ISO 8130-6-2021 pdf download.Coating powders – Part 6: Determination of gel time of thermosetting coating powders at a given temperature. 6.5 StIrrer, of very low heat capacity and of suitable size. A stirring needle with a round pinhead, diameter 1 mm, and attached to an insulating handle may be used. NOTE A wooden stirrer has also been found to be satisfactory. 6.6 Scraper, made of a material softer than that of the heating block, for removing the test material from the heating block without scratching its surface. 7 Sampling Take a representative sample of the product to be tested as described In ISO 15528. 8 Procedure The gel time determined by this method is not directly related to the time for a coating powder to cure in practical applications. Carry out the test at (180 ± 1) °C unless otherwise specified or agreed between the interested parties. Place the heating block (1) in a draught free environment. Raise the temperature of the heating block to the specified temperature and allow it to stabilize for at least 10 mm. Check that the surface temperature of the heating block has reached the required temperature. A small portion of suitable material (5.1) that melts at the required temperature may be used. NOTE A calibrated surface contact thermometer can also be used to verify the temperature in the depression. By means of the measuring spoon (f..3), transfer a test portion of 0,25 ml of the product into the depression in the heating block and, unless otherwise agreed or specified, start the timer (6A) immediately after all the powder has melted and commence stirring the material. Stir the molten material in small circular movements with the stirrer (5). Upon an Increase of viscosity, maintain the overall stirring action, then lift the stirring device every 2 s to 3 s to about 10 mm away from the molten material. When the threads thus formed become brittle, such that they break and can no longer be drawn from the molten material, stop the timer. Record the time to the nearest 1 s. This is the gel time. Immediately scrape the test material from the heating block, using the scraper () and taking care not to damage the surface. 9 Precision Precision data are currently not available.ISO 8130-6 pdf download.
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