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Bismuth Solders

Home » Products » Solders » Bismuth

  • Bismuth Solders
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Bismuth Solders

Bismuth in many languages1

Latin: Bismuthum

Czech: Bismut

Croatian: Bizmut

English: Bismuth

French: Bismuth

German: Wismut

Italian: Bismuto

Norwegian: Vismut

Portuguese: Bismuto

Russian: Висмуг

Spanish: Bismuto

Swedish: Vismut

1 Source: EnvironmentalChemistry.com

Contact us for more information on bismuth solders

Bismuth (Bi) is being used more and more as a replacement for lead in solder alloys because it is non-toxic. Although the melting temperature of pure bismuth is 271°C, the addition of bismuth will lower the melting temperature of most metals it is alloyed with. Bismuth compounds are also widely used in medical and cosmetic applications.

Features

  • The most popular lead-free bismuth solder alloys are Indalloy® #281 (58Bi 42Sn) which melts at 138°C and Indalloy® #282 (57Bi42Sn1Ag) which melts at 140°C. The addition of the 1% Ag makes the alloy more malleable. Both alloys can be used for step soldering applications. After the initial joints are made with a standard SAC alloy (220°C) subsequent soldering operations can be done using the bismuth alloys.
  • Indalloy #281 and #282 have joint properties similar to those of tin-lead solders, with superior fatigue and copper dissolution characteristics.
  • Bismuth is the most diamagnetic and the least thermally conductive of all metals
  • In addition to being non-toxic it does not oxidize as readily as lead does.

Bismuth Solder Products

  • Bismuth Applications
  • Forms of Bismuth
  • Bismuth Alloys

Bismuth Solders Technical Documents

Whitepapers

Request This Document

Advantages of Bismuth-based Alloys for Low Temperature Pb-free Soldering and Rework

Authors: Dr. Ronald C. Lasky, Ed Briggs

Request This Document

Choosing a Pb-Free Solder Paste

Authors: Christopher Nash

Request This Document

Prospect of Lead Free Alternatives for Reflow Soldering

Authors: Dr. Ning-Cheng Lee

Request This Document

Tin-Silver Bismuth: A Better Lead-Free Alternative?

Authors: Indium Corporation

Presentations

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Application Notes

How to use Fusible Alloys (A4)
How to use Fusible Alloys (US Letter)
INDALLOY® Low Temperature Alloys for Lens Blocking (A4)
INDALLOY® Low Temperature Alloys for Lens Blocking (US Letter)

Product Data Sheets

Bismuth Solder (US Letter)
Bismuth Solder (A4)
Solder Fortification® Preforms (US Letter)

Safety Data Sheets

Indalloy® Metal Mix Containing Bismuth

Bismuth Blog Posts

Indium and Bismuth Alloys for Mechanical Uses (Fusible Alloys)

16 May 2018 by Jim Hisert [view bio]

Some alloys that melt below 300° Celsius are used for applications other than joining two surfaces.

Read More

Properties and Uses of Low-Temperature Solder Alloys – (Part 4)

18 Sep 2017 by Jim Hisert [view bio]

Low temperature alloys have a number of applications, including step soldering and interconnection of molded components. Additionally, its thermal and electrical conductivity make it attractive for bonding and heat transfer.

Read More

Properties and Uses of Low-Temperature Solder Alloys – (Part 3)

11 Sep 2017 by Jim Hisert [view bio]

Expansion during cooling is a property of low-temperature alloys that can be very useful.

Read More

View All Blog Posts

For comments or questions about the content on this page, please contact:

Carol Gowans
Product Manager
cgowans@indium.com

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