Solder Wicks and Desoldering Braids
Solder Wicks and Desoldering Braids: How They Work and Which to Choose
Desoldering braid — commonly called solder wick — is a pre-fluxed copper braid that removes solder from PCB joints through capillary action: the iron heats the wick and joint simultaneously, flux activates to improve wetting, and molten solder is drawn up into the braid. Choosing the right wick comes down to three variables: width matched to the pad size, flux type matched to your process chemistry (no-clean vs. rosin/RMA), and brand quality that ensures consistent flux loading and braid construction. The most common mistakes — pressing too hard, reusing spent wick, or using an oxidized tip — cause pad damage and poor solder removal that are often blamed on the wick itself. For a full overview of soldering equipment, solder wire, and rework tools, visit our Soldering, Desoldering & Rework hub.
Solder Wick Specifications & Selection Guide
| Attribute | Options | How to Choose |
|---|---|---|
| Width | Fine: 0.6–1.5 mm | Medium: 2–3 mm | Wide: 4–6 mm | Fine for SMT, fine-pitch ICs, 0402/0603 passives. Medium for general through-hole and mid-size SMT. Wide for large pads, ground planes, connector pins, and multi-pad bridges. Wick should match or slightly exceed pad width — oversized wick can pull solder from adjacent pads |
| Flux Type | No-Clean | Rosin (RMA) | No-clean: minimal residue, safe to leave on board; best for production environments. Rosin/RMA: more aggressive activation for stubborn joints and older solder; clean residue after use with flux remover. Match wick flux type to your solder paste chemistry |
| Iron Temperature | 315–370°C (600–700°F) for leaded; 350–400°C (660–750°F) for lead-free | Too low: solder won’t flow into braid. Too high: pad or component damage. Use the lowest temperature that achieves clean absorption in 2–4 seconds |
| Wick vs. Desoldering Pump | Wick: precision, fine-pitch, bridges | Pump: speed, through-hole, high solder volume | Use wick for SMT rework, fine-pitch cleanup, and small bridges. Use a desoldering pump for through-hole components and large joints where volume removal is the priority. Many technicians keep both on hand |
Frequently Asked Questions
How do I use solder wick correctly without lifting pads?
Lay the end of the braid flat against the solder joint, then press the soldering iron tip on top of the wick — not directly on the pad. Hold steady for 2–4 seconds until you see solder wick up into the braid, then remove the iron and wick together in one motion while the solder is still liquid. Never drag, scrub, or pull a cooled wick — a wick that has bonded to solidified solder will lift the pad when pulled. Apply only light pressure; capillary action does the work, not force. Always advance to a fresh section of wick for each joint — a saturated section loses effectiveness immediately.
What is the difference between no-clean and rosin solder wick?
No-clean wick uses a low-residue flux formulation that leaves minimal, electrically benign residue — safe to leave on the board in most applications and preferred in production environments where post-cleaning is not part of the process. Rosin (RMA) wick uses a more aggressive rosin-based flux that provides better activation on difficult joints, oxidized pads, or older solder, but leaves a residue that should be cleaned with an appropriate flux remover after use. Match your wick flux type to your solder paste and board cleaning process to avoid compatibility issues.
Why is my solder wick not absorbing solder?
The three most common causes are: an oxidized or poorly tinned iron tip (poor heat transfer is the #1 cause of wick failure), iron temperature too low for the solder alloy (lead-free requires higher temperature than leaded), or reusing a saturated section of wick that has no remaining absorption capacity. A fresh section of quality wick with a clean, tinned tip at the correct temperature should absorb solder within 2–4 seconds. If absorption takes longer, increase temperature in 10°C increments before assuming the wick is defective.
Which solder wick brand should I use?
Chemtronics Soder-Wick is the industry standard, available in no-clean and rosin flux across a full range of widths — trusted in aerospace and high-reliability applications. MG Chemicals offers reliable general-purpose wick at a competitive price point, well-suited for production environments. Techspray provides strong no-clean formulations for electronics manufacturing and field service. Easybraid offers specialty braids including ESD-safe options and high-flux formulations for difficult joints. All are available at MTE Solutions — contact our team if you need help matching wick to your specific process.
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