The recommended method for mixing solder paste is manual stirring with a spatula. Avoid using centrifuge machines.
Here's a breakdown of the process:
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Allow to Reach Room Temperature: If the solder paste has been refrigerated (as is typical), let it sit at room temperature (19-25 degrees Celsius or 66-77 degrees Fahrenheit) for 4 to 8 hours before use. This step is crucial for proper consistency.
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Manual Stirring: Use a spatula to manually stir the solder paste. This ensures homogeneity, meaning the flux and solder particles are evenly distributed.
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Stirring Duration: Stir the paste for approximately one minute. Aim for a smooth, consistent texture. The goal is to achieve proper rolling characteristics when the paste is applied.
Why Manual Stirring is Preferred:
- Gentle Mixing: Manual stirring provides a gentle mixing action, preventing damage to the solder particles or separation of the flux.
- Control: You have precise control over the mixing process, allowing you to assess the paste's consistency visually.
- Homogeneity: It ensures a uniform distribution of flux and solder particles, which is essential for reliable soldering.
Why Avoid Centrifuges:
While centrifuges might seem like a quick solution, they can introduce issues:
- Separation: The high-speed spinning can cause the solder particles and flux to separate, leading to inconsistent solder joints.
- Damage: It can potentially damage the solder particles or alter the properties of the flux.
Summary:
To properly mix solder paste, let it reach room temperature and then manually stir it with a spatula for about one minute to ensure a homogeneous mixture. Avoid using a centrifuge machine.
