On Mon, 17 Aug 2020 19:11:34 +0100, Andy Burns
wrote:

Cursitor Doom wrote:

The ones I have actually *look* like really nice quality. They have
quite thick, substantial ceramic cases to contain any flames or hot
gases. I cracked a couple open to see inside.

was there sand?

Nope. And AFAIC in this type of fuse of that rating, there normally
isn't any in any case.