Pewter (Solder) Melting point information.

Taken from http://www.logwell.com/ page on solders.
The temperature range represents the Solidus (low) and the Liquidus(high)
Solidus - Point where solder becomes solid. 
Liquidus - Liquid point
Between the two points the alloy becomes more and more plastic
Eutectic - Alloy where the solidus and liquidus are the same. The solder goes from solid to liquid without the plastic state. Also, the melting point tends to be lower than other alloy mixes of the same type.

Alloy Eutectic Temps  
Sn62Pb36Ag02   354-372°F 179-189°C
Sn60Pb36Ag04   354-475°F 179-246°C
Sn63Pb37 X 361°F 183°C
Sn60Pb40   361-374°F 183-190°C
Sn55Pb45   361-397°F 183-203°C
Sn50Pb50   361-420°F 183-214°C
Sn45Pb55   361-440°F 183-225°C
Sn40Pb60   361-460°F 183-238°C
Sn35Pb65   361-477°F 183-247°C
Sn30Pb70   361-496°F 183-258°C
Sn25Pb75   361-514°F 183-268°C
Sn20Pb80   361-536°F 268-302°C
Sn96.5Ag03Cu0.5   422-428°F 217-220°C 
Sn96.6Ag3.0Cu0.5   422-428°F 217-220°C
Sn95.5Ag3.8Cu0.7   422-430°F 217-221°C
Sn96.5Ag3.5 X 430°F 221°C
Sn96Ag04   430-444°F 221-229°C
Sn95Ag05   430-473°F 221-245°C
Sn99.3Cu0.7   440°F 227°C
Sn100   450°F 232°C
Sn95Sb05   450-464°F 232-240°C
Sn10Pb88Ag02   514-570°F 268-299°C
Sn10Pb90   514-576°F 268-302°C
Sn05Pb92.5Ag2.5 X 536°F 280°C
Sn05Pb93.5Ag1.5   565-574°F 296-301°C
Sn05Pb95   574-597°F 301-314°C

Compiled from http://www.kester.com/en-US/technical/alloy.aspx and http://www.logwell.com/

Fluxes

In the soldering process, the primary purpose of flux is to prevent oxidation of the base and filler metals.  The solders discussed herein attach well to copper, but poorly to the various oxides of copper, which form quickly at soldering temperatures. Rosin based flux is nearly inert at room temperature, but becomes strongly reducing at elevated temperatures, preventing the formation of metal oxides.  Secondarily, flux facilitates wetting in the soldering process.

Rosin fluxes can be cleaned up nicely with Pure Grain Alcohol (PGA), but avoid the Completely Denatured Alcohol (CDA) typically sold through retail outlets in the United States since it contains nasty denaturing additives.  See our Cleaning Secrets Revealed page for more information on flux cleaners. 


Low Melt Alloys
 
Constituents -Weight Percent
Melting Points
Alloy
Bismuth
Lead
Tin
Cadmium
Indium
Silver
Solidus
Liquidus
Designation
Bi
Pb
Sn
Cd
In
Ag
°F
°C
°F
°C
117
44.7
22.6
8.3
5.3
19.1
0
117
47
117
47
136
49
18
12
0
21
0
136
58
136
58
158
50
26.7
13.3
10
0
0
158
70
158
70
158-190
42.5
37.2
11.3
9
0
0
158
70
190
88
174
57
0
17
0
26
0
174
79
174
79
203
52.5
32
15.5
0
0
0
203
95
203
95
255
55.5
44.5
0
0
0
0
255
124
255
124
281
58
0
42
0
0
0
281
138
281
138
281-338
40
0
60
0
0
0
281
138
338
170
291-325
14
43
43
0
0
0
291
144
325
163
244
0
0
48
0
52
0
244
118
244
118
296
0
0
0
0
97
3
296
147
296
147
293
0
30.5
51.2
18.3
0
0
293
145
293
145
300-302
0
15
0
0
80
5
300
149
302
150
307-323
0
18
70
0
12
0
307
153
323
162
320-345
0
30
0
0
70
0
320
160
345
174

http://www.solders.com/low_melt_alloys.htm