Solder Connection

Solutions in Soldering Technology

Lead-Free SAC305 Solid Solder Feed Wire

SAC305 Solid Solder Wire is a lead-free alloy suitable for use as a replacement for Sn63 alloy. As with all Alpha Metals bar solder, Alpha’s proprietary Vaculoy® alloying process is used to remove certain impurities, particularly oxides.

These larger diameter feed wires have been designed with selective  soldering in mind. The solder wire is manufactured to high tolerances  and wound onto 4 kg reels at a constant tension to ensure a smooth take  off through the machine feed mechanism into the solder pot.

Key Products Features & Benefits: 

  • Yield – Best in class yield, out performs all Sn/Cu based materials
  • Wetting speed – fast wetting, in back to back tests 0.65s compared to 1.00s, for Sn/Cu based materials.
  • Dross generation – Low dross generation delivered by Vaculoy alloy conditioning.
  • Excellent solderability due to fast wetting speed.
  • Very good drainage,  has lower levels of bridging compared to Sn/Cu alloys.
  • Delivers excellent performance across a wide range of Flux technologies

Selective Soldering - A Brief Guide

Customer Note -

54840 is not a stocked item, MOQ's may apply. Please contact for more information


Prod. No. 51421

Prod. No. 54840

Data Sheets and Info

Health & Safety

Technical Bulletin

ROHS Certificate

Related Technical Documents


Q - How many different alloys are available in the lead free range?
A - This feed wire is supplied in SAC305,SAC405 and low silver SACX.

Q - What are the the melt point of these Alloys
A - SAC305 217C - 219C
SACX0307 217C - 228C

Q - What Temperature should l run my solder bath?
A - The solder bath should be run at 255C -265C

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.

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