GB/T 7962.23-2019 English PDF

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GB/T 7962.23-2019: Test method of colourless optical glass -- Part 23: Resistance to climatic
Status: Valid

GB/T 7962.23: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 7962.23-2019	199	Add to Cart	3 days	Test method of colourless optical glass -- Part 23: Resistance to climatic	Valid
GB/T 7962.23-1987	199	Add to Cart	2 days	Colourless optical glass test methods--Youngmodulus torsional rigidity modulus Poissonratio	Obsolete

Similar standards

GB/T 7247.1   GB/T 41310   GB/T 39118   GB/T 7962.22   GB/T 7962.21   GB/T 7962.15   

Basic data

Standard ID: GB/T 7962.23-2019 (GB/T7962.23-2019)
Description (Translated English): Test method of colourless optical glass -- Part 23: Resistance to climatic
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: L50
Classification of International Standard: 81.040.01
Word Count Estimation: 10,117
Date of Issue: 2019-08-30
Date of Implementation: 2020-03-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 7962.23-2019: Test method of colourless optical glass -- Part 23: Resistance to climatic

---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 of colourless optical glass - Part 23.Resistance to climatic ICS 81.040.01 L50 National Standards of People's Republic of China Colorless optical glass test method Part 23.Weather stability 2019-08-30 released 2020-03-01 Implementation State Administration for Market Regulation Issued by China National Standardization Administration

Table of contents

Preface Ⅲ 1 Scope 1 2 Normative references 1 3 Principle 1 4 Environmental conditions 2 5 Reagent 2 6 Instrument 2 7 Preparation of the tested sample 3 8 Test Step 3 9 Data processing and judgment 3 10 Test report 4

Foreword

GB/T 7962 "Test Method for Colorless Optical Glass" is divided into the following 23 parts. ---Part 1.Refractive index and dispersion coefficient; ---Part 2.Fizeau Plane Interferometry for Optical Uniformity; ---Part 3.Optical uniformity holographic interferometry; ---Part 4.Temperature coefficient of refractive index; ---Part 5.Stress birefringence; ---Part 6.Young's modulus, shear modulus and Poisson's ratio; ---Part 7.Streakness; ---Part 8.Bubble degree; ---Part 9.Light absorption coefficient; ---Part 10.X-ray resistance; ---Part 11.Precision test of visible refractive index; ---Part 12.Intraspectral transmittance; ---Part 13.Thermal conductivity; ---Part 14.Acid resistance stability; ---Part 15.Moisture resistance stability; ---Part 16.Linear expansion coefficient, transition temperature and sag temperature; ---Part 17.Ultraviolet and infrared refractive index; ---Part 18.Kjeldahl hardness; ---Part 19.Abrasion; ---Part 20.Density; ---Part 21.Alkali resistance stability; ---Part 22.Phosphoric acid resistance stability; ---Part 23.Weather resistance stability. This part is part 23 of GB/T 7962. This section was drafted in accordance with the rules given in GB/T 1.1-2009. Please note that certain contents of this document may involve patents. The issuing agency of this document is not responsible for identifying these patents. This part was proposed by China Machinery Industry Federation. This part is under the jurisdiction of the National Optical and Photonics Standardization Technical Committee (SAC/TC103). Drafting organizations of this section. Chengdu Guangming Optoelectronics Co., Ltd., China Ordnance Industry Standardization Institute, Shanghai Optics, Chinese Academy of Sciences Institute of Precision Machinery. The main drafters of this section. Wang Hong, Zhou Huimin, Zhou Siyu, Yun Shidong, Ma Botao, Li Weina, Wang Congjuan. Colorless optical glass test method Part 23.Weather stability

1 Scope

This part of GB/T 7962 specifies the principles, environmental conditions, test procedures, data processing and classification of colorless optical glass weather resistance. This section applies to colorless optical glass, other types of glass can be used as reference.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. GB/T 678 Chemical reagent ethanol (anhydrous ethanol) GB/T 903 colorless optical glass GB/T 1185-2006 Surface defects of optical parts GB/T 6682-2008 Analysis laboratory water specifications and test methods GB/T 12591 Chemical reagent ether

