WATER SOLUBLE FLUX PEN - 837-P

Name: WATER SOLUBLE FLUX PEN - 837-P
Brand: LED MONTREAL
SKU: FLUX
Price: 17.97 CAD
Availability: InStock

SKU: FLUX

Brand: LED MONTREAL

If you have ever tried to solder an LED strip to a lead wire and watched the solder ball up instead of flowing, this little pen is the fix. The Water Soluble Flux Pen (837-P) from LED MONTREAL — also called a solder flux pen, soldering flux marker or flux applicator pen — puts a clean, controlled dose of water-soluble soldering flux exactly where you need it. Instead of dipping, brushing or squeezing messy flux onto a board, you press the chisel tip to the copper pad, brush it on, and solder. It's made for the prototyping, rework and repair of both conventional and surface mount circuit boards, and it's just as handy on the bench as it is up a ladder finishing a run of indoor LED strip lights.

The flux inside the 837-P has a neutral pH at room temperature and becomes highly activated at soldering temperatures, so it does its job the moment your iron touches down and stays inert the rest of the time. It works with both leaded and lead-free solders, meets IPC J-STD-004B and type ORH1, and is rosin/resin free, halogen-free and RoHS compliant — a cleaner chemistry to work with on delicate LED boards and small electronics. Post-soldering residues do need to be cleaned, but that's the beauty of a water-soluble formula: plain water removes them, no special solvent required. The chiseled felt tip lets you lay flux on a single pad without flooding the neighbours, and each pen holds a net volume of 10 mL (0.33 fl oz) with a net weight of 8.46 g (0.29 oz). Using it is simple: depress the tip against a hard surface until the felt gets wet but is not flooding, then gently brush the wet tip over the soldering area, pressing the tip in only as needed to control the flow.

This is a shop-drawer essential for anyone who cuts, joins and customizes LED light strips — homeowners running strips under kitchen cabinets, contractors building continuous runs in coves and ceilings, sign makers, hobbyists and small electronics repair shops across Canada. Use it whenever you're tinning strip pads, soldering extension wires, repairing a broken segment, or reworking a driver or control board. It suits both residential and commercial projects. Order the 837-P flux pen (SKU: FLUX) and keep your solder joints bright, fast and reliable.

What's in the pen
The 837-P is a pen-style applicator filled with a water-soluble soldering flux. The chemistry is deliberately mild while you work: the flux carries a neutral pH at room temperature and only becomes highly activated once it reaches soldering temperatures. That means it isn't aggressively attacking your pads while the pen sits on the bench, but it strips oxides and lets solder wet the copper the instant heat arrives. It is rosin/resin free and halogen-free, so it leaves behind no sticky amber crust to chase around a board, and it is RoHS compliant.

Technical specifications
Model: 837-P
SKU: FLUX
Brand: LED MONTREAL
Type: water-soluble soldering flux pen
Standard: meets IPC J-STD-004B, type ORH1
Solder compatibility: leaded and lead-free solders
Composition: rosin/resin free, halogen-free, RoHS compliant
Tip: chiseled felt tip for precise application
Net volume: 10 mL (0.33 fl oz)
Net weight: 8.46 g (0.29 oz)

How to use it properly
Start by depressing the tip against a hard surface until the felt tip gets wet, but not flooding — that priming step is what keeps the pen from dumping flux on your first pad. Then gently brush the wet tip onto the soldering area to apply. To keep the tip saturated and control the flow, only press the tip in as needed. Because it's a chisel tip flux pen, you can lay a thin line along a row of SMT pads or drop a precise dab on a single LED strip solder pad without wicking flux under nearby components. One important habit: post-soldering flux residues must be cleaned. They come off easily with water, but don't skip the step — water-soluble residues are meant to be washed away, not left on the assembly.

Where it earns its keep
The 837-P is designed for prototyping, rework and repair on both conventional through-hole and surface mount circuit boards. In a lighting context, that covers almost everything you do by hand: tinning the copper pads of a cut LED tape before soldering lead wires, joining two strip segments around a corner instead of using a connector, repairing a strip that lost a section, re-soldering a loose wire at a driver terminal, or fixing a controller board. Sign shops, AV integrators, cabinet makers, prop builders and repair benches all reach for the same pen. It suits residential renovations as much as commercial fit-outs, and it's small enough to live in a tool pouch on site.

Good to know before you solder
For clean LED strip joints, use a fine chisel or conical iron tip, pre-tin both the strip pad and the wire, apply flux with the 837-P, then bring the two together with a quick touch of heat — long dwell times are what lift pads and cook LEDs, not the flux. Keep the pen capped between uses so the felt stays saturated. Since the flux works with leaded and lead-free solder, you can use the same pen across an older repair and a new RoHS build without swapping products. There is no separate spec sheet or IES file for this item in the Documentation tab; the product information and application instructions above are everything you need to get going.