Sodering Paste

🔧 Soldering Paste (also known as solder paste) is a semi-solid material used in electronics to temporarily hold components in place and create strong electrical connections when soldering — especially in surface-mount technology (SMT).

🧪 What Is It Made Of?

• Tiny solder particles (usually a tin-lead alloy or lead-free alternative)
• Mixed with flux (a chemical that cleans and prepares metal surfaces for soldering)

🛠️ Main Uses:

• SMT soldering (especially with reflow ovens or hot air guns)
• PCB repair and rework
• Creating clean, low-resistance joints
• Helping solder flow evenly during heat application

🔥 How to Use It:

1. Apply paste to pads on a PCB using a syringe, stencil, or toothpick.
2. Place components on top — paste holds them in place.
3. Heat with hot air gun or reflow oven until solder melts and forms joints.
4. Allow to cool — components are now electrically and mechanically bonded.

📦 Common Types:

Type	Description
Sn63/Pb37	Traditional 63% tin, 37% lead (low melting point, ~183°C)
Lead-Free (RoHS)	Common mix: Sn96.5/Ag3.0/Cu0.5 (~217–220°C)
No-Clean Paste	Leaves minimal residue — no cleaning needed
Water-soluble	Easier cleanup with water, but must be cleaned

⚠️ Tips & Warnings:

• Store in a cool place (even fridge!) to extend shelf life
• Avoid skin contact — contains chemicals
• Don’t use expired paste — it may not flow or bond well
• Clean PCB before use for best results