ISO 9211-4-2012 pdf free.Optics and photonics – Optical coatings – Part 4: Specific test methods.
ISO 9211 describes surface treatments of components and substrates, excluding ophthalmic optics (spectacles), by the application of optical coatings and gives a standard form for their specification. It defines tile general characteristics and the test and measurement methods wherever necessary, but it is not intended to define the process method.
This part of ISO 9211 describes specific test procedures for coating environmental durability tests that are identified in ISO 92 11-3 but not described in other normative references. They are typically performed in sequence with other environmental durability tests, as shown in ISO 9211-3:2008, Annex A.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 48, Rubber, vulcanized or thermoplastic — Determination of hardness (hardness between 10 IRHD and 100 IRHD).
ISO 92 11-1, Optics and photonics — Optical coatings — Part 1: Definitions
ISO 29862, Self adhesive tapes — Determination of peel adhesion properties
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 9211-1 apply.
4 Test conditioning
Before and after subjecting a coated specimen (component or witness sample) to any inspection or test, the specimen shall be thoroughly cleaned as required to remove dirt, finger marks, smears, etc. Recommended storage time is at least 12 h after the coating process under ambient atmospheric conditions, or as specified between manufacturer and buyer.
5 Abrasion resistance tests (conditioning method 01: abrasion)
5.1 General
The purpose of these tests Is to evaluate to what extent the optical and mechanical properties of optical coatings on components and substrates are affected when subjected to specific abrading conditions at ambient atmospheric conditions.
5.2 Test conditions
5.2.1 General
Abrasion tests shall be conducted using a coating abrasion tester capable ot meeting the requirements ot 5.2 and 5.3. The length of stroke of the tester shall be approximately 20 mm when the dimensions of the specimen permit. A stroke is defined as one pass in one direction on the surface being tested. The tester shall be operated in a cycling mode. A cycle is defined as one stroke in one direction, followed by a return stroke in the opposite direction. The cycle speed shall be in the range of 30 to 90 cycles per minute. The head of the tester shall be approximately normal to the surface under test during the rubbing operation. The specimen shall be firmly held so that it does not slide during the test.
5.2.2 Moderate abrasion test
The rubbing head of the abrasion tester shall be covered with a pad of cotton cheesecloth conforming to A.1, approximately 5 mm thick and 10 mm wide. Instructions for preparing the cheesecloth pad, cover and fixture are provided in Annex B.
5.2.3 Severe abrasion test
The rubbing head of the abrasion tester shall be affixed with a standard eraser, conforming to A.2. The eraser shall be inserted into the holder so that the exposed length does not exceed 3 mm.
It is permissible to clean the eraser with a clean towel but solvents should not be used. Also, the eraser may be conditioned by rubbing it across a clean, smooth or frosted glass surface to wear away some of the rubber if embedded foreign material is suspected.
5.3 Degree of severity (conditioning method 01: abrasion)
The degrees of severity for conditioning method 01 are given in Table 1.ISO 9211-4 pdf free download.