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GB/T 4121-2014 English PDF

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GB/T 4121-2014: Test method for stability to thermal darkening of quartz glass
Status: Valid

GB/T 4121: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 4121-2014English149 Add to Cart 2 days [Need to translate] Test method for stability to thermal darkening of quartz glass Valid GB/T 4121-2014
GB/T 4121-1983English199 Add to Cart 2 days [Need to translate] The test method for stability to thermal darkening of silica glass Obsolete GB/T 4121-1983

PDF similar to GB/T 4121-2014


Standard similar to GB/T 4121-2014

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Basic data

Standard ID GB/T 4121-2014 (GB/T4121-2014)
Description (Translated English) Test method for stability to thermal darkening of quartz glass
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard Q35
Classification of International Standard 81.040
Word Count Estimation 5,522
Date of Issue 7/24/2014
Date of Implementation 3/1/2015
Older Standard (superseded by this standard) GB/T 4121-1983
Regulation (derived from) National Standards Bulletin No. 19, 2014
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary This Standard specifies the principles of quartz glass thermal discoloration test, instruments and materials, sample requirements, test procedures and test report results presentation. This Standard applies to thermal discoloration test transparent quartz

GB/T 4121-2014: Test method for stability to thermal darkening of quartz glass

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Test method for stability to thermal darkening of quartz glass ICS 81.040 Q35 National Standards of People's Republic of China Replacing GB/T 4121-1983 Quartz glass thermal discoloration test method Issued on. 2014-07-24 2015-03-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard was drafted in accordance with GB/T 1.1-2009 given rules. This standard replaces GB/T 4121-1983 "Test method for thermal discoloration quartz glass." This standard compared with GB/T 4121-1983 The main changes are as follows. --- With "transmittance" instead of the original "transmission"; --- Modify the high-temperature furnace, spectrophotometer requirements (see 31, 33, 1983 version 3.1, 3.3.); --- Modify the sample requirements (see Chapter 4, 1983 edition 2.3); --- Refine the test procedure (see Chapter 5, Chapter 4, Chapter 5 of the 1983 edition); --- Remove a predetermined value the heat treatment temperature and time (see 56, 57, 1983 edition of 4.2,5.3.); --- Modify the presentation of the results (see 61, 1983, version 6.1.); --- Modify the test report shall include at least the contents (see Chapter 7, 1983 edition, Chapter 7). The standard proposed by China Building Materials Federation. The industry standard by the National Standardization Technical Committee special glass and glass (SAC/TC447) centralized. This standard was drafted. China Building Materials Certification & Inspection Group Co., Ltd., the national security glass and quartz glass Quality Supervision and Inspection Heart, China Building Materials Academy. The main drafters of this standard. Wu Jie, Wangjing Xia, Yang will, Yang Xuedong, Zhang Hao Yun, Zheng Liying. This standard replaces the standards previously issued as follows. --- GB/T 4121-1983. Quartz glass thermal discoloration test method

1 Scope

This standard specifies the principles of the quartz glass thermal discoloration test, instruments and materials, sample requirements, test procedures and test results are expressed report. This standard applies to thermal discoloration test transparent quartz glass and other transparent quartz products. Principle 2 Transparent quartz glass after heat treatment, the change of light transmittance occur. Characterization of thermal discoloration transmission ratio change value with 290nm wavelength.

3 Apparatus and materials

3.1 high-temperature furnace. temperature not lower than 1300 ℃, furnace temperature accuracy of 1 ℃, temperature fluctuation is less than or equal to 5 ℃. 3.2 Electric oven. temperature not lower than 110 ℃. 3.3 Spectrophotometer. wavelength range comprising 200nm ~ 380nm, the transmittance measurement accuracy is not less than 0.1%. 3.4 Sample case. made of transparent quartz glass, with cover. 3.5 vernier caliper. accuracy no less than 0.02mm. 3.6 ethanol. AR. 3.7 Deionized water. Conductivity (25 ℃) not more than 0.50mS/m. 3.8 chrome crucible tongs and clamps Teflon. 3.9 glass beaker.

4 sample request

4.1 3 samples of the same batch transparent. 4.2 The shape and size should be in accordance with Table 1. Table 1 Sample Type Sample shapes and sizes 6mm ~ 40mm diameter quartz glass tube Cut height of 30mm ~ 40mm of pipe sections, and cut in half in the axial direction, take half of them sample More than 40mm diameter quartz glass tube is cut height of 30mm ~ 40mm pipe, 25mm chord length of the sample Other products Cut 35mm × 25mm × s sample, s an article of the original thickness; thickness greater than 5mm when the article When a thickness of about 5mm cut the sample, the test surface shall be mechanically polished 4.3 Sample test surface shall not be colored thread, crystal pattern, obviously grooves and ridges or a width greater than 1mm gas lines, air bubbles, scratches, etc. affect the transmission ratio detection Defects. Mechanical polishing test surface should be smooth and transparent, no pitting, no scratches.

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