GB/T 37991-2019 English PDF

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GB/T 37991-2019: Measuring method for ultra-thin glass reheating line shrinkage - Dilatometer method
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 37991-2019	119	Add to Cart	3 days	Measuring method for ultra-thin glass reheating line shrinkage - Dilatometer method	Valid

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Basic data

Standard ID: GB/T 37991-2019 (GB/T37991-2019)
Description (Translated English): Measuring method for ultra-thin glass reheating line shrinkage - Dilatometer method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: Q34
Classification of International Standard: 81.040.30
Word Count Estimation: 6,699
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 37991-2019: Measuring method for ultra-thin glass reheating line shrinkage - Dilatometer method

---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.
Measuring method for ultra-thin glass reheating line shrinkage - Dilatometer method ICS 81.040.30 Q34 National Standards of People's Republic of China Ultra-thin glass reheat line shrinkage test method Dilatometer 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 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. Hainan Zhonghang Special Glass Materials Co., Ltd., Hainan Zhonghang Special Glass Technology Co., Ltd., China Building Materials Inspection and Certification Group Co., Ltd. The main drafters of this standard. Pan Guozhi, Zhao Huifeng, Jiang Hong, Lu Wei, Du Dayan, Li Na, He Jianxiong, Zhou Li, Huang Xiaoye. Ultra-thin glass reheat line shrinkage test method Dilatometer

1 Scope

This standard specifies the terms and definitions, test principles, test devices and conditions for testing the shrinkage rate of ultra-thin glass reheating line by the dilatometer method. Samples, test procedures, results calculations, test reports, etc. This standard is applicable to the test of the shrinkage rate of ultra-thin glass reheating line with thickness of 0.4mm~1.1mm, and the reheating line of other thickness flat glass The test for shrinkage can be referred to this standard.

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. GB/T 15764 flat glass terminology

3 Terms and definitions

The following terms and definitions as defined in GB/T 15764 apply to this document. 3.1 Reheat line shrinkage rate reheatinglineshrinkage The ultra-thin glass product is heated again to a specific temperature for a certain period of time, and after cooling to room temperature for a certain period of time, the amount of shrinkage in the length direction is the same as the original length. The ratio of degrees.

4 Test principle

The glass sample is cooled by reheating, that is, it is heated to a specific temperature at a set heating rate from room temperature, and then kept for a while, and then kept for a while. When the set cooling rate is lowered to room temperature, the original length Li shrinks relative to before heating. Measuring the length of the glass with a thermal dilatometer The amount of shrinkage ΔLi, the ratio of the amount of shrinkage to the original length, is the reheat line shrinkage of the glass sample, as shown in FIG. Description. Li --- original length of the sample; ΔLi—the amount of shrinkage after reheating of the sample. Fig.1 Schematic diagram of length change after reheating of glass sample ......

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