The principle of the seam yellowing

The principle of the seam yellowing

for light color fastens the seam, the seam started yellowing is beautiful seam surface yellowing phenomenon. But if it is the beauty of brunet department seam, the seam surface may not be yellowing, but on the surface of white or transparent. Seam beauty products these changes will occur, mostly by the sewing products advocate material & ndash; — The influence of epoxy resin.

chemicals such as resin, epoxy resin under the conditions of purification is colorless transparent. Yellowing epoxy resin while naturally, but normal yellowing period of dozens of years or even longer. And if by direct sunlight for a long time, part of trace elements in the air is attached to the higher temperature of the surface of the epoxy resin, will produce a response, increase the yellowing epoxy resin. In addition, if there is water in the ceramic tile aperture, long wet gap will make epoxy resin gradually eroded by water vapor, moisture evaporate into epoxy resin by outsiders, residual impurities in the water vapor will also stay in the epoxy resin, produce the phenomenon such as white, color changing.