I need to fill a few draught holes where the CH pipes come through the
ceiling (bungalow). The sheds don't seem to list the upper temp of their
silicone sealants.
TIA.

"brass monkey" wrote in message
...
I need to fill a few draught holes where the CH pipes come through the
ceiling (bungalow). The sheds don't seem to list the upper temp of their
silicone sealants.
TIA.

It withstands the 100C plus temperature of the engine sumps and other engine
parts I've used it on for 20 years.
--
Dave Baker

In article , brass monkey
writes
I need to fill a few draught holes where the CH pipes come through the
ceiling (bungalow). The sheds don't seem to list the upper temp of their
silicone sealants.

Bog standard silicone sealant should be good for 120degC, some go to 200
& high temperature rated goes to 300degC.

Watch put for acrylic sealant pretending to be silicone which may not be
rated above 80 and specialist silicone, I've just seen some for glazing
that they say is only good to 50.

The benefit of the acrylic would be that it is paintable, whereas
silicone is not.
--
fred
BBC3, ITV2/3/4, channels going to the DOGs

"brass monkey" wrote in message
...
I need to fill a few draught holes where the CH pipes come through the
ceiling (bungalow). The sheds don't seem to list the upper temp of their
silicone sealants.

I use silicone rubber kitchen bakeware and they can be baked at 220C without
problems.

brass monkey wrote:
I need to fill a few draught holes where the CH pipes come through the
ceiling (bungalow). The sheds don't seem to list the upper temp of their
silicone sealants.
TIA.


Temp no prob but acrylic sealer - decorators caulk - is better. It paints!

Use high temperature silicone to be on the safe side. You'll have to
go to a plumbers merchant rather than B&Q to get it.

In article ,
Dave Baker wrote:

"brass monkey" wrote in message
...
I need to fill a few draught holes where the CH pipes come through the
ceiling (bungalow). The sheds don't seem to list the upper temp of
their silicone sealants. TIA.

It withstands the 100C plus temperature of the engine sumps and other
engine parts I've used it on for 20 years.

My local exhaust place uses it - I suppose a special high temperature
version? They said it was quite expensive, but far better than any other
exhaust sealer. Although I'd always thought a good exhaust properly fitted
with the correct gaskets etc wouldn't need sealer.

--
*To be intoxicated is to feel sophisticated, but not be able to say it.

Dave Plowman London SW
To e-mail, change noise into sound.

"Dave Plowman (News)" wrote in message
...
In article ,
Dave Baker wrote:

"brass monkey" wrote in message
...
I need to fill a few draught holes where the CH pipes come through the
ceiling (bungalow). The sheds don't seem to list the upper temp of
their silicone sealants. TIA.

It withstands the 100C plus temperature of the engine sumps and other
engine parts I've used it on for 20 years.

My local exhaust place uses it - I suppose a special high temperature
version? They said it was quite expensive, but far better than any other
exhaust sealer. Although I'd always thought a good exhaust properly fitted
with the correct gaskets etc wouldn't need sealer.

Silicone sealant is the in-thing for exhaust systems nowadays. Everyone who
tries it swears by it. I never got on very well with those old exhaust
pastes and putties you could buy anyway. They set rock hard and then just
chip off. I never managed to cure a leak at a sleeve joint with them. Their
main effect seems to be just to make it impossible to dismantle anything
again.

Normal DIY silicone will withstand at least 100C if it's the low modulus
stuff and up to 200C if it's the high modulus acetoxy cure type so any of
them are fine for hot water heating systems or general engine gaskets like
sumps and rocker covers. High temp RTV usually runs from about 260C up to as
much as 350C. It is expensive though. A 310 ml tube of ordinary domestic
silicone is about 3 quid and if you buy enough of it maybe as low as £1.25
or so. A 95g tube of high temp sealant is over a fiver so about six times
the price per gram. It's still a lot cheaper than buying the gaskets though.
I think the shim gasket for the joint between the manifold and cat on my
Focus is £6 from Ford for a wafer thin bit of metal about 4 inches square.
Sod that for a game of soldiers.

Luckily I have a mate who works in a huge industrial complex, I'd better not
say which one, and they seem to have a need to stock just about every type
of industrial consumable you could ever imagine. Loctite in various grades,
greases, gloves, goggles, WD40 to name a few of the things he's acquired for
me. The last delivery was a tube of Loctite 598 catalyst safe high temp RTV
silicone because I have to change my exhaust manifold soon. It's listed to
be ok up to 260C but apparently doesn't mind the fact that exhausts get much
hotter than that.

Dave Baker wrote:
"brass monkey" wrote in message
...
I need to fill a few draught holes where the CH pipes come through the
ceiling (bungalow). The sheds don't seem to list the upper temp of their
silicone sealants.
TIA.

It withstands the 100C plus temperature of the engine sumps and other engine
parts I've used it on for 20 years.

If I remember rightly, it will stand temps up to about 300 C.

Dave

In message , Dave
writes
Dave Baker wrote:
"brass monkey" wrote in message
.. .
I need to fill a few draught holes where the CH pipes come through
the ceiling (bungalow). The sheds don't seem to list the upper temp
of their silicone sealants.
TIA.
It withstands the 100C plus temperature of the engine sumps and
other engine parts I've used it on for 20 years.

