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GB/T 28196-2011 English PDF

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GB/T 28196-2011: Determination of annealing point and strain point for glass
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Basic data

Standard ID GB/T 28196-2011 (GB/T28196-2011)
Description (Translated English) Determination of annealing point and strain point for glass
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard N64
Classification of International Standard 81.040.01
Word Count Estimation 10,142
Date of Issue 2011-12-30
Date of Implementation 2012-09-01
Adopted Standard ISO 7884-7-1987, MOD
Regulation (derived from) National Standard Approval Announcement 2011 No.23
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 test methods for measuring glass annealing point and strain point by bending beam method. This standard applies to all production of glass, glass devitrification phenomenon can not occur in the sample preparation and testing process.

GB/T 28196-2011: Determination of annealing point and strain point for 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.
Determination of annealing point and strain point for glass ICS 81.040.01 N64 National Standards of People's Republic of China Glass annealing point and strain point test method (ISO 7884-7. 1987, MOD) Issued on. 2011-12-30 2012-09-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard is based on GB/T 1.1-2009 given rule drafting. This revised standard adopts ISO 7884-7. 1987 "Determination of bending beam with glass annealing point and strain point." And ISO 7884-7. 1987 The main differences are. --- Removed the original in Chapter 1, "object"; --- Removed the original Chapter 3, "References." The standard proposed by China National Light Industry Council. This standard by National Instrument Standardization Technical Committee on Glass (SAC/TC178) centralized. This standard was drafted. Glass National Light Industry Product Quality Supervision and Inspection Center. The main drafters of this standard. Du Yuhai, Yuan Chunmei, the original Yu Ling, Liu Bojun, Yang Jianxin. Glass annealing point and strain point test method

1 Scope

This standard specifies the test method for determining the glass annealing point and strain point by beam bending method. This standard applies to all production of glass, glass devitrification phenomenon can not occur in the sample preparation and testing process.

2 Terms and definitions

The following terms and definitions apply to this document. 2.1 Annealing range annealingrange It can speed for the elimination of glass products in a temperature range of stress on the industry. Glass for the comparison, it can be assumed in the range corresponding to the annealing temperature annealing point and strain point Qf4 Qf3 between. This range corresponds to 1013dPa · s near and slightly above 1013dPa · s viscosity. 2.2 Annealing point annealingpoint Temperature of the glass can basically eliminate the internal stress within minutes. When required to test the method, cooling rate measurement was (4 ± 1) ℃/min, using an appropriate magnification extensometer Measuring viscous samples beam midpoint deflection speed. Equation (1) gives a handle to the annealing point nominal deflection rate dfdt , In units of milli M/s. df ta = 44.5 × 10-12l3s × m Ic (1) Where. ls --- support beam span, in millimeters (mm); m --- midpoint load in units of grams (g); Cross-section Ic --- test supported beam moment of inertia, in cm 4 (cm4). Note. The deflection rate formula (1) under the annealing point dfdt , Equivalent to about 1013.2dPa · s viscosity. dPa · s is decipascal-seconds Abbreviation, Is a unit of viscosity, 1Pa · s = 10dPa · s. 2.3 Strain point strainpoint Temperature of the glass can basically eliminate the internal stress within hours. Push the strain point is determined by the annealing point data, the strain point is viscous scratch Qu speed deflection temperature annealing viscous 0.0316 times the speed. Note. This extrapolation is roughly equivalent to the rate of deflection 1014.7dPa · s viscosity. Principle 3 By measuring the rate of a viscous glass supported beam deflection midpoint of simple load determined annealing point. Strain point essentially extrapolation determine.

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