Is this this the correct sodder to use when working on circuit boards

I use it for wiring small switches on my model railway. It's fairly thin so doesn't take many seconds to melt. I would think it's OK for soldering components on a circuit board.

do you still need to use flux with this?

Hello dear friend, this does not need a flux, direct use of fire can be.

can i use this to repair a sterling silver ring?

I think the binding force on soldering is too weak for ring. This is usually for electronic components assembly.

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Solder Wire,0.8mm Soldering Wire Lead Free Sn99.3 Cu0.7 with Rosin Core for Electronic Electrical Soldering Components Repair and DIY. (20, Grams) Net 15g

Solder Wire,0.8mm Soldering Wire Lead Free Sn99.3 Cu0.7 with Rosin Core for Electronic Electrical Soldering Components Repair and DIY. (20, Grams) Net 15g

Product ID: 451212314

🔥Melting point 185-190°C

🧵0.8mm precision diameter

♻️Lead-free, eco-safe alloy

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Description

⚡ Solder smarter, not harder — precision and eco-friendly in every strand!

POCKET SIZED POWER - Compact 20g spool fits right in your toolkit or pocket for on-the-go fixes.
CLEAN BRIGHT JOINTS - Rosin core flux ensures smooth flow and shiny, reliable solder connections every time.
VERSATILE REPAIR CHAMP - Perfect for electronics, from smartphones to circuit boards—be the hero of your DIY squad.
FAST MELTING EFFICIENCY - Optimized melting range (185-190°C) speeds up your workflow without compromising quality.
ECO CONSCIOUS CRAFTSMANSHIP - Lead-free Sn99.3 Cu0.7 alloy keeps your projects safe and sustainable.

This 0.8mm lead-free solder wire features a high-purity Sn99.3 Cu0.7 alloy with a rosin core flux for superior electrical and thermal conductivity. Designed for professional and DIY electronic repairs, it melts efficiently at 185-190°C, delivering clean, strong joints without toxic lead. Compact and portable, it’s ideal for precise, eco-conscious soldering across a wide range of devices.

Specifications

Asin	B0B3D8NLMB
Batteries Required	No
Best Sellers Rank	18,488 in DIY & Tools (See Top 100 in DIY & Tools) 13 in Solder
Colour	20 G
Customer Reviews	4.4 4.4 out of 5 stars (1,855) 4.4 out of 5 stars
Date First Available	7 Jun. 2022
Guaranteed Software Updates Until	unknown
Included Components	solder wire
Item Model Number	SW003
Item Weight	20 g
Manufacturer	Sumwitum-UK
Package Dimensions	10.7 x 9.6 x 2.5 cm; 20 g
Part Number	SW003
Power Source	ac

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