Diazed fuses, what metal here?

[fabriciomnarvaez]

Good afternoon friends, I got these delayed fuses, and inside them there are two wires, can anyone say which metal they are?

 

[Yggdrasil]

Good afternoon friends, I got these delayed fuses, and inside them there are two wires, can anyone say which metal they are?

It may have Silver in it but most likely not.

 

[Christian333]

Good afternoon friends, I got these delayed fuses, and inside them there are two wires, can anyone say which metal they are?

Add a drop of bleach to it, let set 10 min., wipe off and observe for dark oxidation stain, indicating silver.

Janie

 

[fabriciomnarvaez]

The caps do not contain precious metals, the wires did not dissolve in nitric acid, now I put it in Aqua Regia, and it is slowly dissolving. I'll be back later with more information...

 

[Alondro]

Always try such wires in HCl first. If they dissolve in HCl, then they have no value. Nitric SECOND. Aluminum wires, for instance, will not dissolve in nitric because of the formation of impermeable aluminum nitride. But Al will dissolve RAPIDLY in HCl.

NO PMs will dissolve in HCl alone, and HCl is cheap. Therefore, it's the best first test to make.

 

[fabriciomnarvaez]

Sempre experimente primeiro esses fios em HCl. Se eles se dissolverem em HCl, não terão valor. Nítrico SEGUNDO. Os fios de alumínio, por exemplo, não se dissolvem em nítrico devido à formação de nitreto de alumínio impermeável. Mas o Al se dissolverá RAPIDAMENTE em HCl.

NENHUM PM se dissolverá apenas em HCl, e o HCl é barato. Portanto, é o melhor primeiro teste a ser feito.

Hello my friend, HCL is the first acid used, no react

 

[Alondro]

Hello my friend, HCL is the first acid used, no react

It might just be tungsten, if these are high-capacity fuses. Tungsten is ALSO very acid-resistant.

 

[Findm-Keepm]

Usually, the fusible link in those is silver (Ag 1%) bearing alloy, very similar to silver bearing solder. NOT Silver solder, silver bearing. Tin-Bismuth-Silver is most common. The fuse element inside needs to melt at a predictable amperage, and be lead and cadmium free. The silver is typically used to offset the unwanted properties of tin, like tin whiskers and tin "poisoning" - where the tin loses it's preferred properties rapidly in some alloys.
The fuses wholesale for $3-4 USD each, and I can't see much PM value in any variety of the DIAZED (milk bottle fuses). I've only seen them used in industrial machinery, mostly German-made stuff. Siemens made the most of the ones I've seen.