GB/T 12442-2019 English PDF

US$199.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 12442-2019: Test method for the hydroxyl groups content of silica glass
Status: Valid

GB/T 12442: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 12442-2019	199	Add to Cart	3 days	Test method for the hydroxyl groups content of silica glass	Valid
GB/T 12442-1990	159	Add to Cart	2 days	Test method for the hydroxyl groups content of silica glass	Obsolete

Similar standards

GB/T 42800   GB/T 32661   GB/T 30985   GB/T 45826   GB/T 45823   

Basic data

Standard ID: GB/T 12442-2019 (GB/T12442-2019)
Description (Translated English): Test method for the hydroxyl groups content of silica glass
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: Q35
Classification of International Standard: 81.040
Word Count Estimation: 10,148
Date of Issue: 2019-08-30
Date of Implementation: 2020-07-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 12442-2019: Test method for the hydroxyl groups content of silica glass

---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 for the hydroxyl groups content of silica glass ICS 81.040 Q35 National Standards of People's Republic of China Replace GB/T 12442-1990 Method for testing hydroxyl content in quartz glass Published on.2019-08-30 2020-07-01 implementation State market supervision and administration China National Standardization Administration issued

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 12442-1990 "Test method for hydroxyl content in quartz glass". Compared with GB/T 12442-1990, except The main technical changes outside the editorial changes are as follows. --- Revised the requirements for test equipment (see 5.1, 5.1 of the.1990 edition); --- Removed the requirement of "electronic AC voltage regulator with ±0.5% stability accuracy" (see 5.2 of.1990 edition); --- Revised the requirements for fixed diaphragms (see 5.3, 5.4 of.1990 edition); --- Added Method B (see 8.2); --- Revised the contents of Appendix A (see Appendix A, Appendix A of the.1990 edition); --- Increased precision requirements (see 8.4). This standard was proposed by the China Building Materials Federation. This standard is under the jurisdiction of the National Industrial Glass and Special Glass Standardization Technical Committee (SAC/TC447). This standard was drafted. China Building Materials Inspection and Certification Group Co., Ltd., China Building Materials Science Research Institute Co., Ltd., China Tian Technology Precision Materials Co., Ltd., Hubei Feilihua Quartz Glass Co., Ltd., China Building Materials Quzhou Jingran Quartz Co., Ltd. The main drafters of this standard. Yang Xuedong, Xiao Yuhua, Wu Hao, Ouyang Yuhua, Wu Jie, Qian Yigang, Chen Yali, Liu Junlong, Shao Zhufeng, Zhang Haoyun, Yang Xiaohui, Wang Jingxia, Liu Huanmin, Nie Lanjian, Huaning, Yan Magnesium, Li Huaiyang. The previous versions of the standards replaced by this standard are. ---GB/T 12442-1990. Method for testing hydroxyl content in quartz glass

1 Scope

This standard specifies the terms and definitions of the hydroxyl content test in quartz glass, the test principle, test equipment, sample requirements, test procedures, Results calculation method and representation, inspection report. This standard applies to the inspection of hydroxyl content in quartz glass.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. JC/T 2205 quartz glass terminology

3 Terms and definitions

The following terms and definitions defined by JC/T 2205 apply to this document. 3.1 Baseline baseline The line connecting the base points of the two shoulders of the absorption peak on the spectral curve.

4 Test principle

The hydroxyl content in quartz glass is linear with its light absorption intensity at a wavelength of 2.73 μm, according to Beer-Lambert law (Beer- Lambert Law (a) is quantitatively determined and the formula is given by equation (1). A=-log10(T)=kdC (1) In the formula. A --- absorbance; T --- transmittance; k --- constant, related to the nature of the absorbing material and the wavelength λ of the incident light; d --- sample thickness in millimeters (mm); C --- The hydroxyl content of the sample in micrograms per gram (μg/g).

5 test equipment

5.1 The measurable wavelength range shall be 2.50μm~3.10μm, and the spectrophotometer or infrared light with a transmittance measurement accuracy of not less than 1% Spectrometer. 5.2 Vernier calipers and other measuring tools with a graduation value not greater than 0.02 mm. 5.3 Fixed diaphragm. When necessary, select the appropriate fixed diaphragm according to the shape of the sample. ......

Image     

Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 12442-2019_English be delivered?

Answer: Upon your order, we will start to translate GB/T 12442-2019_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 12442-2019_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 12442-2019_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.

Question 5: Should I purchase the latest version GB/T 12442-2019?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 12442-2019 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.