Product Description

Solder Paste

Solder paste is one type of solder that is sticky paste form in metallic grey color, mixed with alloy solder powder and flux. Solder paste is mainly used to assemble printed circuit boards (PCB) by connecting surface mount components (IC) to the pads on the PCB. It can hold the electronic components in place on the board before the soldering, and after it’s heated up the flux will be activated and the solder powder insides will melt and then well bond the components with the PCB. Solder paste are available in tin lead alloys & lead free alloys.

Basic Product Information of Solder Paste:

Alloy: Tin lead alloy: Sn63Pb37, Sn60Pb40, Sn50Pb50, Sn40Pb60 solder paste etc; Lead free alloy: Sn42Bi58, Sn96.5Ag3.0Cu0.5, Sn99Ag0.3Cu0.7 solder paste etc.

Powder size: Type 3 (25 to 45 microns); Type 4 (20 to 38 microns); or other powder size upon requests.

Flux: around 11.5%, no clean type.

Packing: Jar & Syringe.

Weight: 100g, 200g, 500g, 1000g per jar or other weights available upon requested.

Appearance: metallic grey color pasty form. 

Applications of Solder Paste:

Solder paste generally is used in SMT soldering projects, it’s applied onto printed circuit board (PCB) through a stencil printing process. Stencil is generally a stainless steel that is cut and perforated with desired pattern which will allow the solder paste to be applied on the pads precisely & with accurate amount of paste. Alternative ways to apply solder paste will be jet printing through nozzles or applied manually by using syringe packing. After that the PCB will be heat up (reflow soldering) so that the solder paste will melt to connect the electronics components with the pads.

Using & Storage of Solder Paste:

1. Solder paste should be stored in refrigerator at temperature between 0 to 10℃ to have longer shelf life.

2. Solder paste should be taken out of refrigerator 3 to 6 hours prior to use so that it has enough time to turn to room temperature and function properly.

3. In case there’s still leftover paste after use, it must be tightly sealed and refrigerated. Before re-using, it’s a must to double check if the solder pastes hasn’t become separated or thicken to its usual state.

4. Read TDS of each type of solder paste before using.