GB/T 4121-2014 English PDF

US$149.00 · In stock
Delivery: <= 2 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 4121-2014: Test method for stability to thermal darkening of quartz glass
Status: Valid

GB/T 4121: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 4121-2014	149	Add to Cart	2 days	Test method for stability to thermal darkening of quartz glass	Valid
GB/T 4121-1983	199	Add to Cart	2 days	The test method for stability to thermal darkening of silica glass	Obsolete

Similar standards

GB/T 42800   GB/T 32661   GB/T 30985   GB/T 45823   GB/T 3284   GB/T 5949   

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Older Standard (superseded by this standard): GB/T 4121-1983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

---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 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. ......

Image     

Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 4121-2014_English be delivered?

Answer: Upon your order, we will start to translate GB/T 4121-2014_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 2 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 4121-2014_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 4121-2014_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 4121-2014?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 4121-2014 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.