go to the page above this one – soldering/brazing 

Solders and fluxes – suppliers

There are several suppliers who will supply silver solders and fluxes in small amounts as used by model engineers.

It seems probable that all silver solders and their fluxes are ultimately made by Johnson Matthey. Silver solders made by Johnson Matthey containing cadmium are no longer available to the general public.

 primarily suppliers to model engineers

AJ Reeves

Cup alloys

Primarily suppliers to jewellery makers, silversmiths, etc.

Cookson Gold

Walsh

From AJ Reeves

made by Johnson Matthey

Silver solders

Silver-flo    24   740-800

Silver-flo   55    630-660

Brazing rod

Sifbronze

Soft solders

Comsol            305

Soft solder  183-190

fluxes

Sif flux

Easy flo flux

Tenacity 4A

Tenacity 5A

From Fry’s

Fluxes

Powerflow flux

Fluxite

Fryolux solder paint

From Baker’s

soft soldering fluid

From CuP Alloys

 

None are for hallmarked silver

Probably Johnson Matthey

CuP alloys name                               silver       temp range              Johnson Matthey name

Low temp silver solder 455              55%        63-660                     Silver-flo 55

Medium temp silver solder 430       30%        650-750                   Silver-flo 302

Medium temp silver solder 434       34%        630-730                   Silver-flo 34

Medium temp silver solder  438      38%        650-720                   Silver-flo 38

Medium temp silver solder 440       44%        650-710                   Silver-flo 40

High temp silver solder    418          18%        776-815

High temp silver solder  424            24%        740-800                   Silver-flo  24

 

 

 

From Cookson Gold

from Johnson Matthey

                    JM name                                          silver                     melting range                       Cookson name

Silver-flo     55                                 55%                      630-660                                Silver-flo 55                       not for hallmarked silver

The following are for hallmarked silver

Silver-flo      67      Extra Easy       67%                      667-709                                Extra easy

Silver-flo      67      Easy                 67                          705-723                               Easy

Silver-flo      67      Hard                 67                          745-778                               Hard

Silver-flo      74.1  Medium           74.1                       720-765                               Medium

Silver-flo      81      Enamelling     81                          730-800                               Enamelling

From Walsh

JM name                                          silver                     melting range                      Walsh name

The following are for hallmarked silver

Silver-flo      67      Extra Easy       67%                      667-709                                Extra easy

Silver-flo      67      Easy                 67                          705-723                               Easy

Silver-flo      67      Hard                 67                          745-778                               Hard

Silver-flo      74.1  Medium           74.1                       720-765                               Medium

Silver-flo      81      Enamelling     81                          730-800                               Enamelling