Silicone sealant and LHM
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- Dommo
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Silicone sealant and LHM
Hi folks
Does LHM react with typical silicone sealant, bathroom sealant type stuff?
Cheers!
Does LHM react with typical silicone sealant, bathroom sealant type stuff?
Cheers!
I wouldn`t think so. Only thing that eats silicone is the removers you get from Screwfix etc. It`s a very stable material that takes heat, oil the lot.
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Not quite !
Silicone generally does not resist long term exposure to mineral oil. However , there are special grades that are intended for use with oil , these will be the types that are used for gasket making , engine sealants etc.
Unless the type of bathroom sealer you are using specifically states that it will resist oil , it won't !
Silicone generally does not resist long term exposure to mineral oil. However , there are special grades that are intended for use with oil , these will be the types that are used for gasket making , engine sealants etc.
Unless the type of bathroom sealer you are using specifically states that it will resist oil , it won't !
Now using '00 Xantia LX HDI, pov spec
My past Citroens :-
'00 Xantia SX HDI, now dead due to accident
'99 Xantia HDI 110 Exclusive, RIP
'97 Xantia TD SX
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'96 ZX TD
'89 BX TD
'88 AX GT
'79 CX2400 Pallas (scrapped )
& a couple of Peugeots !
My past Citroens :-
'00 Xantia SX HDI, now dead due to accident
'99 Xantia HDI 110 Exclusive, RIP
'97 Xantia TD SX
'96 Xantia TD LX
'96 ZX TD
'89 BX TD
'88 AX GT
'79 CX2400 Pallas (scrapped )
& a couple of Peugeots !
Basically there are only two real types of Silicone in this world. High modulous and low modulous. They have two different BS numbers and are put into a thousand different named tubes. Proper high mod silicone for bathrooms is basically the same type of rubber with a Fungicide to kill mould and not yellow.
Make sure you don`t use general "bathroom sealer" make sure it is silicone and not cheap acrylic water base
I have used ordinary silicone for rocker cover gaskets and many other engine uses etc for years.........no probs. Not saying that a special product wont work under more extreme circumstances...........it might and then again it could just be "snake oil" in some circumstances with a price tag to boot.
Try boiling some silicone in Lhm for a " Look Around You " type project
Make sure you don`t use general "bathroom sealer" make sure it is silicone and not cheap acrylic water base
I have used ordinary silicone for rocker cover gaskets and many other engine uses etc for years.........no probs. Not saying that a special product wont work under more extreme circumstances...........it might and then again it could just be "snake oil" in some circumstances with a price tag to boot.
Try boiling some silicone in Lhm for a " Look Around You " type project
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- Dommo
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I'll be honest with you I've not got a clue, and I'm not sure of its smell, it's been sat in a tube in my garage for a long while, my brother bought and used some of it years ago.
If I've not got any in the garage would I basically be looking for some silicone instant gasket type stuff that says resistant to oil? I used some blue stuff on a sump recently, would that be LHM resistant?
Cheers.
If I've not got any in the garage would I basically be looking for some silicone instant gasket type stuff that says resistant to oil? I used some blue stuff on a sump recently, would that be LHM resistant?
Cheers.
- Paul-R
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Ordinary household silicone sealants (including the fungicidal type) react with water vapour and give off acetic acid. This is the vinegar smell that you get.
The proper gasket type silone sealant does NOT give off acetic acid. This is because it's generally not a good idea to mix acids with metal. Especially if it's held in close contact by the silicone itself.
I was under the impression that modulus was to do with the "slumpability" of a product, i.e. it's ability not to fall off when applied in largish amounts. A low modulus sealant will fill small cracks and gaps but a high modulus sealant wil bridge a large gap.
The proper gasket type silone sealant does NOT give off acetic acid. This is because it's generally not a good idea to mix acids with metal. Especially if it's held in close contact by the silicone itself.
I was under the impression that modulus was to do with the "slumpability" of a product, i.e. it's ability not to fall off when applied in largish amounts. A low modulus sealant will fill small cracks and gaps but a high modulus sealant wil bridge a large gap.
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The acetic acid is normally present in the high modulous type. These are harder when cured, set faster and have slightly less "give". Where you shouldn't use this stuff is around joints that will have lots of thermal movement. ie. plastic window frames. THAT is a job for Low Modulous. This is now the different BS number and the proper ones have no acetic acid smell and cure to a joint which is more flexible........these types can be used in structural building joints up to 20mm wide.
