The substrate used for the preparation of the test board of the xenon lamp weathering test box is usually the substrate used in actual use (for example: cement board, wooden board, metal board, plastic board). The application and drying methods of the coating should be consistent with the preparation method in practical application to obtain the usual film thickness.
Unless otherwise specified or agreed, a substrate conforming to GB / T9271 should be used as the substrate for the test coating.
Note: It is best to use a flat test plate suitable for the size of the test plate rack of the test box.
Unless otherwise agreed, the xenon lamp weathering test box shall be coated with the test material or coating system on the front of the board. If necessary, the back and four sides of the test panel shall be painted to protect the substrate from corrosion during the test.
The baking paint should be dried according to the conditions in actual use. The test board of the air-drying paint should be placed horizontally, and dried according to the requirements in GB9278 under the condition of (23 ± 2) ℃ and relative humidity of (50 ± 5)%. The drying time and storage time are as specified.
All test panels shall be permanently marked by a suitable method. The thickness of the coating shall be determined in accordance with GB / T13452.2.
In the case of testing in a series of different periods, each paint should prepare enough test panels.
If required by the xenon lamp weathering test box, each sample should be prepared at least one more plate and stored in the dark at 18 ℃ ~ 28 ℃, as a standard plate.
Note: The performance of some samples will change during storage. For similar alkyd paints that are still sensitive in dark places, they should be stored under agreed conditions.
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