What is the mimimum paste layer thickness on tubes to achieve a good joint?
The normal thickness of the dry paste film is about 0.100 mm, which is about equal to the maximum diameter of the metallic brazing powder particles. The coating is better characterized and measured by weighing than by thickness. The recommended quantity is typically 150 to 250 g/m2 of tube surface area. The better tolerances on tubes and fins, the smaller amount paste is required.
