Product Overview

Kester OR-421 is more heat stable, exhibits better wetting capabilities and has less odor than competitive products. The residues left by OR-421 are near neutral pH and therefore also less corrosive. Classified as ORH1 per J-STD-004, this cored solder wire can be utilized with an open torch or a soldering iron.

Kester OR-421 will solder copper as well as more difficult to solder materials such as brass and nickel.  This wire can be used on pipes or tubing for applications such as refrigeration coils and heat exchangers. The heat stability of Kester OR-421 makes it ideal for high temperature alloys such as Sn95Sb5, Sn63Pb37 and K100LD.


Product Features

  • Highest activity available in its classification
  • Compatible with high temperature alloys
  • Easy-to-clean
  • Classified as ORH1 per IPC J-STD-004
Technical Bulletins
Documentation icon - Technical Bulletin

Kester OR-421 Flux Cored Wire Technical Bulletin English

Kester OR-421 Water Soluble Flux Cored Solder Wire

This wire solders difficult to solder materials such as brass and nickel, showing excellent wetting, heat stability for use with high temperature solder alloys, and low odor.

The flux residues are near-neutral pH, so they're less corrosive than typical with ORH1 fluxes, and are easy to clean.

AS Kester OR-420 Promo Block
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