"Arfa Daily" wrote in message
...

I've seen this stuff too. I think it's called Wood's Metal. I don't know
what actual metals make up the alloy though. Two places I know that they
use it are as the safety plug in a pressure cooker lid, and as the
hold-off bar in fire sprinkler systems, both cases where a very low
melting temperature is required.

IIRC it's also used for some molding processes - and in the toy "Metal
Molder".