Choosing a Flux by Application

The following table is an easy-to-use chart that helps you find the right flux for your application. It is not all-inclusive: we have many fluxes in addition to those that appear in the chart below. If you need any assistance, don’t hesitate to Contact Us. Please avail yourself of the following additional resources:

How to Pick a Flux – An easy-to-follow guide that helps you understand and choose fluxes.

Flux by Specification – A chart that lists fluxes per various industry and/or government specifications.

Flux by Application – Easy-to-use flux table that matches fluxes with applications.


ProcessMetal / ApplicationAdditional Info.Solder / Braze AlloyTemperaturesLinkRecommendation
SolderingStainless SteelActive Flux RequiredTin-Based95 - 425¡C 200 - 800¡FStainless Steel Soldering FluxNo. 71
SolderingAluminumLow TempTin-Based177 - 288¡C 350 - 550¡FAluminum Soldering FluxNo. 1261
SolderingAluminumHigh TempZinc-Aluminum345 - 425¡C 650 - 800¡FAluminum Soldering FluxNo. 1280
SolderingCopperGeneral Purpose, Safer FluxTin-Based95 - 315¡C 200 - 600¡FSuperior SupersafeNo. 30
SolderingCopper - Badly OxidizedInorganic Acid fluxTin-Based95 - 345¡C 200 - 650¡FCopper Soldering FluxNo. 75, No. 130
SolderingCopper Pipes - PlumbingPetroleum BasedTin-Based93 - 315¡C 200 - 600¡FPlumbing FluxesNo. 130
SolderingCopper Pipes - PlumbingWater-Soluble (ASTM B-813)Tin-Based93 - 315¡C 200 - 600¡FPlumbing FluxesNo. 141
SolderingBrassBrass-to-Brass, Brass-to-CopperTin-Based260 - 425¡C 500 - 800¡FBrass Soldering FluxNo. 90, No. 90-Paste, No. 520B
SolderingCopper-Brass RadiatorCopper, BrassTin-BasedSee Web PageRadiator FluxesFluxes for all parts of copper-brass radiators
SolderingNickelOrganic AcidTin-Based95 - 315¡C 200 - 600¡FComponent Lead TinningNo. 40MM4, No. 45
SolderingZinc MetalInorganic Acid fluxTin-Based260 - 425¡C 500 - 800¡FSoldering Flux for Zinc MetalNo. 71 Paste, No. 71
SolderingGalvanized SteelAlso good for ZincTin/Lead95 - 425¡C 200 - 800¡FGalvanized Steel Soldering FluxSee No. 71
SolderingRosin FluxType RTin-Based200 - 260¡C 390 - 500¡FRosin FluxesNo. 97
SolderingRosin FluxType RMATin-Based200 - 260¡C 390 - 500¡FRosin FluxesNo. 99
SolderingRosin FluxType RMA - PasteTin-Based200 - 260¡C 390 - 500¡FRosin FluxesNo. 9000
SolderingRosin FluxType RATin-Based200 - 260¡C 390 - 500¡FRosin FluxesNo. 100
SolderingRosin FluxType RA - High TempTin-Based200 - 450¡C 390 - 840¡FRosin FluxesNo. 100HT
SolderingIndustrial Continous Wire & Strip TinningCopper, Steel, BrassTin-BasedSee Web PageWire and Strip TinningFluxes for various gages and alloys
SolderingSoldering SaltsBare Copper, Cast Iron BabbittTin/Lead, Tin/Antimony130 - 500¡C 265 - 930¡FSoldering Salts & Babbitt FluxTara 350
SolderingBattery Cast-on-StrapLead BatteriesLead-Based260 - 455¡C 500 - 850¡FBattery CoS FluxesSee Web Page
