd., Taicang New Industry Glass Lined Co., Ltd. Company, Suzhou Xieli Chemical Equipment Co., Ltd., Jiangyin Sipu Enamel Co., Ltd., Tianhua Chemical Machinery and Automation Research and Design Institute Ltd. The main drafters of this section. Lu Wujun, Zhu Hongzhi, Su Tingting, Shen Yongqi, Qian Jianfeng, Yu Xianzhong, Sang Linchun, Xiao Lijuan. The previous versions of the standards replaced by this section are. --- GB/T 25144-2010. Test method for glass lined layer Part 7. Determination of mean linear thermal expansion coefficient1 ScopeGB/T 7991 specifies the method for determining the average linear thermal expansion coefficient of glass-lined glazes below the transition temperature. This section applies to the determination of the average linear thermal expansion coefficient of glass-lined glaze.2 Normative referencesThe following documents are essential for the application of this document. For dated references, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. GB/T 21389 Vernier, Band Watch and Digital Caliper3 terms and definitionsThe following terms and definitions apply to this document. 3.1 Coefficientofmeanlinearthermalexpansion α (t0; t) At a test temperature, the ratio of the length change of the sample to the temperature change and the initial length of the sample. Expressed by equation (1). α (t0; t) = L0 × L-L0 t-t0 (1) Where. t0 --- reference temperature or initial temperature (the reference temperature t0 defined in this section is 20 ° C), the unit is degrees Celsius (° C); t --- sample test temperature in degrees Celsius (° C); L0 --- length of sample at temperature t0, unit is millimeter (mm); L --- the length of the sample at temperature t, the unit is millimeter (mm). 3.2 Transformation temperature The temperature at which the glass-lined glaze changes from a brittle state to a viscous state.4 PrincipleWithin the test temperature range, heat or cool the sample to the test temperature at a certain heating rate and cooling rate, and measure the length of the sample The degree of change in temperature is recorded at the same time, and the linear thermal expansion coefficient of the sample is calculated based on the recorded data.5 Factors affecting measurement accuracy5.1 The materials used to make the dilatometer will have a greater impact on the test accuracy.Therefore, when selecting the dilatometer material, the expansion performance of the material should be determined ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 7991.7-2019_English be delivered?Answer: Upon your order, we will start to translate GB/T 7991.7-2019_English as soon as possible, and keep you informed of the progress. 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