KESTER 285 Flux-Cored Wire

Harmonization Code : 8001.20 | Unwrought tin: Tin alloys

Main features

Industry standard RMA cored wire
Compatible with leaded and lead-free alloys
Classified as ROL0 per J-STD-004

Product Description

KESTER 285 Flux‑Cored Wire is a mildly activated rosin flux classified as Type ROL0 under IPC J‑STD‑004. Formerly classified as Type RMA per QQ‑S‑571, KESTER 285 is formulated using high‑quality, purified rosin combined with a synergistic blend of activating agents.

This advanced formulation provides fluxing performance that significantly exceeds ordinary mildly activated rosin fluxes and approaches that of fully activated rosin fluxes. KESTER 285 is specifically designed for electronic soldering applications involving difficult assemblies, where process or specification requirements mandate the use of a mildly activated rosin flux.

Product Key Features

Mildly activated rosin (RMA) flux‑cored wire
Industry‑standard RMA cored wire
Compatible with both leaded and lead‑free solder alloys
Classified as ROL0 per IPC J‑STD‑004, supporting high reliability requirements

Applications

Designed for hand soldering
Difficult or high‑thermal‑mass assemblies

Specifications
Additional Information

Technical Specifications

Additional Information

Process Considerations

Solder iron tip temperatures are most commonly between 315 to 371 °C (600 to 700 °F) for Sn63Pb37 and Sn62Pb36Ag02 alloys and 371 to 427 °C (700 to 800 °F) for lead-free alloys. Heat both the land area and component lead to be soldered with the iron prior to adding 285 cored wire. Apply the solder wire to the land area or component lead. Do not apply the wire directly to the soldering iron tip. If needed, Kester 186 and 186-18 Mildly Activated Rosin Flux may be used as a compatible liquid flux to aid in reworking soldered joints. Kester 186 Mildly Activated Rosin Flux is also available as a Flux-Pen® for optimum board cleanliness.