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4-6 Lead-free Solder Bar Alloy Composition Selection Guide
Composition selection of solder alloys
4-6 Lead-free Solder Bar Alloy Composition Selection Guide
4-6-1 Sn-Cu Alloys
| Series | Alloy Composition | Melting Point(℃) | Proposed Temperature | Recommendation |
| WH-10 | S-Sn99.90 | 232 | 240-260 | |
| WH-11 | S-Sn98Cu2 | -- | -- | |
| WH-22 | S-Sn99.7Cu0.3 | 227 | 240-260 | |
| WH-23 | S-Sn99.3Cu0.7 | 227 | 240-260 | Widely Used,Economical |
| WH-24 | S-Sn99Cu1 | 227-240 | 240-260 | |
| WH-25 | S-Sn97Cu3 | 227-275 | 240-260 | |
| WH-323 | S-Sn99Cu0.6Ni0.4 | 226 | 240-260 |
4-6-2 Sn-Ag Alloys
| Series | Alloy Composition | Melting Point(℃) | Proposed Temperature | Recommendation |
| WH-26 | S-Sn97Ag3 | 221-230 | 240-260 | |
| WH-27 | S-Sn96.5Ag3.5 | 221 | 240-260 | |
| WH-28 | S-Sn96Ag4 | 221-225 | 240-260 | |
| WH-331 | S-Sn77In20Ag3 | 178-189 | 240-260 | |
| WH-372 | S-Sn99Ag1 | — | — |
4-6-3 Sn-Ag-Cu Alloys
| Series | Alloy Compostion | Melting Point(℃) | roposed Temperature | Recommendation |
| WH-316 | S-Sn97Ag1Cu2 | — | — | |
| WH-326 | S-Sn96.5Ag3Cu0.5Ce | 217-219 | 240-260 | Widely use for high-end electronic products |
| WH-327 | S-Sn95.5Ag3.5Cu1 | 218 | 240-260 | |
| WH-328 | S-Sn93Ag5Cu2 | 217 | 240-260 | |
| WH-329 | S-Sn95Ag4Cu1 | 206-219 | 240-260 | |
| WH-373 | S-Sn99Ag0.3Cu0.7 | — | — | For general electronic products |
| WH-404 | S-Sn92Ag5Cu2Sb1 | — | — | Military used |
| WH-402 | S-Sn96.5Ag2Cu1Sb0.5 | 216-222 | 240-260 |
4-6-4 Sn-Zn （Eutectic） alloys
| Series WH-29 | Alloy Compositions S-Sn91Zn9 | Melting Point(℃) 188 | Proposed Tempeture 240-260 | Recommendation |
4-6-5 Sn-Bi-X Alloys
| Series WH-330 | Alloy Composition | Melting Point(℃) | Proposed Tempeture | Recommendation |
| WH-330 | S-Sn93Ag4Bi3 | 219-221 | 240-260 | |
| WH-332 | S-Sn90Bi8Ag2 | 207-212 | 240-260 | |
| WH-333 | S-Sn88Zn7Bi5 | 180-198 | 240-260 | |
| WH-138 | S-Sn42Bi58 | 138 | 160-180 | Low melting point |
| WH-139 | S-Sn64Bi35Ag1 | 139 | -- | Low melting point |
4-6-6 Sn-Sb Alloys
| Series WH-210 | Alloy Composition S-Sn95Sb5 | Melting Point(℃) 232 | Proposed Tempeture 240-260 | Recommendation |
