How should lead-free solder paste be stored under normal circumstances?

In the general electronics industry or small and medium-sized enterprises, the usage of this product is usually not large, but its uses are numerous. Many of them are not used up during the process. How do people solve this situation? They either throw it away or make use of it. Nowadays, the usage of this product by malicious enterprises is also increasing. Have you ever learned about this? Now, JJY solder Paste Manufacturer will tell you about itLead-free solder pasteHow should it be stored in general?

1Generally, in our work, whether leaded or lead-free solder paste must be stored in2-10℃In terms of environmental protection, it is conducive to maintaining its quality stability. However, if it is left at room temperature for a long time without special solder paste, it is prone to drying out and oxidation. Do not expose it to direct sunlight.

2It must be used in advance3-4Take it out and place it at room temperature25-28℃Warm up, then open the lid and stir for use. Do not open the lid to warm up or heat to accelerate the warming up (such consequences may cause parts to fly during reflow soldering).

3After opening the lid, it must be thoroughly stirred by hand5About a minute, machine3About minutes (depending on the machine)

4The unused solder paste after work on the same day must be collected into an empty bottle and not stored together with unopened solder paste. It is recommended to store it after opening the cap24Use it up within hours

5Depending on the production situation, if the amount used is not large, it is prohibited to pour the entire bottle of solder paste onto the steel mesh at one time for brushing. Instead, it should be added in small amounts and multiple times

6The solder paste printing is completedPCBSuggestions after Posting8The reflow soldering should be completed within an hour. If it is the rainy season, it should be brushed and passed through the oven immediately (to avoid adverse conditions such as solder paste oxidation, solder beads, and solder explosion caused by prolonged time).

7.To achieve a good welding effect, it is recommended that the indoor working temperature be controlled at28℃Left and right, humidityRH40-60%

8It is recommended to clean the residual solder paste on the steel wire mesh after work with board cleaning water. If there is solder paste on the skin, please wash it clean when you get off work

To sum up, what the editor wants to tell everyone is that if you encounter stiffness or other conditions when using this product, be sure to pay attention. Do not stir it randomly. First, remove the hard skin and hard lumps. This will be beneficial for our subsequent work. If during the experiment, you can compare the situations and the effect is relatively good, then you can use it. If the effect is not very good, you should be willing to scrap it. Only in this way can the product have a good welding effect. Today, I will explain these situations to everyone. Please take a look. If you still have any questions, welcome to consult!