anyone used Brazetec 5507?

any good?

Not for boilers, methinks:

Base Material(s):
Any steel, copper and copper alloys, nickel and nickel alloys

Important Application(s):
For use where the operating temperature of the joint does not exceed 200°C

thats that then!

Sorry - thats not that then!

Somewhere in the depths of memory is a statement that "a silver solder will have lost 50% of its tensile strength at 33% of its solidus temperature" Does 50% of a large number exceed your test pressures? I believe it does!

You have been using successfully, a very similar product, 455, for years! They both conform to ISO 17672 Ag155! Boilers have remained intact and will do so. The biggest factor regarding joint strengths is the model engineer in so far as he controls joint design, heating techniques, and application of flux and alloy.

When you switched from cadmium bearing silver solder there was no compromise on joint strength. Joints are as strong now as they ever have been.

There are differences between the two products;

an understanding by its supplier of the needs of the model engineer as conveyed in their literature.

the availability of the alloy, by the rod, in small quantities to suit the model engineer and with relevant information.

The support by its' supplier to the model engineer.

455 is the better product

Keith

their site says that at 200 deg C there is NO loss in strength. Given that these are much cheaper than my regular rods I would still be pleased to hear from anone who has used them?

hi nigel,

the bottom line is what your club boiler inspector thinks!

i have a diminishing stock of easyflo cadmium bearing stuff from CupAlloys plus older J-M genuine easyflo, and plenty of J-M silverflo 55 and J-M silverfo 24. in the J-M data sheets/pdfs 55 and 24 are the only ones now recommended for copper silver soldering on miniature boilers post the cadmium ban due mainly to being ductile. ductility is very important in miniature loco boilers with silver soldered joints.

cheers,

julian

Edited By julian atkins on 01/11/2015 22:17:16

After big problems with the postal service it finally arrived 3 weeks late! I dont intend using 1mm dia for anything other than small fittings but im pleased to say it works, flows etc as good as the competition.