SolderingRoof SolderingCopper or SteelTin/Lead95 - 315¡C 200 - 600¡FRoof Solder FluxRubyFluid Flux
SolderingStained GlassCopper FoilTin-Based95 - 315¡C 200 - 600¡FStained GlassNo. 30 or RubyFluid
SolderingComponent Lead TinningCopperTin-Based95 - 315¡C 200 - 600¡FComponent Lead TinningNo. 30, No. 45
SolderingComponent Lead TinningNickelTin-Based95 - 315¡C 200 - 600¡FComponent Lead TinningNo. 40MM4, No. 45DSA
SolderingComponent Lead TinningHalogen-FreeTin-Based200 - 280¡C 390 - 540¡FComponent Lead TinningNo. 430MB, No. 435 (3:1)
SolderingElectronics Wire TinningCopper, NickelTin-Based200 - 280¡C 390 - 540¡FElectronics Wire TinningNo. 30, No. 45
SolderingElectronics Wire TinningNo-CleanTin-Based200 - 270¡C 390 - 520¡FElectronics Wire TinningNo. 334
SolderingPCB Wave SolderWater-SolubleTin-Based200 - 315¡C 390 - 600¡FPCB Wave Soldering FluxNo. 80, No. 84
SolderingPCB Wave SolderNo-Clean, Alcohol, (2% Solids)Tin-Lead200 - 270¡C 390 - 520¡FPCB Wave Soldering FluxNo. 312
SolderingPCB Wave SolderNo-Clean, Alcohol, (3% Solids)Lead-Free200 - 270¡C 390 - 520¡FPCB Wave Soldering FluxNo. 325
SolderingPCB Wave SolderNo-Clean, Alcohol, (4% Solids)Lead-Free200 - 270¡C 390 - 520¡FPCB Wave Soldering FluxNo. 315LF
SolderingPCB Wave SolderNo-Clean, VOC-Free (2% Solids)Tin-Lead200 - 270¡C 390 - 520¡FPCB Wave Soldering FluxNo. 420F
SolderingPCB Wave SolderNo-Clean, VOC-Free (4% Solids)Lead-Free200 - 270¡C 390 - 520¡FPCB Wave Soldering FluxNo. 420F-LF
SolderingPCB Selective SolderingNo-Clean, VOC-FreeTin-Based200 - 350¡C 390 - 660¡FSelective Soldering FluxSSF-NC50
SolderingPCB Selective SolderingNo-Clean, Alcohol-BasedTin-Based200 - 350¡C 390 - 660¡FSelective Soldering FluxSSF-NC400
SolderingPCB Selective SolderingWater-SolubleTin-Based200 - 350¡C 390 - 660¡FSelective Soldering FluxSSF-WS800
SolderingPCB Selective SolderingRosin Flux - Type RMATin-Based200 - 350¡C 390 - 660¡FSelective Soldering FluxSSF-RMA20
SolderingPCB Selective SolderingTinning of Solder NozzleTin-Based95 - 350¡C 200 - 660¡FSelective Soldering FluxNo. 75, No. 23
SolderingPCB Repair FluxTacky FluxTin-Based120 - 400¡C 250 - 750¡FTacky Flux: BGA AssemblyNo. 3000, No. 9000
SolderingPCB Repair FluxRosin Flux - Type RMATin-Based200 - 260¡C 390 - 500¡FPCB Repair FluxNo. 99
SolderingPCB Repair FluxRosin Paste FluxTin-Based200 - 260¡C 390 - 500¡FPCB Repair FluxNo. 135
SolderingPCB Repair FluxWater-Soluble Gel Flux/CleanerTin-Based95 - 315¡C 200 - 600¡FPCB Repair FluxSybergel
SolderingSMT PCB Boards: Solder PasteSolder Paste: No-Clean and Water-SolubleLead-Free, Lead Bearing200 - 260¡C 390 - 500¡FSMT Solder PasteSee various pastes
SolderingBGA Attachment: Tacky FluxTacky Flux: No-Clean and Water-SolubleTin-Based120 - 400¡C 250 - 750¡FTacky Flux: BGA AssemblySee various tacky fluxes
SolderingDross Reducer PowderReduces Dross WasteTin-Based235 - 260¡C 455 - 500¡FDross Reducer PowderDross Reducer Powder
