Test Methods for Paints and Varnishes According to ISO 16474-3

Are you uncovering the many ways that lab light sources can be utilized? Investigating the various ways light sources can be used in the laboratory doesn’t always have to involve a microscope. In fact, there are a number of different methods of exposure with lab light sources that you might want to consider depending on your need. Direct exposure with fluorescent UV lamps is one of the most common methods of using lab light sources. With this method, the microscope’s illumination system is activated to provide illumination for a sample directly in front of it. This can be used for almost any type of imaging, including fluorescence and non-fluorescence, as well as dark-field or phase contrast imaging. Direct exposure to laboratory light sources – Fluorescent UV Lamps is a great option for those who are interested in short periods of observation and inspection.

There are many ways to expose the laboratory light sources, such as using UVA-340 lamps, UVB-313 lamps. Also some customers choose the method of daylight behind window glass with UVA-351 lamps. However, the most commonly used method is still to use UVB-313 lamps to complete the test requirements of ISO-16474-3. ISO 16474-3 :2013 applies to the paints and varnishes performance test on the surface of your test samples. The BS EN ISO 16474-2 :2014 and ISO 16474-2 :2013 are consistent in exposure test methods for laboratory light sources.

Test Machine for Paints and Varnishes According to ISO 16474-3
Equipment Model WE-UV600-C WE-UV800-C
Internal Dimensions W:1150*H:400mm*D:400mm W:1150*H:500mm*D:400mm
External Dimensions W:1300*H:1450mm*D:500mm W:1300*H:1630mm*D:700mm
Lighting Temperature +50℃~+75℃ +50℃~+75℃
Temperature Fluctuation ≤±2.0℃ ≤±1.5℃
Condensing Temperature +40℃~+60℃ +40℃~+61℃
Temperature Uniformity ≤±1.0℃ ≤±1.0℃
Fluorescent UV Lamps UVA-340 (315~400nm)|UVB-313(280~315nm) UVA-340 (315~400nm)|UVB-313(280~315nm)
Test Area for Samples 100*27mm*2 Pieces 100*63mm*1 Piece
Lamps Quantity 8 Pieces (ATLAS or Q-LAB) 8 Pieces (ATLAS or Q-LAB)
Centre Distance Centre Distance Between Lamp: 70mm Centre Distance Between Lamp: 70mm
Irradiation Intensity 0.45W ~ 1.0W/ cm2 0.45W ~ 1.0W/ cm2
Testing Time 0~999H, Adjustable 0~999H, Adjustable
Humidity Range 45%~90%R.H 45%~90%R.H
Max Thickness Test Samples with 18mm Test Samples with 20mm
Power Volatage AC 220V, 230V, 50Hz, 60Hz, 1 Phase AC 220V, 230V, 50Hz, 60Hz, 1 Phase
Gross Weight 125 KGS 185 KGS
The Wewon’s UV test chamber uses fluorescent ultraviolet lamps as the light source to conduct accelerated weather resistance tests on materials by simulating ultraviolet radiation and condensation in natural sunlight to obtain the results of material weather resistance. It can simulate environmental conditions such as ultraviolet light, rain, high temperature, high humidity, condensation, darkness, etc. in natural climates. By reproducing these conditions, they can be combined into a cycle, and it can be automatically executed to complete the number of cycles.

The equipment uses 8 UV fluorescent lamps with a rated power of 40W as the light source. Ultraviolet fluorescent lamps are distributed on both sides of the machine (4 on each side) or on the top (8) for direct irradiation (there are UVA-340 and UVB-313 light sources for users to choose configuration). The UV aging test is a test method to evaluate the UV light resistance of new materials. In just a few weeks or months, reproducible and reliable aging test data can be obtained through the UV aging test; its short-wavelength UV light and condensation cycle The system can realistically simulate the damaging effects of sunlight, dew and rain on materials.

