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GB/T 7962.18-2010Test methods of colourless optical glass - Part 18: Knoop hardness (English PDF)

无色光学玻璃测试方法第18部分：克氏硬度

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

January 14, 2011

Implementation date

May 1, 2011

Scope

GB/T 7962.18-2010 is the English-translated version of 无色光学玻璃测试方法第18部分：克氏硬度.

GB/T 7962.18-2010 is the Chinese standard "Test methods of colourless optical glass - Part 18: Knoop hardness". Its scope clause reads: This part of GB/T 7962 specifies the test apparatus, test steps and data processing for the Knoop hardness of colourless optical glass.

This part is applicable to the measurement for Knoop hardness of colourless optical glass. Its clauses include terms and definitions.

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Document preview — GB/T 7962.18-2010

National Standard of the People's Republic of China

ICS: 81.040.01
Classification: N 05
Replacing: GB/T 7962.21-1987

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
6 Sample
7 Test steps
8 Data processing

1 Scope

This part of GB/T 7962 specifies the test apparatus, test steps and data processing for the Knoop hardness of colourless optical glass.

This part is applicable to the measurement for Knoop hardness 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.

ISO 9385 Glass and glass-ceramics - Knoop hardness test

3 Terms and definitions

For the purposes of this part, the following terms and definitions apply.

3.1 hardness

capability of the material partially preventing hard object from pressing into its surface

3.2 Knoop hardness

HK abbreviation of Knoop microindentation hardness, which is tested using a quadrangular pyramid diamond indenter with symmetrical corner angles of 172°30' and 130° […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Cited by

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Editions of GB/T 7962.18

Edition	Title	Revision	Status
GB/T 7962.18-2010	Test methods of colourless optical glass - Part 18: Knoop hardness	current edition	Current
GB/T 7962.21-1987	Test methods of colourless optical glass - Part 18: Knoop hardness	previous edition	Superseded

This page sells the current edition, GB/T 7962.18-2010. Earlier editions are listed for reference only.

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