How to distinguish the quality of epoxy plate

Epoxy board is a kind of laminated board, mainly made of epoxy resin adhesive and paper, cotton and other substrate.
There are many types of epoxy plate, including 3240 epoxy plate, G11 epoxy plate, G10 epoxy plate, fr-4 epoxy plate, etc. Their performance is similar with some differences in details.
Now epoxy board can be said to be an indispensable part of electronic products, it can be used to do the splint of the mold, insulation components in electronic products, and some special epoxy board can also be processed into light, thin mobile phone leather case.
Because it is a very important component, so there are inevitably some defective products on the market, so how to look at the quality of epoxy plate?
The first thing to look at is the appearance of the epoxy board. The surface of the epoxy board should be smooth and smooth. Any dents, scratches or other marks are defective.
Also, the crosscut sides should be neat, and some rough edges will have burrs and pricks.
Epoxy plates are colored, including aqua, yellow, black, white, etc.
The epoxy plate should look uniform and full in color.
The strength of the epoxy plate is high and the toughness is good. When testing the performance of the epoxy plate, you can try to bend it or make it stressed.
The epoxy plate is waterproof and resistant to chemical corrosion, and can work normally in humid environment.
So this can also be used to test its performance.
As insulation material, insulation performance must be good, not conductive, even in the harsh environment is the same.
 
Look at the quality of the epoxy plate is basically to see the time above, if the appearance is beautiful, physical and chemical properties are good is good quality.
Many of the poor quality epoxy plates can be seen from the outside.
In the mixed market, need what product, oneself also want to learn the relevant knowledge, such ability won't be cheated by others.