How can I test the acid value of the flux? What criteria do you use? Which agency does it go to?
Although you do not know where to test, but you can choose neutral flux, so that there is no need to worry about corrosion problems.
If you understand chemistry, you can use the titration method to calculate, and if not, you go to Guangzhou five to test, which can be done, including standards, they are all very.
Scaling powder！！ Is it for cast welding machines? I don't know how to test this, but I know this can cut the skin off your fingers. This stuff is very corrosive
