1, safety capacitors include various capacitors. Functionally, such as x capacitance and y capacitance. In terms of materials, it can be divided into ceramic capacitors, thin film capacitors and so on. So some manufacturers only make one material.
2. For example, at present, ceramic safety capacitors are called jec, Xuzhi Electronics and capacitors imported from Taiwan Province Province.
Personally recommend Dongguan Xuzhi Electronics, you can go and have a look.
You can search the network by looking at the capacitor you want, and you should get more information.