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Paste Solder Filler Metals

Solder Jar

Fusion Solder Paste Alloys

Fusion Number Nominal Alloy Composition Solidus Temperature Liquidus Temperature
Sn Pb Bi Ag Other
Lead Free Alloys 281 42 58 281°F 138°C 281°F 138°C
425 91.8 4.8 3.4 410°F 210°C 425°F 219°C
430 96.15 3.5 0.35 Sb* 430°F 221°C 430°F 221°C
431 96.5 3.5 430°F 221°C 430°F 221°C
441 99 1 Cu 440°F 228°C 440°F 228°C
460 95 5 Sb 452°F 233°C 464°F 240°C
500 100 449°F 231°C 449°F 231°C
505 94.65 5 0.35 Sb* 430°F 221°C 473°F 245°C
Tin / Lead Alloys 360 60 40 0.35 Sb* 361°F 183°C 374°F 190°C
361 62 36 2 0.35 Sb* 354°F 180°C 354°F 180°C
365 63 37 0.35 Sb* 361°F 183°C 361°F 183°C
450 50 50 0.35 Sb* 361°F 183°C 421°F 217°C
455 40 60 0.35 Sb* 361°F 183°C 460°F 238°C
560 5 93 2 530°F 277°C 568°F 297°C
570 10 88 2 530°F 277°C 568°F 297°C

* ASTM B32 1970: Antimony added to minimize / prevent Tin Pest

For more details on the above products, download our Paste Brazing Brazing & Soldering Alloys brochure.

Fusion Solder Flux/Binder Systems

Fusion System Key Flux/Binder Properties Base Metal Compatibility
Flux Activity Range (typical) Restrictive Level Residue Residue Removal Brass Copper Stainless Cold Roll Other
Flux Class: Non-Corrosive
GPR 300-525°F (149 – 273°C) Fair Spread – alloy / process dependent Non-Corrosive Organic solvent / hydrocarbon solvent Y Y N N LT
MBC 300-595°F (149 – 313°C) Fair Spread – alloy / process dependent Non-Corrosive Organic solvent / hydrocarbon solvent Y Y N N LT
LPS 300-525°F (149 – 273°C) Very Restrictive Non-Corrosive Organic solvent / hydrocarbon solvent Y Y N N LT
Flux Class: Intermediate
WC 300-525° F (149 – 273°C) Restrictive Moderately Corrosive Hot Water / Detergent Y Y Y Y LT
PWC / PMS Family 300-525°F (149 – 273°C) Very Restrictive Moderately Corrosive Organic solvent / hydrocarbon solvent Y Y LT Y LT
PA / PAD / PAN Family 125-525°F (52 – 273°C) Very Restrictive (PA) Moderately Restrictive (PAN/PAD) Moderately Corrosive Hot Water / Detergent Y Y LT LT LT
SUN 300-525°F (149 – 273°C) Moderately Restrictive Low Corrosivity Hot Water / Detergent Y Y LT LT LT
Flux Class: Corrosive
SFC, FCC, 2JN, SMH Family 300-600°F (149 – 316°C) Moderately Restrictive (SFC, FCC, 2JN) Very Restrictive (SMH) VeryCorrosive Detergent Water / mild acid Y Y Y Y LT
PPP, SSX, SSE Family 300-600°F (149 – 316°C) Restrictive Very Corrosive Detergent Water / mild acid Y Y Y Y LT
WCC, WCE, WCS Family 300-600°F (149 – 316°C) Moderately Restrictive Moderate to Very Corrosive Detergent Water / mild acid Y Y Y Y LT

Y = Common use
N = Not typically recommended
LT = Lab testing required (Depends on base metal, filler metal, and solder process)

For more details on the above products, download our Paste Brazing Brazing & Soldering Alloys brochure.


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