Solder Wire Lead Free Flux & Alloy

Flux of lead-free cored solder wires

Flux name Flux classification Application Particular advantage
Gummix-HF
100% halide-free
REL0 Laser soldering Halide-free laser soldering
Gummix-19 NH
100% halide-free
REL0 Iron-tip soldering Flux stays flexible till -20°C
Gummix-21 NH
100% halide-free
REL0 Iron tip soldering flux stays flexible till -40°Cs
NHR-TH
100% halide-free
REL0 Iron tip soldering, Induction soldering TH solder joints
SRS-ZL REL0 Iron-tip soldering Also appropriate for drag soldering
Gummix-21 Zeta REL1 Laser soldering, Iron-tip soldering For low-silver alloys
Gummix-SB RMA REL1 Laser soldering, Iron-tip soldering High temperature stability
BT-19
stand / high SIR-value
ROL1 Iron-tip soldering, Induction soldering Standard components
SRS-RMA NC
(successor to SR-38)
chloride and bromine-free
ROL1 Iron tip soldering, Induction soldering TH solder joints
GTH-RMA ROL1 Iron-tip soldering Flux for low-melting indium alloys
Gummix-19 CH REM1 Laser soldering, Iron-tip soldering Surfaces which are difficult to wet
SR-37 REM1 Ron-tip soldering, Induction soldering Ni surface
SR-HS REM1 Drag soldering Fast wetting, low splattering
KR-19 ROM1 Iron-tip soldering, Drag soldering Ni surface, Stainless steel
SR-LA SUPER
(successor to SR-37)
ROM1 Iron-tip soldering, Induction soldering High soldering temperature possible
SRS-UL
chloride and bromine-free
ROM1 Iron-tip soldering, Induction soldering Optimized for low-silver alloys

All our lead-free solder wires are with the following flux-content available: 3,5%
Available on request: 2,5 and 4,5%
All our lead-free solder wires are available in the following diameters (mm):0.15, 0.2, 0.3, 0.38, 0.5, 0.65, 0.8, 1.0, 1.2, 1.6, 2.0, 2.7

lead-free solder wire alloys at a glance

Alloy Composition Melting range Special advantages
LFM-96 Sn-3,5Ag-0.5Bi-6.0In 200–210°C low-melting, highly reliable indium alloys
Sn-0.3Ag-0.7Cu-2.0Bi-0.035Fe 210–226°C anti tip-wastage, low AG, high solder joint strength
SJM-35 Sn-3.5Ag-2.0Bi 216–220°C high AG, high solder joint strength
SJM-30 Sn-0.3Ag-2.0Cu 217–270ºC minimizes Cu leaching
LFM-48 Sn-3.0Ag-0.5Cu 217–220ºC SAC, JEITA recommended
LFM-48 S Sn-3.0Ag-0.5Cu-0.04Fe 217–221ºC Anti tip-wastage, SAC, JEITA recommended
LFM-48 M Sn-3.0Ag-0.5Cu-0.03Fe-α 217–221ºC Anti tip-wastage and avoiding oxidation
LFM-90 Sn-1.0Ag-0.7Cu 217–224ºC low Ag
LFM-86 S Sn-0.3Ag-0.7Cu-0.04Fe 217–228ºC Anti tip-wastage, low Ag, SAC
LFM-41 Sn-0.3Ag-2.0Cu 217–270ºC Minimizes Cu leaching
LFM-41 S Sn-0.3Ag-2.0Cu-0.04Fe 217–271ºC Anti tip-wastage, minimizes Cu leaching
LFM-34 Sn-3.5Ag 221ºC Sn-Ag eutectic
SJM-40* Sn-4.0Ag-2.0Bi-3.0Sb-α 221–227ºC High AG, very high solder joint strength
LFM-22 Sn-0.7Cu 227ºC Sn-Cu eutectic
LFM-22 S Sn-0.7Cu-0.04Fe 228ºC Anti tip-wastage, Sn-Cu eutectic
LFM-23 S Sn-0.6Cu-0.05Ni-0.035Fe-Ga 228ºC Very high tip life time

*SJM-40 is patented under: JP PAT Nr. 3045453

Favored product combinations for Almit solder wire

Alloy Flux classification Laser soldering Iron-tip soldering Inductive soldering
LFM-48
(M&S)
(SAC305)
L0 Gummix-HF SRS-ZL Gummix-HF
L1 Gummix-SB RMA SRS-RMA Gummix-SB RMA
M1 Gummix-19 CH SR-37 SR-55
SJM-Series
(Sn, Ag, Cu, Bi)
L0 Gummix-HF NHR-TH Gummix-HF
L1 Gummix-21 Zeta SRS-RMA NC Gummix-21 Zeta
M1 Gummix-19 CH SR-LA Gummix-19 CH
LFM-23 S
(Sn, Cu, Ni)
L0 - SRS-ZL -
L1 Gummix-21 Zeta SRS-RMA NC Gummix-21 Zeta
M1 - SR-LA SUPER -