Standard No.:	GB/T 7962.20-2010
English Name:	Test methods of colourless optical glass—Part 20:Density
Chinese Name:	无色光学玻璃测试方法　第20部分：密度
Chinese Classification:	N05    Material and component for instrument and meter
Professional Classification:	GB    National Standard
ICS Classification:	81.040.01 81.040.01    Glass in general 81.040.01
Issued by:	AQSIQ
Issued on:	2011-1-14
Implemented on:	2011-5-1
Status:	valid
Superseding:	GB/T 7962.20-1987 Colourless optical glass test methods; Density
Language:	English
File Format:	PDF
Word Count:	6000 words
Price(USD):	180.0
Delivery:	via email in 1 business day

1 Scope This part of GB/T 7962 specifies the principle of test method, measuring conditions, steps and data processing for the density of colourless optical glass. This part is applicable to the test on density of colourless optical glass. 2 Normative references The following documents contain provisions which, through reference in this part of GB/T 7962, constitute provisions of this part. For dated references, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest editions apply to this part. GB 253 Kerosine GB/T 678 Chemical reagent - Ethanol GB/T 684 Chemical reagent - Toluene GB/T 903 Colourless optical glass GB/T 6682 Water for analytical laboratory use - Specification and test methods 3 Terms and definitions For the purposes of this part, the following term and definition apply. 3.1 density ρ mass per unit volume of a substance at a specified temperature

Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Principle 5 Reagents 6 Apparatus 7 Sample 8 Test steps 9 Data processing Annex A (Informative) Density of air, water, toluene and kerosene at different temperatures