I'm looking for something that will not transfer heat very well so
something can be brazed on it without significant heat loss. Would
carbon fiber stand up to a MAPP torch?

Louis Ohland wrote:
I'm looking for something that will not transfer heat very well so
something can be brazed on it without significant heat loss. Would
carbon fiber stand up to a MAPP torch?

No, it would most likely catch fire.

On Wed, 26 Sep 2007 17:56:16 -0500, Louis Ohland
wrote:

I'm looking for something that will not transfer heat very well so
something can be brazed on it without significant heat loss. Would
carbon fiber stand up to a MAPP torch?


Hey Louis,

I would think the "fibers" will be OK, but the binder probably will
not unless it is special. I do know they make car intake manifolds
from carbon-fibre composition, so there must be some binder that
works.

Here in my shop, I have 5 or 6 firebricks for flatwork. For larger
stuff, like small boilers, setting as much of the part as possible in
a container of kitty-litter works good.

At work, we always used a piece of asbestos, either hard as in
Johns-Manville siding, or in blanket form that welders use, but that
was to keep any adjacent wood or wiring etc. from scorching or
catching fire.

Try a good plumbing or welding supply, and ask what the pro's use.

Brian Lawson,
Bothwell, Ontario.

I don't think Louis meant a laid-up resin cloth composit. I assumed he
meant the cloth itself--I used to use asbestos cloth as a heat shield, but,
of course, that's no longer considered acceptable. If you're going to buy
cloth, I would think glass cloth would be preferable. A few strands might
melt in a direct flame, but the stuff wouldn't catch fire. Carbon fibre is
carbon, is it not? Even diamond (also carbon) burns up in a fire.

Leo Lichtman wrote:
I don't think Louis meant a laid-up resin cloth composit. I assumed he
meant the cloth itself--I used to use asbestos cloth as a heat shield, but,
of course, that's no longer considered acceptable. If you're going to buy
cloth, I would think glass cloth would be preferable. A few strands might
melt in a direct flame, but the stuff wouldn't catch fire. Carbon fibre is
carbon, is it not? Even diamond (also carbon) burns up in a fire.



Yes, I mean just a woven carbon fiber blanket,
http://www.kbctools.com/usa/Navigati...fm?PDFPage=871

Torch Shield - carbon fiber fabric

Pyro Torch Shield
http://www.daggertools.com/m5_view_i...?m5:item=DT440
Description

Pyro torch shield, patented carbon fiber product, lightweight, soft &
flexible cloth 10" X 18" area. Will withstand temperatures up tp 3000°F
and is both fire and heat resistant. Protect paint, wood, plastic and
fiberglass from soldering or weld splatter. Great for repair jobs.



PYRO PROTECTIVE CARBON FIBER FLAME BLOCKERS
http://www.daggertools.com/uploaded/...oolspage33.pdf

Try Kevlar.
I use woven kevlar gloves for handling 500 degree metal, very short handling
times though.

fire brick
The cream foamy type.

Wood stove stores can help on a supplier or get some 'old' ones.

Martin
Martin H. Eastburn
@ home at Lions' Lair with our computer lionslair at consolidated dot net
TSRA, Life; NRA LOH & Patron Member, Golden Eagle, Patriot's Medal.
NRA Second Amendment Task Force Charter Founder
IHMSA and NRA Metallic Silhouette maker & member.
http://lufkinced.com/


Louis Ohland wrote:
I'm looking for something that will not transfer heat very well so
something can be brazed on it without significant heat loss. Would
carbon fiber stand up to a MAPP torch?

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On Sep 27, 12:41 am, "Leo Lichtman"
wrote:
I don't think Louis meant a laid-up resin cloth composit. I assumed he
meant the cloth itself--I used to use asbestos cloth as a heat shield, but,
of course, that's no longer considered acceptable. If you're going to buy
cloth, I would think glass cloth would be preferable. A few strands might
melt in a direct flame, but the stuff wouldn't catch fire. Carbon fibre is
carbon, is it not? Even diamond (also carbon) burns up in a fire.


Diamond is very resistant to burning. Not to say that it is not
possible, but I have reset diamonds in spelter ( molten zinc ) with no
noticeable affect on the diamond.


Dan

Heat isn't much - it might crack it due to mechanical issues.
Rich oxygen or hot rich oxygen will convert it to CO2 or CO.
Subliminally vaporize.

Martin
Martin H. Eastburn
@ home at Lions' Lair with our computer lionslair at consolidated dot net
TSRA, Life; NRA LOH & Patron Member, Golden Eagle, Patriot's Medal.
NRA Second Amendment Task Force Charter Founder
IHMSA and NRA Metallic Silhouette maker & member.
http://lufkinced.com/


wrote:
On Sep 27, 12:41 am, "Leo Lichtman"
wrote:
I don't think Louis meant a laid-up resin cloth composit. I assumed he
meant the cloth itself--I used to use asbestos cloth as a heat shield, but,
of course, that's no longer considered acceptable. If you're going to buy
cloth, I would think glass cloth would be preferable. A few strands might
melt in a direct flame, but the stuff wouldn't catch fire. Carbon fibre is
carbon, is it not? Even diamond (also carbon) burns up in a fire.


