What is the purpose of adding powder to make tin paste?

Tin paste is one of the indispensable materials of the solder industry patch, tin paste is divided into lead-free tin paste and lead tin paste, leadless tin paste has high temperature tin paste and low temperature tin paste.

We know that the alloy and melting point of tin paste is different.

First of all can be analyzed from the tin paste alloy. First, low-temperature tin paste as the name implies a relatively low melting point, the main component is composed of Bismuth and Tin, tin paste temperature will drop its melting point 138 degrees C after add Bismuth Powder. Tin paste is is suitable for those components or PCB that cannot withstand high temperatures, low temperature paste welding is relatively poor, solder joints are brittle, and gloss is dim.

Second, high temperature tin paste in the furnace on the temperature requirements are higher, the melting point is higher than SN / BI paste, the main component is composed of tin, silver copper, melting point is range from 217 degrees C -227 degrees C.

A low-temperature leadless paste, in which the tin content of 42%, Bismuth powder content reached 58%, the melting point of this tin paste is 138 degrees Celsius, suitable for the high requirements of reflow-soldering process. This tin paste is suitable for welding led circuit boards with some low temperature electrical devices, which are superior in wetting and welding performance.

In tin silver, the tin content is 64%, the content of bismuth powder is 35%, the silver content is 1%, the melting point is 180 degrees, the operating temperature is 200 to 220 degrees  (Time120 to 180Sec); Widely used in CPU heat sinks and heat sinks.

Changsha SANTECH produce high purity Bismuth powder by atomization equipment to get 100, 200 325 mesh Bismuth powder, widely used in tin paste, radiation-proof coating and other materials. #Bismuth Powder# Pure Bismuth Powder#325mesh Bi Powder#200mesh Bismuth Metal Powder

Product recommendation : Bismuth

Changsha SANTECH provides Bismuth Metal Ingot, Pure Bismuth Granules, High Purity Bismuth Needle, Bismuth Metal Powder, Bismuth Trioxide Powder, etc. Please email us if you are interested in our products. Thank you!