Copper based filler metal can be divided into four categories: high copper alloy, copper zinc alloy, copper phosphorus alloy and special copper alloy.

Copper zinc alloy filler metal is mainly used for gas flame brazing, high frequency brazing, salt bath immersion brazing, brazing copper, copper alloy, nickel, steel, cast iron, hard alloy, etc.

Cu-P alloy filler metal is based on Cu-P binary alloy and has good fluidity. It is mainly used for brazing copper and copper alloy.Because of high phosphorus content, it can not be used for brazing steel, nickel and its alloy. The wett bility of brazing filler metal will be greatly improved by adding silver into copper phosphorus alloy.

Brand	Equivalent to foreign brand	Composition（%）			Melting temperature (℃)	Application	Technical document
		Cu	Ag	P
XR-CuAg2	CN/GB：BCu91PA US/AWS：BCuP-6 JP/JIS：BCuP-6	Balance	1.8-2.2	6.8-7.2	643-788	Has good fluidity and is suitable for medium gap joints. It should be heated quickly, mainly suitable for "copper and copper" joints on refrigerators and air conditioners	MSDS
XR-CuAg5	CN/GB：BCu88PAg US/AWS：BCuP-7 JP/JIS：BCuP-3	Balance	4.8-5.2	6.5-7.0	643-771	The ductility and conductivity are improved, the fluidity is good. Suitable for large gap joints, and the heating should be accelerated	MSDS
XR-CuAg15	CN/GB：BCu80PAg US/AWS：BCuP-5 JP/JIS：BCuP-5	Balance	14.5-15.5	4.8-5.2	645-800	The ductility and conductivity are further improved. In the fluidity, it is suitable for large gap joints, and the joint toughness is good	MSDS