Solder Paste – Flux Solder Paste for SMD & PCB Soldering
Flux Solder Paste for SMD & PCB Soldering
This rosin‑based flux solder paste delivers consistent wetting and strong adhesion for SMD components on printed circuit boards, ideal for Arduino, ESP32, Raspberry Pi, and general electronics prototyping.
Key Specifications
| Composition | Rosin‑based flux with Sn63/Pb37 solder alloy |
| Melting Point | Approximately 183°C (eutectic) |
| Viscosity | Medium, suitable for stencil printing and syringe dispensing |
| Flux Content | ~2.2% by weight |
| Package | 50 g sealed tub |
| Color | Translucent amber |
| Application | SMD soldering, PCB rework, through‑hole tacking |
| Shelf Life | 12 months when stored at 15‑25°C in original container |
What You Can Build With This
- LED Chaser Circuit: Solder a row of 10 LEDs and resistors on perfboard, controlled by an Arduino Uno for a classic blinking pattern.
- ESP32 Environmental Monitor: Assemble an SMD‑based BME280 sensor and OLED display on a custom PCB for real‑time temperature and humidity logging.
- Raspberry Pi Sensor HAT: Use the paste to mount SMD connectors, resistors, and an ADC chip onto a Pi‑compatible board for analog sensor input.
- CBSE Class 12 Transistor Amplifier: Soldering practice project — mount a BC547 transistor, capacitors, and resistors on a general‑purpose PCB as per the physics practical syllabus.
- B.Tech Final Year IoT Node: Fabricate a compact SMD‑based ESP32 module with Li‑Po charger and sensor interface for a Smart India Hackathon energy monitoring prototype.
Compatibility
| Platform | Compatible | Connection | Library / Method |
|---|---|---|---|
| Arduino Uno R3 | Yes | Solder header pins, SMD shield chips; no direct electrical link | Not applicable |
| Arduino Nano | Yes | Solder SMD parts or wires onto Nano carrier boards | Not applicable |
| Arduino Mega 2560 | Yes | Assembly of SMD‑based sensors and shield boards | Not applicable |
| ESP8266 NodeMCU | Yes | Used to solder SMD resistors/caps on breakout PCBs for NodeMCU | Not applicable |
| ESP32 Dev Board | Yes | Reflow soldering of SMD modules on custom ESP32 carrier PCBs | Not applicable |
| Raspberry Pi Pico | Yes | Solder header pins or SMD components on Pico‑based projects | Not applicable |
| Raspberry Pi 4 / 5 | Yes | Mount SMD ICs on Pi HATs; manual soldering of connectors | Not applicable |
Wiring and Interface Notes
Apply a small dab of solder paste onto clean PCB pads using the syringe tip or a stencil, then place the SMD component on top. Heat the joint with a soldering iron (300–350°C) or a hot‑air rework station until the paste flows and forms a shiny fillet. Tip: Clean the board with isopropyl alcohol before and after soldering to remove oxidation and residual flux for maximum joint strength.
Frequently Asked Questions
Is this solder paste lead‑free?
No, this paste contains a Sn63/Pb37 alloy and is not lead‑free. For ROHS‑compliant projects, a separate lead‑free solder paste is needed.
How should I store the paste to make it last longer?
Keep the tub tightly closed in a cool, dry drawer (ideally below 25°C). Refrigeration can extend shelf life, but let it warm to room temperature before opening to avoid moisture condensation.
Ask Soldr above what you can build with this — it knows every Compoden kit this part appears in.
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items