SolderingHot Air Leveling FluxPCB FabricationTin-BasedPer heat cycleHot Air Leveling FluxHASL-1
SolderingPreform Coating FluxNo-Clean & Water-SolubleSee Web PageSee Web PagePreform Coating FluxSee choices
SolderingCore FluxesFor making cored solder wireSee Web PageSee Web PageSolder Core FluxSee choices
BrazingSilver Brazing or Silver SolderWhite Flux PasteSilver-Bearing Braze Alloys (BAg), Phos-Copper (BCuP)565 - 870¡C 1050 - 1600¡FSilver Brazing White Paste FluxNo. 601
BrazingHi-Temp Silver Brazing"Black Flux" - Boron ModifiedSilver-Bearing Braze Alloys (BAg), Phos-Copper (BCuP)565 - 980¡C 1050 - 1800¡FHi-Temp Black Silver Brazing FluxNo. 601B/3411
BrazingCarbide BrazingFor large and small carbide partsNickel Braze Alloys760 - 1205¡C 1400 - 2200¡FCarbide Brazing FluxNo. 609LB, No. 612
BrazingAluminum BrazingTorch Brazing4047/718, 4145/716345 - 690¡C 650 - 1275¡FAluminum Brazing FluxNo. 20
BrazingAluminum BrazingControlled Atmosphere BrazingSilicon Aluminum580 - 610¡C 1076 - 1130¡FAluminum Brazing FluxNo. 1250
BrazingAluminum Bronze BrazingTorch BrazingSilver-Bearing Braze Alloys (BAg)580 - 610¡C 1076 - 1130¡FAluminum Bronze Brazing FluxNo. 625
BrazingFluoride-Free Brazing FluxTorch/Furnace BrazingSilver-Bearing Braze Alloys (BAg), Phos-Copper (BCuP)685 - 980¡C 1270 - 1800¡FFluoride-Free Brazing FluxNo. 650
BrazingBoric Acid Free Brazing FluxTorch/Furnace BrazingSilver-Bearing Braze Alloys (BAg), Phos-Copper (BCuP)485 - 870¡C 900 - 1600¡FBoric Acid Free Brazing FluxNo. 6, No. 601FP
BrazingBorate-Free Brazing FluxTorch/Furnace BrazingSilver-Bearing Braze Alloys (BAg), Phos-Copper (BCuP)485 - 870¡C 900 - 1600¡FBorate Free Brazing FluxNo. 670
BrazingLiquid Brazing FluxTorch/Furnace BrazingSilver-Bearing Braze Alloys (BAg), Phos-Copper (BCuP)590 - 870¡C 1095 - 1600¡FLiquid Brazing FluxNo. 25, No. 29
BrazingMagnesium Brazing FluxTorch, Oven, Induction BrazingMagnesium Brazing Alloys480 - 620¡C 900 - 1150¡FNo. 21
BrazingTitanium Brazing FluxTorch, Oven, Induction BrazingBAg 34650 - 760¡C 1200 - 1400¡FTitanium Brazing FluxTiBF-16
BrazingJewelry Brazing FluxBifluoride-FreeSilver-Bearing Braze Alloys (BAg), Phos-Copper (BCuP)485 - 870¡C 900 - 1600¡FJewelry Brazing FluxNo. 6
BrazingBronze Brazing Flux PowderLow Fuming BronzeBAg, BCu, BNi, BAu, RBCuZn760 - 1205¡C 1400 - 2200¡FBronze Brazing Powder FluxAnti-Borax No. 2
WeldingForge Welding Flux PowderFerrous Alloysn/aWelding TempsForge Welding Flux PowderSee selection.
WeldingCast Iron Welding FluxCast Ironn/a815 - 1540¡C 1500 - 2900¡FCast Iron Welding FluxAnti-Borax No. 1
WeldingStainless Steel Backup FluxStainless Steel, High-Chromium Ferrous & Low-Nickel Alloysn/a1090 - 1540¡C 2000 - 2900¡FStainless Steel Backup FluxNo. 9H
WeldingAluminum Welding FluxOxy-Acetlyne Torch1100-Series, Aluminum Filler Rod570 - 700¡C 1050 - 1300¡FAluminum Welding FluxAnti-Borax No. 8