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—lead-free precision for the modern maker!

COMPACT PORTABLE - Small 20g spool fits in your pocket—ready for on-the-go fixes
OPTIMAL MELTING RANGE - Melts cleanly at 185-190°C for smooth, efficient joints
ROSIN CORE FLUX POWER - Built-in flux boosts flow and adhesion—no extra cleaning needed
ECO FRIENDLY LEAD FREE - Sn99.3 Cu0.7 alloy ensures safe, sustainable repairs without toxic lead
PRECISION PERFECT DIAMETER - 0.8mm wire for flawless, detailed soldering every time

This 0.8mm lead-free solder wire features a high-purity Sn99.3 Cu0.7 alloy with a rosin core flux, melting cleanly between 185-190°C. Designed for professional-grade electronic repairs and DIY projects, it offers excellent electrical and thermal conductivity, minimal slag, and strong, bright joints. Its compact 20g spool makes it easy to carry and use anywhere, ensuring reliable, eco-conscious soldering every time.

Specifications

ASIN	B0B3D8NLMB
Batteries Required?	No
Best Sellers Rank	23,109 in DIY & Tools ( See Top 100 in DIY & Tools ) 18 in Solder
Colour	20 G
Customer Reviews	4.4 4.4 out of 5 stars (1,869)
Date First Available	7 Jun. 2022
Guaranteed software updates until	unknown
Included Components	solder wire
Item Weight	20 g
Item model number	SW003
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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