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BSI PD ISO/TR 21958:2019

BSI PD ISO/TR 21958:2019

$142.49

Ophthalmic optics. Review of the test methods used to assess scratch and abrasion resistance of spectacle lenses

Published By Publication Date Number of Pages
BSI 2019 26
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This document describes the most commonly used test methods considered in standardization work relating to scratch and abrasion resistance of plastic spectacle lenses along with their technical capacities and limitations. It includes the ISO� test method for assessment of claims for basic abrasion resistance in ISO� 8980-5.

This document is intended to be of benefit to any future interest in ISO� standardization on scratch and abrasion resistance of spectacle lenses.

PDF Catalog

PDF Pages PDF Title
2 undefined
6 Foreword
7 1 Scope
2 Normative references
3 Terms and definitions
4 Background
8 5 Mechanisms of mechanical abrasion and scratching of lens surfaces
5.1 Discussion and scratch mechanisms
10 5.2 Testing and the different forms of damage
11 5.3 ​Assessing surface damage
6 Test method description
6.1 Steel wool test
6.1.1 Principle
6.1.2 Description
13 6.1.3 Pros and cons
6.2 Tumble test
6.2.1 Principle
14 6.2.2 Description
15 6.2.3 Pros and cons
6.3 Eraser test
6.3.1 Principle
6.3.2 Description
17 6.3.3 Pros and cons
6.4 Bayer test (Oscillating abrasive grain test)
6.4.1 Principle
18 6.4.2 Description
19 6.4.3 Pros and cons
6.5 Nano scratch (Diamond point loading device)
6.5.1 Principle
20 6.5.2 Description
6.5.3 Pros and cons
21 6.6 Taber abrasion wheel test
6.6.1 Principle
6.6.2 Description
22 6.6.3 Pros and cons
6.7 ISO 8980-5 “Minimum requirements for spectacle lens surfaces claimed to be abrasion-resistant”
6.7.1 Principle
23 6.7.2 Description
6.7.3 Pros and cons
24 7 Conclusion
25 Bibliography

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BSI PD ISO/TR 21958:2019
$142.49