Standard No.:	GB/T 7962.23-2019
Chinese Name:	无色光学玻璃测试方法 第23部分：耐气候稳定性
English Name:	Test method of colourless optical glass—Part 23:Resistance to climatic
Professional Classification:	L50 Optoelectronic device assembly
ICS Classification:	81.040.01 Glass in general
Issued by:
Issued on:	2019-08-30
Implemented on:	2020-03-01
Status:	VALID
Language:	English
File Format:	PDF
Word Count:	6000 words
Price(USD):	180 (USD)
Delivery:	via email in 1-3 business day

1 Scope

This part of GB/T 7962 specifies the principle, environmental conditions, test steps, data processing and classification for the resistance to climatic of colourless optical glass.

This part is applicable to colourless optical glass, and may serve as a reference for other types of glass.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 678 Chemical reagent - Ethanol
GB/T 903 Colourless optical glass
GB/T 1185-2006 Surface imperfections of optical elements
GB/T 6682-2008 Water for analytical laboratory use - Specification and test methods
GB/T 12591 Chemical reagent - Diethyl ether

3 Principle

The surface of colourless optical glass will produce metamorphic layers such as "white spot" or "blushing" after being eroded by the atmosphere. The degree of erosion on the glass surface is determined by calculating the difference between turbidities of the sample under test before and after erosion measured using a turbidimeter with integrating sphere. See Figure 1 for the schematic diagram for optical glass turbidity measuring device.