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Availability:
In Stock.
Arrives
Thursday, Oct 8
Item Package Quantity: 1
Features
- Versatile All-Purpose Flux Ideal for use in plumbing, stained glass, electronics, HVAC, and general metalwork; delivers reliable, high-quality soldering results every time.
- Fast-Acting, Superior Wetting Rubyfluid's proven formula promotes rapid wetting and strong solder joints, reducing oxidation and ensuring clean, even flow on copper, brass, and other metals.
- Water-Soluble & Easy to Clean No harsh solvents neededsimply rinse with water after soldering for a residue-free, corrosion-free finish that protects your work long term.
- Trusted by Professionals Since 1903 Manufactured in the USA, Rubyfluid has been the go-to soldering flux for tradespeople, hobbyists, and artisans for over a century.
- 1 Pint Value Size Bottle Conveniently sized for workshops and professional use; the resealable container helps prevent spills and prolongs shelf life.
Description
RubyFluid Stainless Steel Flux is specifically formulated for soldering stainless steel.
Manufacturer: Ruby Chemical
Part Number: RUBYFLUIDPT
Item Weight: 1.33 pounds
Product Dimensions: 11 x 4 x 10 inches
Item model number: FLSRUBYFLUIDPT
Material: ruby
Item Package Quantity: 1
Included Components: 8 ounces of flus
Date First Available: April 4, 2004
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, Oct 8
This item is non-returnable:
Non-returnable. Transportation of this item is subject to hazardous materials regulation
View our full returns policy here.
Non-returnable. Transportation of this item is subject to hazardous materials regulation
View our full returns policy here.
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Top Amazon Reviews
I bought this specifically to tack solder some stainless steel 50-mesh filter screen together. I used 96% tin, 4% silver solder and it worked really well - good flow and wetting. I used both a 140W solder gun and a propane torch. The caveat is whatever heating method you use, you must get the joint plenty hot. The solder gun worked for a small area of about 1/4" diameter but it is difficult to get that to work on a larger area as the heat dissipates out of the joint too fast. The larger areas are better for a torch. Be sure to use plenty of flux and re-apply when hot too. It seems like this bottle will last a long time.
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Reviewed in the United States on June 23, 2026 by RRS
25+ years ago an older gentlemen who ran a professional sheet metal fabrication shop in our town said he would teach me how to solder using large soldering irons and a propane torch after hours one day-- I simply had to show up, keep my mouth shut, and do what he said--his company made anything one could dream of from metal--massive custom copper stove hoods, 10 feet tall stainless steel bird cages, to antique car hoods. Concerning Ruby Fluid flux he said, "Son, you can solder toilet paper to railroad iron using this stuff as long as you first get the surfaces clean, degreased, and then know how to neutralize the flux once you're done." He wasn't lying either. I soldered a lot of expensive sheet brass together back then on a personal project without incident using Ruby Fluid. The joints turned out very professional for a newbie. I am glad to find Ruby Fluid for sale here. It works like magic.
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Reviewed in the United States on June 8, 2021 by S.K.H
Great flux, a little goes a long way, my solder lines are smooth and fluid. Also noticed little to no smoke when soldering.
Reviewed in the United States on June 9, 2026 by Jeanette Muhlnickel
It works well for my projects.
Reviewed in the United States on December 23, 2025 by Maggie
I used this flux with 50/50 tin/lead soldering bars to repair a radiator on a fire truck, it was used to solder a brass filler neck to a steel reservoir. I did some experimenting prior to using it on the fire truck by soldering a brass ring to a piece of sheet metal with flux and without, let’s just say the flux did its job perfectly!
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Reviewed in the United States on February 6, 2026 by MDR
It works, but I now only use it for non-PCB applications, because I found out it conducts electricity between PCB pads. I had a sensitive electronic project that was due the next day, and it would not work. After some tinkering, I found the residue fluid was conducting on an amplifier circuit causing bad signals. Cleaned it with alcohol, and it started working! I think there should be note somewhere on the bottle about its conductivity. Now I use it for tinning wire leads in a solder pot, and it works well for that application.
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Reviewed in the United States on July 31, 2022 by Chris
Has much less smoke and smell when soldering. Also easier cleanup.
Reviewed in the United States on February 14, 2024 by bamafan4evr
A tiny amount goes a long way. I'm still on my first syringe of this flux and I probably won't have to buy another can for years. While larger cans of flux like this are targeted toward professional shops, it'll last a lifetime for a home shop. Make sure to clean up the remainder when you're finished, it is acidic and will corrode your circuits over time. I rarely give 5 stars for even items that perform as expected but this item does everything it claims, outperforms more expensive fluxes I've used, and well exceeds my expectations for the price.
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Reviewed in the United States on November 17, 2011 by Carp