QJ305 Pasty Silver-Based brazing flux produced by our factory was certified by relevant experts of Shanghai in March 14, 1991. Then, it was reported and introduced specially by some journalists such as Xin Min Evening Daily, Shanghai Vacuum Journal, Shanghai Science & Technology Daily, Heating and Ventilating Technology of Air Conditioners and Welding Research and Production, and won "recognition award" in " 92 New Technology and New Products Trade Fair of Nationwide Individually-Run Enterprises" held by State Commission of Science and Technology. With a strong removal film capability, this product can improve brazed base metals? wetTability and permeability and maintain its activation within 550～850°C. It can be applied to several brazing methods covering torch brazing, resistance brazing, induction brazing, high frequency brazing, furnace brazing and salt-bath immersion brazing, etc. Moreover, it can work together with silver-based brazing filler metals, copper-based brazing filler metals, copper-phosphorus-based brazing filler metals, brazing copper, copper alloys, steel, stainless steel and hard alloys, etc, offering a stable performance, good overflowing property and clean-cut appearance of brazing joint. Therefore, it features convenient application and repeatability without agglomeration for a long storage life. With more advantages than powder brazing flux, this kind of brazing flux can become a perfect alternative to foreign similar products.