Chip Quik SMD291AX Solder Paste no clean 63Sn/37Pb in 5cc syringe 15g

La pâte est précise et fonctionne à merveille... ce n'est pas un produit pour débutant car si mal appliqué ou en trop grosse quantité, ça peut créé un court-circuit... pas assez, la soudure ne tiendra pas. Somme toute, excellent produit, je recommande.

Not going to pretend this is a discovery — Chip Quik SMD291AX has a reputation in the hobby electronics community for a reason and that reputation is earned. Been running this through a stencil on leaded paste reflow work for a limited board run and the results have been consistently clean across the whole batch. Paste consistency is exactly where it needs to be. Extrudes smoothly through a stencil without bridging on fine pitch pads, holds its shape between application and reflow without slumping, and the tack is strong enough that components stay put through handling without shifting before heat is applied. These sound like baseline requirements but cheaper pastes fail at least one of them reliably. 63/37 eutectic alloy means a sharp liquidus transition at 183°C with no plastic phase — you get a clean reflow without having to babysit the thermal profile as carefully as you do with non-eutectic alloys. The joints come out shiny and well formed consistently. No clean flux residue lives up to its name. Left the boards as-is after reflow and the residue is minimal, non-corrosive, and doesn't cause any issues with continuity or appearance. When I do clean it IPA takes it off without any effort. 5cc syringe format is practical for stencil work and hand application on rework. Keep it refrigerated between sessions and it stays workable for a long time without drying out or separating. If you're doing any volume of SMD assembly and still experimenting with paste brands stop experimenting. This is the one.

This paste contains lead, but sometimes it's a necessary evil in order to get decent solder joints. Just be careful when using it- wear gloves, clean up afterwards and perhaps even wear a face mask to prevent breathing in the fumes.

Heats up and flows more or less as expected, with the odd bit of solder flying off. Make sure to clean up with isopropyl alcohol after use.

I've been able to use the same syringe of this flux for years, storing it in the refrigerator. I've had better results with this flux than others when stenciling. The solder seems to reflow more easily and the components stay put when using a hot air iron at low air velocity. Throw it in the refrigerator for a bit, or it will tend to stencil into small puddles instead of well-formed shapes. In my opinion, it's the best.