Why Are Solid MIG Welding Wire Spools Packaged Using Plastic Shrink Film, While Flux-cored Wires Require Vacuum Aluminum Foil Packaging?

Why Are Solid MIG Welding Wire Spools Packaged Using Plastic Shrink Film, While Flux-cored Wires Require Vacuum Aluminum Foil Packaging?

Solid wires（Copper coated welding wire,Aluminum welding wire,stainless welding wire） are simple metal alloys. 

Their main enemy is surface rust. Plastic shrink film provides an effective, low-cost moisture barrier that's perfect for storage and transport.

Flux-cored welding wire contains special powder inside!

This powder is hygroscopic – meaning it actively absorbs moisture from the air. If it gets wet, you'll get porous, weak welds with lots of defects.

That's why they need maximum protection! The aluminum foil creates a perfect barrier against air and moisture, while vacuum sealing removes any humid air trapped inside. This dual protection ensures the flux powder stays completely dry.

Solid Wire = Basic moisture protection (plastic is sufficient! )

Flux-Cored Welding Wire = Maximum defense against air & moisture (vacuum + aluminum foil is essential! )

We are a professional manufacturer of welding materials with 15 years of experience.

Our products include solid welding wire, flux-cored welding wire, aluminum welding wire, stainless steel welding wires, and welding electrodes.

For more information and more demand, let's talk together.

you can also send email to: sales@szewelding.com for consult, waiting for your message.