Powered by Google-Search & Google-Books Chinese Standards Shop Database: 169760 (Sep 19, 2020)
HOME   Quotation   Tax   Examples Standard-List   Contact-Us   View-Cart


Chinese Standard: 'GBT16920-2015'
Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusRelated Standard
GB/T 16920-2015English150 Add to Cart 0--15 minutes. Auto immediate delivery. Glass -- Determination of coefficient of mean linear thermal expansion Valid GB/T 16920-2015
GB/T 16920-2015Chinese18 Add to Cart <=1-day [PDF from Chinese Authority, or Standard Committee, or Publishing House]

  Google-Books (Full-PDF will be auto-delivered in 0~10 mins):   GB/T 16920-2015  GB/T 15726-1995
In 0~10 minutes time, full copy of this English-PDF will be auto-immediately delivered to your email. See samples for translation quality.  
GB/T 16920-2015
ICS 81.040.01
N 64
Replacing GB/T 16920-1997
Glass - Determination of coefficient of
mean linear thermal expansion
玻璃 - 平均线热膨胀系数的测定
(ISO 7991.1987, NEQ)
Issued by. General Administration of Quality Supervision, Inspection and
Standardization Administration of PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 4 
4 Instruments ... 5 
5 Test samples ... 6 
6 Procedures ... 7 
7 Representation of results ... 8 
8 Test of instrument performance ... 10 
9 Test report ... 11 
Appendix A (Informative) Collimation self-adjusting device for sample and push
rod shaft ... 12 
Glass - Determination of coefficient of
mean linear thermal expansion
1 Scope
This standard specifies the method for determining the coefficient of mean
linear thermal expansion of elastic solid glass.
This standard applies to the determination of the coefficient of mean linear
thermal expansion of glass of various materials.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB/T 1216 External micrometer
GB/T 21389 Vernier dial and digital display calipers
3 Terms and definitions
The following terms and definitions apply to this document.
Coefficient of mean linear thermal expansion
α (t0; t)
Within a certain temperature interval, the ratio of the length change of the
specimen to the temperature interval and the initial length of the specimen,
expressed by the formula (1).
performance. The method is as shown in the calibration and verification of the
performance test of instrument.
4.3 Heating furnace
The heating furnace shall be matched with the dilatometer device. The upper
limit of temperature shall be about 50 °C higher than the expected determined
temperature of transformation (t). The working position of the heating furnace
as relative to the dilatometer shall have a reproducibility within 0.5 mm in the
axial and radial directions.
Within the range of test temperature (i.e., the upper limit temperature is 150 °C
lower than the highest expected transformation temperature tg, at least the
temperature difference between 300 °C and tg is greater than 150 °C, and shall
not be lower than 300 °C), throughout the determination interval of the entire
specimen length, the furnace’s temperature shall be constantly controlled within
±1 °C.
The heating furnace shall be able to meet the control requirements of 5 °C/min
± 1 °C/min. Within the range of the test temperature, the ideal rate of
temperature rise is 5 °C/min ± 1 °C/min.
4.4 Temperature measuring device
In the temperature range of t0 and t, it may be able to accurately determine the
temperature of the specimen, the error is less than ±1 °C.
5 Test samples
5.1 Shape and size
The specimen is usually rod-shaped, the shape of which depends on the type
of dilatometer used, the length L0 shall be at least 5 × 105 times the resolution
of the length measuring device of the dilatometer.
Note. For example, the specimen may be a round bar which has a diameter of
5 mm, length of 50 mm ± 1 mm; or according to the structure of the dilatometer,
it may also be a square bar which has a section of 5 mm × 5 mm and a length
of 25 mm ~ 100 mm. The specimen of other square or rectangular sections
shall be able to ensure the accuracy and repeatability of the measurement (see
Appendix A).
5.2 Preparation of specimen
Select the glass which has no defects such as stones, bubbles, and streaks.
Use the mechanical cutting or hot working methods to prepare it into the shape
and size required for the specimen, then make it annealed. The annealing
difference between the hot joint of the thermocouple and the specimen, the
apparent temperature of the specimen shall plus the corrected value.
Note. The magnitude of this corrected value depends on the rate of temperature
change as well as the rate of heat exchange between the heating furnace and
the specimen. Fundamentally, the corrected value is to be determined by
comparison with......
Related standard:   GB/T 35595-2017  GB/T 35596-2017
Privacy   ···   Product Quality   ···   About Us   ···   Refund Policy   ···   Fair Trading   ···   Quick Response
Field Test Asia Limited | Taxed in Singapore: 201302277C | Copyright 2012-2020