Specialty Solder Spheres

Specialty Solder Spheres

Indium Corporation is a supplier of specialty solder and brazing spheres in small to mid-size volumes. We offer a wide variety of alloys and sizes from around 0.004” (100 microns) to 0.078” (1.98mm), depending on the alloy. Melting points range from below 90°C to over 700°C.

Features & Benefits

We supply many of the leading suppliers of medical, transportation and automotive, military and aerospace, high-end mobile devices, and computing equipment.

Our customers come to us because we can supply consistently high-quality materials for precision assembly challenges.

  • Accurate diameters
  • Wide range of alloys (<90°C to >700°C)
  • Capable of supplying quantities from 1 sphere to >20 million per month\
  • Clean manufacturing and processing ensures low-oxide levels with no organic contamination
  • Whiteroom finishing and packaging ensures continuity of cleanliness
  • Pure metals ensure high-quality finished spheres
  • Manufactured in IATF-16949 certified facilities

Typical Alloys and Diameters

Pb-Free Alloys

  Approximate Manufacturable Diameter Range
Alloy Indalloy® # Melting Point
Solidus (°C)		 Melting Point
Liquidus (°C)		 Min
(Inches)		 Max
(Inches)		 Min
(µm)		 Max
(µm)
InSn50 1 118 125 0.004 0.030 102 762
InSn48
(In/Sn eutectic)		 1E 118 0.004 0.035 102 889
BiSn42
(Bi/Sn eutectic)		 281 138 0.008 0.109 203 2,769
BiSn42Ag1 282 139 140 0.008 0.030 203 762
99.99In
("Pure Indium")		 4 157 0.004 0.050 102 1,270
SnIn20Ag2.8
(Pb-free "Sn63")		 227 175 187 0.004 0.030 102 762
SnAg3Cu0.5
(SAC305)		 256 217 220 0.004 0.065 102 1,651
SnAg4Cu0.5
(SAC405)		 252 217 225 0.004 0.035 102 889
SnAg4 121 221 228 0.004 0.021 102 533
SnAg5 132 221 240 0.004 0.032 102 800
AuSn20
(Au/Sn eutectic)		 182 280 0.004 0.039 102 991

Pb-Containing Alloys

  Approximate Manufacturable Diameter Range
Alloy Indalloy® # Melting Point
Solidus (°C)		 Melting Point
Liquidus (°C)		 Min
(Inches)		 Max
(Inches)		 Min
(µm)		 Max
(µm)
SnPb46Bi8 240 160 173 0.010 0.030 254 762
SnPb36Ag2
(Sn62)		 Sn62 179 181 0.004 0.030 102 762
SnPb37
(Sn63)		 106 183 0.004 0.050 102 1,270
PbIn25 110 183 192 0.004 0.027 102 686
PbIn40 206 197 231 0.004 0.020 102 508
PbSn10 159 275 302 0.004 0.040 102 1,016