If I remember rightly, it will stand temps up to about 300 C.

There is no single silicone sealant, the stuff you use to seal a bath is
completely different to that which is used for gaskets

If you get some high modulus silicone from a central heating merchant,
it should withstand the temperature


--
geoff

geoff wrote:
In message , Dave
writes
Dave Baker wrote:
"brass monkey" wrote in message
...
I need to fill a few draught holes where the CH pipes come through
the ceiling (bungalow). The sheds don't seem to list the upper temp
of their silicone sealants.
TIA.
It withstands the 100C plus temperature of the engine sumps and
other engine parts I've used it on for 20 years.

If I remember rightly, it will stand temps up to about 300 C.

There is no single silicone sealant, the stuff you use to seal a bath is
completely different to that which is used for gaskets

If you get some high modulus silicone from a central heating merchant,
it should withstand the temperature

Many thanks for that. I am used to working in the aerospce industry
usung Dow Coring stuff. RTV etc.

Dave

In message , Dave
writes
geoff wrote:
In message , Dave
writes
Dave Baker wrote:
"brass monkey" wrote in message
...
I need to fill a few draught holes where the CH pipes come through
the ceiling (bungalow). The sheds don't seem to list the upper
temp of their silicone sealants.
TIA.
It withstands the 100C plus temperature of the engine sumps and
other engine parts I've used it on for 20 years.

If I remember rightly, it will stand temps up to about 300 C.

There is no single silicone sealant, the stuff you use to seal a bath
is completely different to that which is used for gaskets
If you get some high modulus silicone from a central heating
merchant, it should withstand the temperature

Many thanks for that. I am used to working in the aerospce industry
usung Dow Coring stuff. RTV etc.

Glueing eurofighters together ?

Just get some high mod silicone from a CH merchant

.... I cannot believe that Dow Corning do not publish data sheets for
silicone used in aerospace applications

Smuggle some out between your bum cheeks - just tell them that you've
been playing squash

--
geoff

"geoff" wrote in message
...
Many thanks for that. I am used to working in the aerospce industry usung
Dow Coring stuff. RTV etc.

Glueing eurofighters together ?

Just get some high mod silicone from a CH merchant

There's no silicone sealant ever made that can't withstand the sub 100C
temperatures of a domestic hot water system. Low modulus, high modulus,
cheap, dear, clear, coloured - they'll all cope with at least 100C. Given
the caution the manufacturers will display in their spec sheets to avoid
being sued you can bank on them coping with a lot more than that too as I've
found over the years with engines. Oil temps and therefore block and sump
temps exceed 100C by a considerable margin but no silicone sealant I've ever
used has failed to work other than perfectly reliably in such an environment
and I've only ever used cheap standard domestic stuff for £3 a tube rather
than the many times dearer automotive types.
--
Dave Baker

geoff wrote:

Glueing eurofighters together ?

No they were taken out of the hands of the long standing team of
develoment and given to the yes men and a new department was formed as a
result.

I have worked on Lightnings, Jaguars, Victor tankers, Canbera PRA, Hawks
and otheres that I can't mention. This is where I learned about bonding
and various bonding substances.

Dave

Dave Baker wrote:
"geoff" wrote in message
...
Many thanks for that. I am used to working in the aerospce industry usung
Dow Coring stuff. RTV etc.

Glueing eurofighters together ?

Just get some high mod silicone from a CH merchant

There's no silicone sealant ever made that can't withstand the sub 100C
temperatures of a domestic hot water system. Low modulus, high modulus,
cheap, dear, clear, coloured - they'll all cope with at least 100C. Given
the caution the manufacturers will display in their spec sheets to avoid
being sued you can bank on them coping with a lot more than that too as I've
found over the years with engines. Oil temps and therefore block and sump
temps exceed 100C by a considerable margin but no silicone sealant I've ever
used has failed to work other than perfectly reliably in such an environment
and I've only ever used cheap standard domestic stuff for £3 a tube rather
than the many times dearer automotive types.

I have to agree with you here. The silicone I worked with had an upper
temp of about 300 to 350 degree C before it broke down.


Dave

In message , Dave
writes
geoff wrote:

Glueing eurofighters together ?

No they were taken out of the hands of the long standing team of
develoment and given to the yes men and a new department was formed as
a result.


'Kin good ACS on them, though

(insert smiley here)


I have worked on Lightnings, Jaguars, Victor tankers, Canbera PRA,
Hawks and otheres that I can't mention.

The fighter who shall not be named

This is where I learned about bonding and various bonding substances.

Outward bound course, eh ?

--
geoff

geoff wrote:
In message , Dave
writes
geoff wrote:

Glueing eurofighters together ?

No they were taken out of the hands of the long standing team of
develoment and given to the yes men and a new department was formed as
a result.


'Kin good ACS on them, though

(insert smiley here)


I have worked on Lightnings, Jaguars, Victor tankers, Canbera PRA,
Hawks and otheres that I can't mention.

The fighter who shall not be named

Stealth?

Dave