Can it be used on brass

It is ok to use this solder for the brass, But this solder is very fine, the diameter is 0.01 in / 0.3mm solder wire, If you soldering a big brass, you should use larger solder wire, such as 1.0mm or 1.5mm solder wire

does this can be used to solder aluminium wires ?

Yes, this fine electrical solder wire can be used to soldering the aluminum wires, The solder wire diameter is 0.01inch / 0.3mm, very thin solder wire, It is mainly for electronics soldering for components or wires

Can this be coiled around toothpicks without straightening back?

Yes. It will probably relax some.

Can I use this with soldering iron to repair keychain?

This is super thin that is ideal for working of soldering on motherboards. May need to find a larger size solder wire.

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⚡ Solder Smarter, Not Harder — The Ultra-Thin Wire That Powers Precision!

PREMIUM LEAD FREE ALLOY - Sn99 Ag0.3 Cu0.7 composition ensures superior conductivity and reliable joints without toxic lead.
RAPID MELTING EFFORTLESS FLOW - Melts quickly at 419°F, compatible with all soldering tools for faster project completion.
VERSATILE FOR ELECTRONICS DIY - Perfect for fine electronics repair, manufacturing, and hobbyist projects—your go-to solder wire.
PINPOINT PRECISION FOR TINY SMD PADS - Ultra-thin 0.01in diameter wire designed for flawless micro soldering.
ROSIN CORE FLUX 2 5 FOR CLEAN JOINTS - Integrated flux improves flow and reduces rework, saving you time and labor costs.

This 50g spool of ultra-thin 0.01in (0.3mm) lead-free solder wire features a high-performance Sn99 Ag0.3 Cu0.7 alloy with 2.5% rosin core flux. Melting at a low 419°F, it delivers fast, clean, and precise soldering ideal for tiny SMD pads and fine electronics work, making it essential for professionals and DIY enthusiasts aiming for flawless connections.

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Manufacturer	Enersystec Electric Co.,Ltd
Part Number	EST-SW35-0.3LDF50
Item Weight	1.76 ounces
Product Dimensions	1.1 x 1.1 x 2.17 inches
Item model number	EST-SW35-0.3LDF50
Size	Thin Gauge
Color	Silver
Material	lead
Power Source	ac
Item Package Quantity	1
Special Features	1. Ultra-thin 0.01inch diameter, Rosin Core, Flux 2.5%, Flow well, Lead Free Solder Wire
Included Components	0.3mm solder wire LeadFree
Batteries Included?	No
Batteries Required?	No

Ultra-Thin Solder Wire 0.01in 0.3mm Rosin Core Flux 2.5, Lead Free Solder Wire Sn99 Ag0.3 Cu0.7 Flow 50g Electronics Soldering Electric Solder

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