Features:
- Lead-free eutectic solder
- Melting temperature 143ºC
- Good ductility and thermal conductivity
- Good fatigue resistance
Description:
In97Ag3 is a kind of low temperature lead-free solder with a melting temperature of 143ºC . In comparison with Sn-based solder, In97Ag3 can inhibit the corrosion of Au or Ag. Meanwhile, In97Ag3 possess low melting temperature, excellent fatigue resistance, good ductility and thermal conductivity, making it suitable for soldering of glass and ceramics.
Solder Composition:
Element | Wt% |
Indium (In) | Margin |
Silver (Ag) | 3.0 ± 0.2 |
Physical Properties:
Product name | Melting point/ºC solid / liquid phase | Density g/cm3 | Resistivity µΩ·m | Thermal conductivity W/m·K | Thermal expansion coefficient 10-6/ºC | Tensile strength Mpa |
In97Ag3 | 143 | 7.38 | 0.075 | 73 | 22 | 5.5 |
Method of Use:
Reflow Profile
Preheating stage | Heat preservation stage | Soldering stage | Cooling stage |
Room-temperature ~ 105ºC | 105~ 143ºC | 143~ 175ºC | 143ºC ~ Room-temperature |
Time | Time | Time | Cooling rate |
50~80s | 50~120s | 50~80s | 3 ~ 5ºC/s |

(For reference only, the reflow profile should be adjusted according to the actual soldering situation)
Operation Details:
- Picking up:
Use an anti-static tools to pick up the solder to prevent solder contamination and deformation.
- Operating environment:
Atmosphere | Parameter requirements |
N2 | Oxygen concentration(200~ 1000ppm) |
Vacuum | Vacuum degree ≤ 2.0×10-3Pa |
- Flux Compatibility:
In97Ag3 solder is compatible with regular no-clean and water-soluble electronic grade fluxes currently.
Dimension Tolerance:
Thickness(t) | Typical tolerances for length, width or diameter(L/W/D) | |
t <0.40mm | ±0.02mm | |
0.40mm≤ t <1.00mm | ±0.03mm | |
t ≥1.00mm | ±0.05mm | |
Thickness(t) | Thickness (t) | |
Conventional solder alloys | Indium alloy | |
t<0.05mm | ±0.005mm | ±0.01mm |
0.05mm≤ t <0. 10mm | ±0.008mm | ±0.01mm |
0. 10mm≤ t <0.20mm | ±0.01mm | |
0.20mm≤ t <0.40mm | ±0.02mm | |
0.40mm≤ t <1.00mm | ±0.03mm | |
t ≥1.00mm | ±5% |
Storage and Product Management:
- Storage
The best storage temperature of this product is 25±5 ºC, and the relative humidity is no higher than 55%RH.
- Product management
Keep container tightly closed when product is not in use.
Safety:
- Please use this product with adequate ventilation and certain personal protection conditions.
- Please do not mix with other toxic chemicals.


Category | Products | Solidus(ºC) | Liquidus(ºC) | Density (g/cm3) | Resistivity (μΩ·m) | Thermal Conductivity (W/m ·K) | CTE (10-6/ºC) | Tensile Strength (MPa) |
Solder Metal | In51Bi32.5Sn16.5 | / | 60(e) | 7.88 | 0.522 | / | 22 | 33.44 |
In66.3Bi33.7 | / | 72(e) | 7.99 | / | / | / | / | |