How to Use Wewon’s UV Test Chamber to Complete the ISO 16474-3 with UVB 313 Lamps ? In order to help customers understand the test methods and test conditions of ISO 16474-3 more easily, The Wewon’s engineer has prepared a video guidance to make the customer easier understand how to complete the ISO 16474-3 with UVB 313 lamps. After you understand this operation step, you can also change to UVA-340 lamps for other similar experiments.
Test Standard of ISO 16474-3 :2013 Methods of Exposure to Laboratory Light Sources – Fluorescent UV Lamps Test Standard
● Step 1: Conect the Water Pipes Succssfully Then Power on the Machine Operation Steps
● Step 2: Follow the steps in this video. Because this step is the specific operation method for ISO 16474-3 test standard with UVB 313 lamps.
Operation Steps for ISO 16474-3 2013 Methods of Exposure to Laboratory Light Sources - Fluorescent UV Lamps
If your laboratory room can not install water pipes, Then you can use the bucket to fill water tank of the machine with clean water. 1. Tips and Note
Test Mothods for ISO 16474-3 with UVB 313 Lamps 2. Tips and Note
ISO 16474-1 → Part 1: General Guidance
ISO 16474-2 → Part 2: Xenon-Arc Lamps
ISO 16474-3 → Part 3: Fluorescent UV Lamps
ISO 16474-4 → Part 4: Open-Flame Carbon-Arc Lamps
3. Tips and Note
When using the UV test chamber for aging tests, the surface temperature of the sample is an important exposure parameter. Generally, high temperature will speed up the polymer degradation process, and the allowable test temperature should be determined according to the test material and the aging performance evaluation index. Fluorescent UV lamps emit less infrared rays than xenon lamps and carbon arc lamps, and the heating of the sample surface is basically formed by hot air convection.

Therefore, the temperature difference between the black panel thermometer, black standard thermometer, specimen surface and exposure chamber air is very small. The following two exposure methods are recommended: exposure method 1 and 2 respectively, of course customers can also use other methods, but the exposure conditions should be stated in the test conditions. The two exposure methods are as follows:
After the test sample was exposed to light for a period of time, This is followed by a cycle test with a non-irradiation period during which the temperature changes and condensation forms on the specimen. Exposure Method 1
The test shall comply with the provisions of the standard. If no cycle conditions are specified, the following cycles are recommended:
Expose to radiation for 4 hours or 8 hours at the black standard temperature of 60°C±3°C, and then expose for 4 hours at the black standard temperature of 50°C±3°C without condensation.
Note: ①: The aging degradation of some polymers (such as PVC) is very sensitive to temperature. In this case, it is recommended to use a radiation exposure temperature below 60°C (such as 50°C) to simulate a cooler climate.
Note: ②: When the procedure of radiation exposure followed by condensation exposure is selected, the allowable radiation or condensation exposure period is at least 2 hours to ensure that the conditions of each exposure period are balanced.
The test specimens are continuously exposed to radiation and have a cycle test with timed water sprays. The test shall comply with the provisions of the standard. If not specified, the following test conditions are recommended: Exposure Method 2
Radiation exposure for 5 hours at black standard temperature of 50°C±3°C and air relative humidity (10±5)﹪, then continue irradiation exposure at black standard temperature of 20°C±3°C and spray water for 1 hour.
Note: ①: The exposed surface of the sample is condensed and wetted by the moisture condenser in the UV test chamber. Moisture is generated by the heating of water in a container placed under the sample holder.
Note: ②: When the UV test chamber does not comply with Exposure Method 1, methods of providing control of relative humidity in the exposure room, or spraying the sample with pure water or an aqueous solution simulating acid rain can be adopted. Please refer to the requirements of ISO 4892-3 for water use.
Different Fluorescent UV Lamps Types & Choice for for Paints and Varnishes Test: (1) UVA-340 simulates the ultraviolet part of sunlight and is mainly used for photoaging tests of outdoor products; (2) UVA-351 simulates the ultraviolet part of sunlight passing through the window glass, and is mainly used for photoaging tests of indoor products; (3) UVB-313: Widely used as a quick and time-saving test for durable materials, it will accelerate the aging of materials and sometimes lead to abnormal results. It must be used with the consent of customers.
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