Relife RL-441 Solder Wire - 0.3mm Fine Diameter (35g Spool) High Activity

Specifications

• Brand: Relife

• Model: RL-441

• Diameter: 0.3mm (Ultra Fine)

• Weight: ~35g (Small Spool)

• Composition: Leaded Alloy (Standard Repair Grade)

• Flux Content: Rosin Core (No-clean type)

• Melting Point: Low Temperature (Easy to melt)

• Spool Size: Compact Handheld

Key Applications

• Mobile Repair: Soldering FPC connectors, charging ICs, and 0201 components.

• Jumper Wires: Tinning thin enameled copper wire (0.01mm/0.02mm) for trace repair.

• SMD Rework: Touching up QFP/QFN legs under a microscope.

Virtual Technician: Usage Tips ⚠️

• Too Thin for Thru-Hole: Do not use this 0.3mm wire for soldering large connectors or XT60 plugs. You will have to feed meters of wire to fill the joint! Use 0.8mm wire for that. This is strictly for SMD/Micro work.

• Lead Safety: This product contains Lead (Pb). Always wash your hands after use and solder in a ventilated area. Do not breathe the fumes.

• Feeding: 0.3mm wire is very flexible. Hold the iron close to the pad to prevent the wire from bending away before it melts.

Accessories

• Included:

  • 1 x Relife RL-441 Solder Wire Spool (0.3mm)

• Recommended (Sold Separately):

  • Micro-Soldering Iron Tip (I, IS, or J shape)

  • Fume Extractor

Frequently Asked Questions (FAQ)

1. Is 0.3mm too thin?

   • For standard DIP components, yes. For mobile repair/SMD, it is perfect.

2. Is it lead-free?

   • No, RL-441 is typically Leaded solder. This makes it easier to work with (lower melting point, shinier joints) but requires ventilation.

3. Does it have flux inside?

   • Yes, it has a Rosin flux core.

4. What is the alloy ratio?

   • It is a Leaded alloy. (Note: Specific ratio varies by batch, but behaves like standard repair solder).

5. Can I use it for plumbing?

   • No! It is for electronics only.

6. Does the spool weigh 35g?

   • The total package is approx 35g. The actual wire weight is optimized for handheld use.

7. Is it good for drag soldering?

   • Yes, the fine gauge allows precise drag soldering on IC legs.

8. Will it fit on a standard holder?

   • The spool is quite small (handheld size), so it might not fit on large 1kg stand spindles.

9. Does it expire?

   • Flux can dry out over many years, but solder wire generally lasts decades.

10. Is Relife a good brand?

    • Yes, Relife is a sub-brand of Sunshine, very popular in the professional repair community.

       

11. Can I use it on gold pads?

    • Yes, it works fine on ENIG (Gold) finishes.

12. What temperature should I set my iron?

    • For leaded solder, 350°C is usually sufficient.

13. Is it brittle?

    • No, the wire is soft and pliable.

14. Does it leave residue?

    • It leaves a small amount of yellow rosin residue which is non-conductive but can be cleaned with IPA.

15. Can I mix it with lead-free solder?

    • It's not recommended to mix alloys as it creates brittle joints, but for repair, it's often done.

16. Why is it more expensive per gram than 1mm wire?

    • Drawing wire down to 0.3mm is a more expensive manufacturing process.

17. Is it shiny?

    • Yes, leaded solder dries to a bright, shiny finish (unlike dull lead-free solder).

18. Can I eat with it?

    • NO. It contains lead. Keep away from food and children.

19. Does it spark?

    • No.

20. Is it magnetic?

    • No.