Essmetuin RMA799 Soldering Kit Sn42/Bi58 Paste 30g Flux 10cc Wick

Low-temperature soldering kit

The Essmetuin RMA799 kit bundles Sn42/Bi58 solder paste with a 138 °C melting point, a 10 cc no-clean flux and desoldering wick. It targets technicians who rework SMD and SMT components on heat-sensitive boards such as paper-phenolic or flexible substrates. The low peak temperature reduces the risk of board damage during component removal and replacement. All three consumables are lead-free and halogen-free.

Repair technicians on delicate boards

This kit suits engineers and hobbyists who regularly desolder and replace small parts on low-temperature substrates. The included wick leaves minimal residue, cutting clean-up time after rework. Buyers who need high-temperature alloys for power electronics or automotive modules should look elsewhere, as the Sn42/Bi58 composition is formulated specifically for 138 °C peak profiles.

138 °C melting point alloy

The Sn42/Bi58 paste melts at 138 °C (280.4 °F), a figure that dictates whether the kit matches the thermal budget of the assembly. If the board or components cannot survive standard SAC reflow temperatures, this alloy enables rework without substrate degradation. Verify the 138 °C limit against the board specification before purchasing.