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EN
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At present, there are dozens of lead-free solder materials, and the alloy materials used are also diverse, including binary, ternary, and multicomponent alloy compositions.
But in general, most of them are composed mainly of tin Sn, with appropriate addition of metal elements such as silver Ag, zinc Zn, copper Cu, antimony Sb, bismuth Bi, indium In, etc., and mainly improve the alloy properties through solder alloying to obtain ideal mechanical, electrical, and thermal properties.
Product features and advantages
· Good Mechanical Properties
· Superior electrical conductivity
· High thermal conductivity
Typical Products
Sn-Ag-Cu Preforms
Sn-Ag-Cu (SAC) is the most common alloy in soldering electronics. Such as those alloys whose melting point is around 217℃, like SAC105（Sn98.5Ag1Cu0.5), SAC305 (Sn96.5Ag3Cu0.5)、SAC387(Sn95.5Ag3.8Cu0.7) and SAC405（Sn95.5Ag4Cu0.5） are usually used in reflow, wave and manual soldering.
Among above, SAC305 are more wildly used. Compared with Sn63Pb37, it has better performance on stiffness, tensile strength, yield strength, shear strength, impact strength and creep strength; compared with Sn-Cu/Sn-Ag preforms, it’s wetting properties are better.
Model |
Solid Lin ℃ |
Liquidus ℃ |
Eutectic Alloy ℃ |
Density g/cm3 |
Resistivity µΩ.m |
Thermal Conductivity W/m.K |
Thermal Expansion Coefficient 10-6/℃ |
Tensile Strength Mpa |
|---|---|---|---|---|---|---|---|---|
| Bi58Sn42 | / | / | 138 | 8.56 | 0.383 | / | 15 | 55.16 |
| Bi57Sn42Ag1 | 138 | 140 | / | 8.57 | / | 138 | / | / |
| Sn98.5Ag1.0Cu0.5 | 217 | 227 | / | 7.32 | 0.133 | 217 | / | 40 |
| SAC305(Sn96.5Ag3.0Cu0.5) | 217 | 218 | / | 7.37 | 0.132 | 217 | 21 | 50 |
| Sn95.5Ag3.8Cu0.7 | 217 | 220 | / | 7.4 | 0.132 | 217 | 22 | 48 |
| SAC405（Sn95.5Ag4.0Cu0.5) | 217 | 220 | / | 7.4 | 0.132 | 217 | / | 51.5 |
| Sn96Ag3.5Cu0.5 | 217 | 218 | / | / | / | 217 | / | / |
| Sn96.5Ag3.5 | / | 221 | / | 7.37 | 0.108 | / | 30 | 39 |
| Sn95Ag5 | 221 | 240 | / | 7.4 | 0.137 | 221 | 23 | 55.2 |
| Sn95.5Ag3.9Cu0.6 | 217 | 220 | / | / | / | 217 | / | / |
| Sn99Ag0.3Cu0.7 | 217 | 227 | / | / | / | 217 | / | / |
| Sn95Sb5 | 235 | 240 | / | 7.25 | 0.145 | 235 | 31 | 40.7 |
