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🔥 Master the melt with flawless flux finesse! ⚙️
Borax Flux Cone 4oz by RJS is a compact, easy-to-use flux designed for glazing crucibles and soldering. Activated with just a few drops of distilled water, it forms a milky paste that effectively deoxidizes metal during melting, ensuring clean, professional results every time.














| Manufacturer | RJS |
| Part Number | 1 |
| Item Weight | 4.6 ounces |
| Package Dimensions | 5.83 x 4.61 x 3.5 inches |
| Item model number | 1 |
| Material | Other |
| Item Package Quantity | 1 |
| Batteries Included? | No |
| Batteries Required? | No |
L**A
Came within HOURS of ordering
This is a smaller cone then I assumed it would be, these are known to last ages though so not concerned. It worked as expected. The best part of the order was that I ordered this item around 3in the morning and it arrived later that afternoon around 3pm I believe. That's insanity! So very fast! Not the 1st time Amazon has pulled off this crazy stunt. Makes me kinda worry their employees aren't getting over worked.... Sure hope not. I bet it's just they have gotten so good at what they do now and hubs/warehouses all over. I live in Portland Oregon so pretty big city known for its Tech Savvy-ness and tech inclined residents so makes sense to have a warehouse near my local stocked with things to makes insanely quick delivery times like this... At least I HOPE that's the case hah. Anyways, totally awesome and totally good item.
R**L
Must have for bench jewelers
Borax cones used for flux in Jewelry making not really easy to find in the US normally found in Europe with high shipping costs. Very nice to have access to them in the United States. Has bench jewelers use this every day.
L**K
I Am Sold!
I read about this product on a facebook group for metalsmiths. Someone said it was the best so I decided to try it out. WOW! I can't believe how much my soldering results have changed for the better.
L**.
The best for jewelry
This borax cone solved all my soldering issues when making copper jewelry. Solder flows nicely and faster. Definitely recommend it.
M**K
Wanted to try it seen u tube video
Tried it , works looks like it's going to last a long time, bought a glass coster for a dollar from goodwill and scored the inside with a diamond wheel makes a good past or slurry, the only down fall I'm afraid I'm going to knock it off work bench and break the cone
M**L
Perfect
Exactly as described and works perfect for me
D**M
Just as expected!
Works great! Came carefully package to ensure it doesn’t break
A**.
Most likely operator error
Since this is the first time I have purchased this item and used it, I can't lay all blame on the item itself, but on me. I cannot seem to get it to produce the 'slurry' that is shown on videos I have watched for instructions. I tried it repeatedly but feel this was not my best purchase. I feel sure that in the future I will attempt to try it again and again, hoping for better results. I actually do better with plain Borax , slowly mixing in the water.
A**R
Substandard product
The borax cone I received was made in India. The wuslity is not as good as the ones I usually buy from UK. I purchased in August, didn’t open the product until until mid October. The cone was sealed inside plastic, surrounded by the paper wrapped & inside a box. However when first opened the plastic wrapper the borax cone had obvious moisture inside the wrapper & the cone had moisture bubbles on it. Not happy as it will disintegrate very quickly.
Trustpilot
2 weeks ago
4 days ago