SL-SF08 Spectacle Frame Perspiration Resistance Tester

Introduction

The eyeglass frame sweat test machine is designed to evaluate the frames' resistance to sweat corrosion, ensuring they can be safely worn for two years or longer.

This prevents discoloration and plating loss caused by sweat corrosion, thereby safeguarding the wearer's health and safety. Specifically developed in accordance with standards such as ISO 12870, this device features advanced temperature control technology that maintains consistent and stable testing temperatures. With an adjustable timer and thermometer, it meets the specific requirements of various standards regarding test duration and temperature. The equipment uses German-imported, corrosion- and impact-resistant glass containers, equipped with safety mechanisms that not only ensure safe operation but also make the testing process more intuitive, allowing for real-time monitoring and precise control over the test progress.

Standards 

GB/T14214, QB2457, ISO12870 

Parameters

1. Test temperature: 55℃ ± 5℃

2. Test duration: 8, 16 hours ± 30 minutes

3. Power supply: 220V 50Hz

4. Machine size: 30×30×33CM (length×width×height)

5. Weight: 10KG

6. Test glass cylinder size: φ220, height 100mm (with a cover, frame support, a glass cylinders is provided) 

7. Test sweat provided by the user

Artificial sweat solution, comprised of the following:

a) lactic acid, >85 % mass fraction purity;

b) sodium chloride (of recognised pro analysis, p.a., grade or better);

c) water, conforming to grade 3 of ISO 3696. Using suitable containers, weigh (50 ± 0,1) g of lactic acid and (100± 0,1) g of sodium chloride and dissolve in 900 ml of water. Using the flask (8.3.1.3), make up to 11 with water.

8.3.2 Test Procedure

8.3.2.1 Cover the base of the container with the artificial sweat solution to a minimum depth of 10 mm so that the lowest part of the (lowest, if stacked) frame shall be not less than 12 mm above the solution.

Place test sample 1, fitted with the test lenses, on the supports , with the sides open to the fullest extent (for frames with sprung hinges, opened to the fullest natural extent without activating the spring mechanism), and with the bottom edges of the sides resting on the supports (see Figure D.1). Ensure that the spectacle frame does not touch other samples or the container walls.

Close the container, place it in the oven and maintain at (55 ±5) °C.

8.3.2.2 After (8±0.5) h, remove each sample and immediately wash with water. Dry without rubbing, using a soft cloth.

8.3.2.3 Within 30 min, examine each test sample under the inspection conditions described in Z.2. By comparison with an identical untested spectacle frame, check for and record any spots or change in colour see the requirements in 4.11.

8.3.2.4 Replace the test sample(s) on the support(s), close the container and maintain the test temperature of (55 ± 5) C for a further (16 ± 0,5) h. After completion of this second period, remove, clean and dry the samples without rubbing, using a soft cloth.  

8.3.2.5 Within 30 min, examine those areas of each sample that are liable to come into prolonged contact with the skin of the wearer under the inspection conditions described in Z.2. By comparison with and identical untested spectacle frame, check for and record any corrosion, surface degradation or separation of any coating layer - see the requirements in 4.11.

4.11 Regulations for visual inspection of samples 

a) no spotting or obvious alteration in colour (except for loss of gloss to the surface) anywhere on the frame, excluding joints and screws, after testing for 8 h, and

b) no corrosion, surface degradation (e.g., roughness, orange peel appearance) or separation of any coating layer on the parts liable to come into prolonged contact with the skin during wear, i.e. the insides of the sides, bottom and lower parts of the rim and the inside of the bridge, after testing for a total of 24 h.

If the spectacle frame is made from natural organic materials and the manufacturer recommends use of a product such as a cream or wax for its maintenance, then, before testing, the frame(s) shall be prepared with this product in accordance with the manufacturer's instructions. At the end of the test, if the framed fails to meet this requirement when checked for colour change or surface degradation, wait for one day before checking again for colour change or surface degradation. If the frame has recovered its original colour and surface finish, the spectacle frame is considered to have passed the test; if the frame remains discoloured, the frame is considered to have failed the test.