On Mon, 10 Dec 2018 12:29:08 -0000, Tim Lamb
wrote:

Umm.. Cement bonded asbestos roofing *explodes* when heated. My
assumption is that this is due to steam from trapped water.

I don't know why it explodes but as kids we would seek out the dimpled
bits of cement bonded asbestos panels to chuck on the bonfire.

AJH

On 10/12/2018 11:42, dennis@home wrote:
On 10/12/2018 10:25, Rod Speed wrote:


wrote in message
...

ISTR asbestos cement explodes in a fire.

No it does not.

Yes it does.

My experience is that back in the 1970s a school lab asbestos mat for
Bunsens makes quite a satisfactory bang if placed _above_ the burner.

Andy

On Thursday, 13 December 2018 21:52:58 UTC, Vir Campestris wrote:
On 10/12/2018 11:42, dennis@home wrote:
On 10/12/2018 10:25, Rod Speed wrote:
tabbypurr wrote in message
...

ISTR asbestos cement explodes in a fire.

No it does not.

Yes it does.

My experience is that back in the 1970s a school lab asbestos mat for
Bunsens makes quite a satisfactory bang if placed _above_ the burner.

Andy

I've never known asbestos mats to be bothered by direct torch flame. Unlike asbestos cement.


NT

On 13/12/2018 22:54, wrote:
On Thursday, 13 December 2018 21:52:58 UTC, Vir Campestris wrote:
On 10/12/2018 11:42, dennis@home wrote:
On 10/12/2018 10:25, Rod Speed wrote:
tabbypurr wrote in message
...

ISTR asbestos cement explodes in a fire.

No it does not.

Yes it does.

My experience is that back in the 1970s a school lab asbestos mat for
Bunsens makes quite a satisfactory bang if placed _above_ the burner.

Andy

I've never known asbestos mats to be bothered by direct torch flame. Unlike asbestos cement.

I've seen shrapnel expelled from a asbestos mat with a thickness around
5mm. The simplest explanation is absorbed water expanding into steam.

The asbestos 'gauze mats' are much thinner, reinforced with steel and
don't seem to exhibit any such issues.

On Thursday, 13 December 2018 23:09:25 UTC, Fredxx wrote:
On 13/12/2018 22:54, tabbypurr wrote:
On Thursday, 13 December 2018 21:52:58 UTC, Vir Campestris wrote:
On 10/12/2018 11:42, dennis@home wrote:
On 10/12/2018 10:25, Rod Speed wrote:
tabbypurr wrote in message
...

ISTR asbestos cement explodes in a fire.

No it does not.

Yes it does.

My experience is that back in the 1970s a school lab asbestos mat for
Bunsens makes quite a satisfactory bang if placed _above_ the burner.

Andy

I've never known asbestos mats to be bothered by direct torch flame. Unlike asbestos cement.

I've seen shrapnel expelled from a asbestos mat with a thickness around
5mm. The simplest explanation is absorbed water expanding into steam.

Surely you mean asbestos cement there. I don't see how that's possible with a floppy mat.

The asbestos 'gauze mats' are much thinner, reinforced with steel and
don't seem to exhibit any such issues.


NT

On 13/12/2018 22:54, wrote:
I've never known asbestos mats to be bothered by direct torch flame. Unlike asbestos cement.

Pretty sure these were cement. The hard ones you were supposed to put on
the bench to protect it, not the little ones intended as heat spreaders
on top of the tripod.

Andy