Diamond is very resistant to burning. Not to say that it is not
possible, but I have reset diamonds in spelter ( molten zinc ) with no
noticeable affect on the diamond.


Dan


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On Sep 26, 10:09 pm, " wrote:
On Sep 27, 12:41 am, "Leo Lichtman"
wrote:

I don't think Louis meant a laid-up resin cloth composit. I assumed he
meant the cloth itself--I used to use asbestos cloth as a heat shield, but,
of course, that's no longer considered acceptable. If you're going to buy
cloth, I would think glass cloth would be preferable. A few strands might
melt in a direct flame, but the stuff wouldn't catch fire. Carbon fibre is
carbon, is it not? Even diamond (also carbon) burns up in a fire.

Diamond is very resistant to burning. Not to say that it is not
possible, but I have reset diamonds in spelter ( molten zinc ) with no
noticeable affect on the diamond.

Dan

Do you know one of the most amazing properties of diamond?
It transfers heat better than any other known material. About X times
better than copper!
Hard to beleive?
Diamond is the hardest material.
Diamond is the best electrical insualtor. (reference needed)
Diamond has the best heat transfer properties.

In fact, the Cray Supercomputers used to have diamond paste spread
under the chips to transfer heat to the heat exchangers. Cost was NO
object!

The heat transfer is a artifact of being a hard material. Heat is
vibrational energy.
Hard material transfers the (?) sonons better than a softer material.

Just go get the product designed for soldering copper pipe in plumbing
section at a hardware store. It's usualy fiberfrax with a AL backing.
I made an electric brass melting furnace using the commercial stuff as
insulation instead of refractory.
Karl


On Sep 26, 12:56 pm, Louis Ohland wrote:
I'm looking for something that will not transfer heat very well so
something can be brazed on it without significant heat loss. Would
carbon fiber stand up to a MAPP torch?

wrote:
Just go get the product designed for soldering copper pipe in plumbing
section at a hardware store. It's usualy fiberfrax with a AL backing.
I made an electric brass melting furnace using the commercial stuff as
insulation instead of refractory.
Karl


On Sep 26, 12:56 pm, Louis Ohland wrote:
I'm looking for something that will not transfer heat very well so
something can be brazed on it without significant heat loss. Would
carbon fiber stand up to a MAPP torch?



Alpha Metals Non-Asbestos Flame Protector through Ace Hardware

In article . com,
Half-Nutz wrote:

On Sep 26, 10:09 pm, " wrote:
On Sep 27, 12:41 am, "Leo Lichtman"
wrote:

I don't think Louis meant a laid-up resin cloth composit. I assumed he
meant the cloth itself--I used to use asbestos cloth as a heat shield,
but,
of course, that's no longer considered acceptable. If you're going to
buy
cloth, I would think glass cloth would be preferable. A few strands
might
melt in a direct flame, but the stuff wouldn't catch fire. Carbon fibre
is
carbon, is it not? Even diamond (also carbon) burns up in a fire.

Diamond is very resistant to burning. Not to say that it is not
possible, but I have reset diamonds in spelter ( molten zinc ) with no
noticeable affect on the diamond.

Dan

Do you know one of the most amazing properties of diamond?
It transfers heat better than any other known material. About X times
better than copper!
Hard to beleive?
Diamond is the hardest material.
Diamond is the best electrical insualtor. (reference needed)

Best insulator? Not sure this is true, compared to say teflon.

Joe Gwinn


Diamond has the best heat transfer properties.

In fact, the Cray Supercomputers used to have diamond paste spread
under the chips to transfer heat to the heat exchangers. Cost was NO
object!

The heat transfer is a artifact of being a hard material. Heat is
vibrational energy.
Hard material transfers the (?) sonons better than a softer material.

In article . com,
Half-Nutz wrote:

On Sep 26, 10:09 pm, " wrote:
On Sep 27, 12:41 am, "Leo Lichtman"
wrote:

I don't think Louis meant a laid-up resin cloth composit. I assumed he
meant the cloth itself--I used to use asbestos cloth as a heat shield,
but,
of course, that's no longer considered acceptable. If you're going to buy
cloth, I would think glass cloth would be preferable. A few strands might
melt in a direct flame, but the stuff wouldn't catch fire. Carbon fibre
is
carbon, is it not? Even diamond (also carbon) burns up in a fire.

Diamond is very resistant to burning. Not to say that it is not
possible, but I have reset diamonds in spelter ( molten zinc ) with no
noticeable affect on the diamond.

Dan

Do you know one of the most amazing properties of diamond?
It transfers heat better than any other known material. About X times
better than copper!
Hard to beleive?
Diamond is the hardest material.
Diamond is the best electrical insualtor. (reference needed)
Diamond has the best heat transfer properties.

You forgot refractive index! Diamond makes great lenses!


In fact, the Cray Supercomputers used to have diamond paste spread
under the chips to transfer heat to the heat exchangers. Cost was NO
object!

The heat transfer is a artifact of being a hard material. Heat is
vibrational energy.
Hard material transfers the (?) sonons better than a softer material.

On Sat, 29 Sep 2007 00:35:45 -0400 in rec.crafts.metalworking,
JoanD'arcRoast wrote,
You forgot refractive index! Diamond makes great lenses!

You forgot dispersion. Diamond makes great lenses if your light is
monochromatic.