Alloys
Solder Alloys
Since our founding in 1934, Indium Corporation has been a global leader in specialty solders and alloy development. Our research and development team, which includes many Ph.D. metallurgists, collaborates on our core metals to develop alloys that tackle current and emerging soldering and sealing challenges.
Powered by Indium Corporation
- Patented Alloy Technologies
- World-Class Development Team and Labs
- 90+ Years of Experience
Product Overview
Application Expertise
Our global applications engineering teams are available for consultations to fully understand your unique needs.
Various Forms
Most solder alloys can be supplied in the form of pastes, preforms, wires, bars, spheres, and more.
Mixed Alloy Technology
Our patented mixed alloy technology, Durafuse®, tackles the latest soldering challenges. Since its introduction, multiple products featuring this technology have evolved and been adopted by major OEMs, EMS providers, and OSATs.
Liquid Metal for Thermal Interface (<30ºC)
- Indalloy® 51E (GaInSn)
- Indalloy® 60 (GaIn)
- Indalloy® 77 (GaIn)
- Indalloy® 300E (GaIn)
Low-Temperature Solder and Sealing (30–210ºC)
- Indalloy® 1E (InSn)
- Indalloy® 4 (In)
- Indalloy® 38 (BiPbSn)
- Indalloy® 117 (BiPbInSnCd)
- Indalloy® 227 (SnInAg)
- Indalloy® 254 (SnInAg)
- Indalloy® 281 (BiSn)
- Indalloy® 282 (BiSnAg)
Traditional Soldering (150–260ºC)
- Indalloy® 100 (SnPbAg)
- Indalloy® 106 (Sn63)
- Indalloy® 121 (SnAg)
- Indalloy® 241 (SAC387)
- Indalloy® 256 (SAC305)
- Indalloy® 276 (SnAg+)
- Indalloy® 291 (SnCu+)
High-Temperature Soldering (230–360ºC)
- Indalloy® 133 (SnSb)
- Indalloy® 228 (Sn10)
- Indalloy® 266 (HMP)
- Indalloy® 292
Au and Braze Alloys (>280ºC)
- Indalloy® 182 (AuSn)
- Indalloy® 183 (AuGe)
- Indalloy® 193 (AgCu)
- Indalloy® 200 (Au)
Six Solder Alloy Families
Choosing the right solder alloy is essential for creating reliable, durable connections. Factors such as melting temperature, mechanical strength, and electrical conductivity play a key role in this decision. Our team is here to offer expert guidance on alloy selection and application to help you achieve success.
While melting temperature is typically the primary consideration, our Solder Alloy Selector Guide makes it easy to filter options by operational and process temperatures. You can also sort alloys by Pb-free, Cd-free, and RoHS-compliant criteria to ensure compliance with industry standards.
Gallium
| Indalloy® # | Composition | Liquidus/Solidus Temperature (°C) |
|---|---|---|
| 51E | Ga66.5/In20.5/Sn13 | 11 Eutectic |
| 300E | Ga78.6/In21.4 | 15.7 Eutectic |
Bismuth
| Indalloy® # | Composition | Liquidus/Solidus Temperature (°C) | Solidus Temperature (°C) |
|---|---|---|---|
| 281 | Bi58/Sn42 | 138 Eutectic | |
| 282 | Bi57/Sn42/Ag1 | 140 | 139 |
Indium
| Indalloy® # | Composition | Liquidus/Solidus Temperature (°C) | Solidus Temperature (°C) |
|---|---|---|---|
| 1E | In52/Sn48 | 118 Eutectic | |
| 1 | In50/Sn50 | 126 | 118 |
| 290 | In97/Ag3 | 143 Eutectic | |
| 2 | In80/Pb15/Ag5 | 154 | 149 |
| 4 | In100 | 157 Melting Point | |
| 204 | In70/Pb30 | 175 | 165 |
| 205 | In60/Pb40 | 181 | 173 |
| 227 | Sn77.2/In20/Ag2.8 | 187 | |
| 7 | In50/Pb50 | 210 | 184 |
| 3 | In90/Ag10 | 237 | 143 |
| 164 | Pb92.5/In/Ag2.5 | 310 | 300 |
Tin
| Indalloy® # | Composition | Liquidus/Solidus Temperature (°C) | Solidus Temperature (°C) |
|---|---|---|---|
| 106 | Sn63/Pb37 (Sn63) | 183 Eutectic | |
| 121 | Sn96.5/Ag3.5 | 221 Eutectic | |
| 133 | Sn95/Sb5 | 240 | 237 |
| 256 | Sn96.5/Ag3/Cu0.5 (SAC305) | 220 | 217 |
Lead
| Indalloy® # | Composition | Liquidus/Solidus Temperature (°C) | Solidus Temperature (°C) |
|---|---|---|---|
| 151 | Pb92.5/Sn5/Ag2.5 | 306 | 298 |
| 164 | Pb92.5/In5/Ag2.5 | 310 | 300 |
Gold
| Indalloy® # | Composition | Liquidus/Solidus Temperature (°C) | Solidus Temperature (°C) |
|---|---|---|---|
| 182 | Au80/Sn20 | 280 Eutectic | |
| 183 | Au88/Ge12 | 356 Eutectic | |
| 184 | Au96.8/Si3.2 | 363 Eutectic | |
| 200 | Au100 | 1,064 Melting Point |
Solder Alloy Guide
Looking for a specific alloy? Visit our Solder Alloy Selector Guide to figure out which Indium Corporation alloy is right for your application, or download our Solder Alloy Directory to browse the available Indalloys.
Solder Alloy Products
Indalloy®301LT
Indalloy® 301LT offers versatile solder forms &…
Indalloy®276
Pb-free solder offering high reliability up to…
Durafuse® LT
Patented low-temperature mixed alloy system for high…
Durafuse® HT
High-temperature Pb-free solder paste alloy Durafuse® HT.
Durafuse® HR
High-reliability & low-voiding Solder Alloy Durafuse® HR.
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