Where's my manners?
Your question was in regard to the electrical conductivity of solders..here's a short table of the typical solders I use. Sorry the table went away as well as the spacing format..
Notes: the first column is the indalloy alloy number. The second is the melting temperature in degrees C, the third is the conductivity with respect to copper, the fourth is the alloy makeup, for alloys at or above 100 C.
alloy melt T %conductivity alloy type
C of copper
117 47 4.5
136 58 2.43
19 60 3.3
140 65 3.5
158 70 4
23 73 3.1
160-190 88 4.3
39 96 2.3 52 Bi/30 Pb/18 Sn
1E 118 11.7 52 In/48 Sn
255 124 4 55 Bi/45 Pb
1 125 11.7 50 In/50 Sn
281 138 4.5 58 Bi/42 Sn
290 143 23 97 In/3 Ag
4 156 24 100% indium
9 167 12.2 70Sn/18Pb/12In
106 183 11.5 This is standard lead tin solder
121 221 16 This is the standard tin silver we use in cry apps
Cheers, John