3 Principle

After the colorless optical glass is corroded by the atmosphere, the surface will produce "white spots" or "haze" and other metamorphic layers. The degree of erosion of the glass surface is determined by measuring the difference in turbidity before and after the test sample is eroded. Turbidity measurement is carried out with an integrating sphere turbidity meter. The principle diagram of the optical glass turbidity measuring device is shown in Figure 1.

4 Environmental conditions

Unless otherwise specified, the test should be performed under the following environmental conditions. a) Temperature. 15℃~35℃; b) Relative humidity. 20%~80%; c) Atmospheric pressure. the air pressure of the test site.

5 Reagents

5.1 General During the test, unless otherwise specified, chemical reagents should be used. 5.2 Water It shall meet the requirements of secondary water specified in GB/T 6682-2008. 5.3 Ethanol (C2H5OH) It should meet the chemical purity level and above specified in GB/T 678. 5.4 Ether (C4H10O) It should meet the chemical purity level and above specified in GB/T 12591. 5.5 Mixed solvent of ethanol and ether The volume ratio of the mixed solvent is. ethanol. ether=1.9.

6 Instruments

6.1 Environmental test chamber The temperature deviation of each measuring point of the environmental test box is within ±2℃, and the relative humidity stability tolerance is ≤3%. 6.2 Integrating sphere turbidity meter The relative error of the displayed value of haze is ≤5%. 6.3 Ultrasonic equipment The cleaning tank is filled with water and can be heated to 50°C. 6.4 Drying dish Use silane mixture (absorb water) as desiccant. 6.5 Microscope Magnification. 80×~100×.

7 Preparation of the tested sample

7.1 Material requirements The tested sample should have no visible streaks and inclusions, and the stress birefringence of the rough glass of the tested sample should meet the requirements of GB/T 903. The central stress birefringence is less than or equal to 6nm/cm. 7.2 Processing quality and quantity Two large surfaces are polished, the size of the tested sample is (30.0±0.1)mm×(30.0±0.1)mm×(10.0±0.1)mm, surface roughness Ra= 0.012μm, surface defects meet B/2×0.63 specified in B.1 of GB/T 1185-2006, polished chamfer C0.2, surface shape. N=3, ΔN=0.5; the other surfaces are finely ground, and the surface roughness Ra=0.8μm. Number of tested samples. 3 pieces. 7.3 Pretreatment of the tested sample Clean the sample with ultrasonic equipment or use long-fiber cotton soaked in ethanol and ether mixed solvent to clean the tested sample, and place it in the environmental conditions specified in Chapter 4. After the surface of the tested sample is dry, put it in a drying dish to be tested. But the storage time should not exceed 72h.

8 test steps

8.1 Initial test. Take the tested sample out of the drying dish, the turbidity H0 of the tested sample before erosion, record the test value, and calculate 3 tested samples The average value of the turbidity H0 of the sample before erosion. 8.2 Place the sample to be tested in an environmental test box saturated with water vapor with a relative humidity of 90%, heat up to 40℃, and then 40℃~50℃ Alternately circulate every 1h, and conduct 15 cyclic program tests. The cycle program is shown in Figure 2. 8.3 Complete 15 cyclic program tests, take out the tested sample from the environmental test box, record its test value, and calculate the erosion of 3 tested samples The average value of the subsequent turbidity H1.

9 Data processing and judgment

9.2 According to the turbidity difference ΔH, it is judged according to the weather resistance category of the colorless optical glass listed in Table 1. 10 Test report 10.1 The test report should include the following information. a) The standard number of this part. b) The erosion time of the tested sample (h). c) The turbidity difference (%). d) Determine the weather stability category CR. e) Record any abnormal characteristics during the test. ......

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