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.
GB/T 38009-2019 The following standards are cited：
