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This part is drafted in accordance with the rules given in the GB/T 1.1-2009.
This standard has been redrafted and modified adoption of International Standard ISO/TS 24348:2014 Ophthalmic Optics — Spectacle Frames — Method for the Simulation of Wear and Detection of Nickel Release from Metal and Combination Spectacle Frames.
This standard is subject to structural adjustments with respect to the ISO/TS 24348:2014, which are numbered in the order of reference in the text. Annex D has been adjusted to Annex A, and Annexes A and B have been extended to Annexes B and C respectively.
The technical deviations between this standard and the International Standard ISO/TS 24348:2014, together with their justifications, are given below:
— the adjustments of technical difference are made for the normative references in this standard so as to adapt to the technical conditions in China. The adjustment is mainly reflected in Clause 2 Normative References with the specific adjustments as follows:
? ISO 12870 is replaced by GB/T 14214-2019 which is identical with the international standard;
? addition of ISO 12870:2016;
— the contents related to measurement of spectacle frame surface area in Annex C of ISO/TS 24348:2014 are included in 5.4.1 "Sample area".
— addition of “3D scanning technology may be applied to measure the surface area.” in the Note of 5.6.1.
— deletion of Items b), e), f), h) in Clause 6 of ISO/TS 24348:2014.
For the purposes of this standard, the following editorial changes have also been made:
— in order to be consistent with China's standard system, the standard name is changed to Spectacle Frames — Requirement and Method for the Detection of Nickel Release;
— addition of the notes for sourcing and other information which are irrelevant to China's situation.
This standard was proposed by is under the jurisdiction of China National Light Industry Council.
Spectacle Frames — Requirement and Method for the Detection of Nickel Release
1 Scope
This standard specifies the requirements, methods for accelerated wear and corrosion of nickel release from coated metal and combination spectacle frames, and for detection, calculation and test report of release of nickel.
This standard is applicable to the spectacle frames produced with materials and/or surface treatments containing nickel.
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 14214 Spectacle Frames — General Requirements and Test Methods (GB/T 14214-2003, ISO 12870:1997, MOD)
ISO 12870:2016 Ophthalmic Optics — Spectacle Frames — Requirements and Test Methods
3 Requirements
Those parts of metal and combination spectacle frames that come into direct and prolonged contact with the skin of the wearer shall not have a nickel release greater than 0.5 μg/(cm2·week).
Spectacle frames having a coating shall be subjected to the test specified in Clauses 4 and 5.
For spectacle frames that are made of homogeneous alloy or pure metal and are uncoated, go directly to the nickel release test procedure in Clause 5.
The parts to be tested shall be in accordance with ISO 12870:2016, 4.2.3, and shall include:
— the rear surface of rims;
— the rear and lower surface of the bridge, the rear and upper surface of any brace bar and any other nasal-bearing surfaces, including metal nose pads;
— sides, excluding the joints and the zone immediately around the joints, and parts intended to be protected by plastic endcovers.
See Annex A for spectacle frames made from materials or surface treatments containing nickel capable of releasing small amounts of nickel.
4 Method for Accelerated Wear and Corrosion
4.1 Principle
The items to be tested are exposed to a corrosive atmosphere before being placed in a tumbling barrel together with a wear medium of abrasive paste and granules. The barrel is rotated so as to subject the test pieces to wear from the wear medium. The items are then tested for nickel release in accordance with Clause 5.
4.2 Reagents and materials
4.2.1 General
Unless otherwise specified, all reagents and materials that can come into contact with samples or reagents shall be demonstrably free of nickel, and all reagents shall be of recognized analytical grade or better.
4.2.2 Reagents and materials for the corrosion procedure
4.2.2.1 Container
Container, with a lid and a device for suspending the test pieces, and all parts made of inert material (e.g. glass or plastic).
4.2.2.2 Corrosive medium
Prepared by dissolving 50 g DL-lactic acid, >85% purity, and 100 g sodium chloride in 1 000 ml deionized water.
4.2.2.3 Degreasing solution
Being an appropriately diluted, neutral, commercially available detergent, e.g. a 0.5% aqueous solution of sodium dodecylbenzene sulfonate.
4.2.2.4 Deionized water
Specific conductivity maximum 1 μS/cm.
4.2.2.5 Oven
Oven, capable of maintaining a temperature of (50 ± 2) °C.
4.2.3 Reagents and materials for the wear procedure
4.2.3.1 Tumbling barrel and retaining assembly:
— barrel of hexagonal cross-section and internal diameter of 19 cm perpendicular distance between opposite sides designed to rotate around its axis, which is orientated horizontally (see Figure 1);
— retaining assembly, suitable for attaching the test items so that they do not come into contact with each other during tumbling;
4.2.3.2 Rotating system, capable of imparting to the barrel (4.2.3.1) a constant (30 ± 2) rotations per minute. The rotating system shall be capable of allowing the direction of rotation to be reversed.
Foreword II
1 Scope
2 Normative References
3 Requirements
4 Method for Accelerated Wear and Corrosion
5 Method for the Determination of Nickel Release
6 Test Report
Annex A (Informative) Articles Made from Materials Capable of Releasing Small Amounts of Nickel
Annex B (Informative) Statistical Uncertainty of the Test Procedure and Interpretation of Results
Annex C (Informative) Rules for Production and Preparation of Reference Material
Bibliography
