Solder Connection

Solutions in Soldering Technology

EF-6100 - Wave & Selective Soldering Flux

ALPHA® EF-6100 is a high-reliability, IPC, Bellcore, and JIS compliant, low solids, no-clean flux. It is specifically developed to deliver high reliability and excellent soldering performance combined with outstanding board cosmetics and pin-testability. ALPHA EF-6100 exhibits a low tendency for solder ball generation over a wide variety of solder masks during wave soldering and Selective Soldering operations. ALPHA EF-6100 should be considered for use by any assembler who has board designs which require high reliability, good through-hole-fill, reduced component bridging and reduced skips.

Key Product Features & Benefits: 

  • Exhibits exceptional electrical reliability for a low-solids wave soldering flux. Complies with IPC-J-STD-004 SIR,
  • Bellcore SIR, Bellcore ECM, JIS ECM, and JIS SIR.
  • Thermally stable activators provide minimized solder bridging in a low-solids, no-clean flux for wave soldering and Selective Soldering in lead-free and tin-lead applications.
  • Reduces the surface tension between solder mask and solder to resist solder ball formation.
  • Very low level of non-tacky residue to reduce interference with pin testing and exhibit no visible residue.

Selective Soldering - A Brief Guide

Classified J Standard 0RL0

Shelf Life - 12 Months from DOM


Product Number : EF-6100

Prod. No. 148691.0010

Prod. No. 148691.0005

Prod. No. 148691.0001

Data Sheets and Info

Health & Safety

Technical Bulletin

ROHS Certificate


Q - What does Halide free mean?
A - In many fluxes halides are added to the activation package to promote solderability. In the case of this flux solderability and wetting has been achieved using a range of chemistries which do not contain halides. The inclusion of halides within a flux can promote post soldering residues to become active in the presence of moisture and temperature fluctuations and promote corrosion long term which in turn can cause pcb failure.

Q - What is colophony and can it cause any health issues?
A - Colophony is a generic term for rosin, this is the sap or sticky substance that derives from pine and spruce trees. Its "stickiness" lends itself to being used in a wide range of products. We have traditionally used this product in fluxes due to these specific properties it can however lead to breathing difficulties and skin sensitivity. Always use fume filtration when soldering and change filters regularly.

Q - What is the difference between rosins and resins?
A - The terms are often used interchangeably, but rosin is a naturally occurring substance, and resin is either a modified rosin or completely synthetic material. Rosins are plant based products and are subject to more natural variation than resins, however resins are commonly used in newer flux formulations due to their more consistent performance.

Q - How does IPCJ-STD-004B flux classification work.
A - Flux designation has three components. The first two letters, RO, RE or OR, represent the basic chemical composition: rosin-based, resin-based or organic acid-based. The next component is flux designation, L, M or H, which describes the flux’s activity level as low, medium or high, and the final component, 0 or 1, this indicates if halides are present.

Associated Products

CVP-390 Lead-Free Solder Paste

More Info

BOFA T1 Tip Extraction

More Info

Leaded 63/37 Solid Solder Feed Wire

More Info

Lead-Free SAC305 Solid Solder Feed Wire

More Info