Bi50Pb28Sn22 | / | 100(e) | 9.44 | / | / | / | / | |
In52Sn48 | / | 118(e) | 7.3 | 0. 147 | 34 | 20 | 12 | |
In50Sn50 | 118 | 125 | 7.3 | 0. 147 | 34 | 20 | 11.86 | |
Bi58Sn42 | / | 138(e) | 8.56 | 0.383 | 19 | 15 | 55. 16 | |
Bi57Sn42Ag1 | 138 | 140 | 8.57 | / | / | / | / | |
In97Ag3 | / | 143(e) | 7.38 | 0.075 | 73 | 22 | 5.5 | |
Sn43Pb43Bi14 | 144 | 163 | 9.02 | / | / | 24 | 44. 1 | |
In80Pb15Ag5 | 149 | 154 | 7.85 | 0. 133 | 43 | 28 | 17.58 | |
Sn53Pb37Bi10 | 150 | 168 | 8.65 | / | / | / | / | |
Sn70Pb18In12 | 154 | 167 | 7.79 | 0. 141 | 45 | 24 | 36.68 | |
In100 | / | 157(mp) | 7.31 | 0.072 | 86 | 29 | 1.88 | |
In70Pb30 | 165 | 175 | 8. 19 | 0. 195 | 38 | 28 | 23.79 | |
In60Pb40 | 174 | 185 | 8.52 | 0.246 | 29 | 27 | 28.61 | |
Sn77.2In20Ag2.8 | 175 | 187 | 7.25 | 0. 176 | 54 | 28 | 46.88 | |
Sn62Pb36Ag2 | / | 179(e) | 8.42 | 0. 145 | 42 | 27 | 44 | |
Sn63Pb37 | / | 183(e) | 8.4 | 0. 146 | 51 | 25 | 52 | |
In50Pb50 | 184 | 210 | 8.86 | 0.287 | 22 | 27 | 32.2 | |
Pb60In40 | 197 | 231 | 9.3 | 0.331 | 19 | 26 | 34.48 | |
Sn86.9In10Ag3. 1 | 201 | 205 | 7.37 | / | / | / | / | |
Au10Sn90 | / | 217(e) | 7.78 | / | / | / | 50.2 | |
SAC387(Sn95.5Ag3.8Cu0.7) | / | 217(ne) | 7.4 | 0. 132 | 57 | 22 | 48 | |
SAC305(Sn96.5Ag3.0Cu0.5) | 217 | 218 | 7.37 | 0. 132 | 58 | 21 | 50 | |
Sn96.5Ag3.5 | / | 221(e) | 7.37 | 0. 108 | 33 | 30 | 39 | |
Sn99.3Cu0.7 | / | 227(e) | 7.31 | / | / | / | / | |
Sn100 | / | 232(mp) | 7.29 | 0. 111 | 73 | 24 | 13. 1 | |
Sn65Ag25Sb10 | / | 233(e) | 7.8 | / | / | 36 | 117.2 | |
Sn95Sb5 | 235 | 240 | 7.25 | 0. 145 | 28 | 31 | 40.7 | |
Sn90Sb10 | 240 | 250 | 7.22 | / | 42 | 27 | 44 | |
Pb75In25 | 240 | 260 | 9.97 | 0.375 | 18 | 26 | 37.58 | |
Pb88Sn10Ag2 | 268 | 290 | 10.75 | 0.203 | 27 | 29 | 22.48 | |
Pb90Sn10 | 275 | 302 | 10.75 | / | / | 24.6 | 32 | |
Au80Sn20 | / | 280(e) | 14.52 | 0.224 | 57 | 16 | 276 | |
Pb92.5Sn5Ag2.5 | 287 | 296 | 11.02 | 0.2 | 29 | 24 | 29.03 | |
Pb90Sn5Ag3In2 | 294 | 297 | 10.89 | / | / | / | / | |
Pb92.5In5Ag2.5 | 300 | 310 | 11.02 | 0.313 | 25 | 25 | 31.44 | |
Au88Ge12 | / | 361(e) | 14.67 | 0. 151 | 44 | 13.4 | 185 | |
Au96.8Si3.2 | / | 363(e) | 15.4 | / | 27 | 12 | 255 | |
Au98Si2 | 363 | 390 | 16.92 | / | / | / | / | |
Brazing Metal | Ag60Cu30Sn10 | 600 | 720 | 9.58 | / | / | / | / |
Ag72Cu28 | / | 780(e) | 10 | / | 352 | 17.8 | 250-360 | |
Ag50Cu50 | 780 | 870 | 9.67 | / | / | / | / | |
Au60Ag20Cu20 | 835 | 845 | 13.79 | / | / | / | / | |
Ag92.5Cu7.5 | / | / | 10.37 | / | / | / | / | |
Au80Cu20 | / | 910(e) | 15.67 | / | / | / | / | |
Au50Cu50 | 955 | 970 | 12.22 | / | / | / | / | |
Ag100 | / | 961(mp) | 10.49 | 0.0163 | 429 | / | 180 | |
Au100 | / | 1064(mp) | 19.3 | 0.0221 | 318 | 14 | 138 | |
Cu100 | / | 1083(mp) | 8.96 | 0.0172 | 401 | / | 246 |

