On 14 Feb, 09:20, Lobster wrote:

the only obvious difference being

The first is just a drip mat. It's proof against solder, but it's not
going to insulate anything.

If you're using an electric iron, then a drip mat is adequate. If
you're using a gas flame or hot air, or if you're getting the
workpiece hot enough that radiant heat is a problem, then you need the
real thing.

Mine is a couple of layers of Kevlar, with an outer layer of Nomex
(worn-out fireproof boiler suit) on each side. The Kevlar is a loose
weave, so not flame proof.