Other no no`s for the high mod acetic acid stuff? Don`t use it on the back of a mirror to glue to a wall........the acid can eat through and damage mirror.
Don`t use when making a fish tank as it can kill fish if not cured properly.
These are jobs for Low mod. Adam makes a good point about actual contact area in joints.....miniscual. Also when bolted down the movement issue is nothing. My guess is that small tubes of silicone gasket stuff like RTV etc are probably low or high mod without the acetic acid production. I use Sikaflex on lots of stuff around a car also.That is a Polyurethane of high quality and differing grades of modulous (stiffness) that are recognisable by the number type on tube.
The acetic acid is normally present in the high modulous type. These are harder when cured, set faster and have slightly less "give". Where you shouldn't use this stuff is around joints that will have lots of thermal movement. ie. plastic window frames. THAT is a job for Low Modulous. This is now the different BS number and the proper ones have no acetic acid smell and cure to a joint which is more flexible........these types can be used in structural building joints up to 20mm wide.
Other no no`s for the high mod acetic acid stuff? Don`t use it on the back of a mirror to glue to a wall........the acid can eat through and damage mirror.
Don`t use when making a fish tank as it can kill fish if not cured properly.
These are jobs for Low mod. Adam makes a good point about actual contact area in joints.....miniscual. Also when bolted down the movement issue is nothing. My guess is that small tubes of silicone gasket stuff like RTV etc are probably low or high mod without the acetic acid production. I use Sikaflex on lots of stuff around a car also.That is a Polyurethane of high quality and differing grades of modulous (stiffness) that are recognisable by the number type on tube.
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Silicone sealants intended for oil applications are a different formulation , similar to fluro silicones which have total resistance to oil and fuel. Although the area exposed to oil in the assembled joint is minimal , the problem is that any excess extruded from the joint will be more likely to break away and cause a problem if it's a non oil resisting type.
Now using '00 Xantia LX HDI, pov spec
My past Citroens :-
'00 Xantia SX HDI, now dead due to accident
'99 Xantia HDI 110 Exclusive, RIP
'97 Xantia TD SX
'96 Xantia TD LX
'96 ZX TD
'89 BX TD
'88 AX GT
'79 CX2400 Pallas (scrapped )
& a couple of Peugeots !
My past Citroens :-
'00 Xantia SX HDI, now dead due to accident
'99 Xantia HDI 110 Exclusive, RIP
'97 Xantia TD SX
'96 Xantia TD LX
'96 ZX TD
'89 BX TD
'88 AX GT
'79 CX2400 Pallas (scrapped )
& a couple of Peugeots !
Whenever the word Fluro comes up I smile. Many tests have been done on "flurocarbon" fishing line and basically they are a rip off in price and what they are supposed to be in the actual term fluro. Some tests said it was line with soap on it.
Afaik there are no fluro silicones in a tube. I think they are manufacturer extruded into shape?
Rubbers are interesting
Afaik there are no fluro silicones in a tube. I think they are manufacturer extruded into shape?
Rubbers are interesting
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- Dommo
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99 306 - x 19
Basically the rear ram on my Activa is weeping slightly, one drip every few minutes or so when running. But probably enough for mr MOT man to fail it I would imagine. Basically I want to get it through it's MOT then save up for a new rear ram in the near future, at the moment it seems stupid to buy a ram for such a tiny amount of leakage.
I think that providing a better seal around the bottom of the ram gaiter would stop it leaking, possibly only in the short term, but possibly long term too.
I'll have to admit, I'm very confused about the info in this thread! For the bottom of the ram gaiter are we suggesting that I'm best off with low modulus?
I have some stuff that apparantly doesn't 'set', but says it's suitable for water pumps, oil sump pans, rocker covers, etc. Does that suggest it's LHM suitable??
I've also got some blue stuff that I used specifically on a sump pan and it did have the vinegar smell, and it set into a hard rubbery consistancy.
Has anyone used any specific products with LHM? If so what is the suggested one to use?
Thanks and sorry for asking the same questions over and over
Dom.
I think that providing a better seal around the bottom of the ram gaiter would stop it leaking, possibly only in the short term, but possibly long term too.
I'll have to admit, I'm very confused about the info in this thread! For the bottom of the ram gaiter are we suggesting that I'm best off with low modulus?
I have some stuff that apparantly doesn't 'set', but says it's suitable for water pumps, oil sump pans, rocker covers, etc. Does that suggest it's LHM suitable??
I've also got some blue stuff that I used specifically on a sump pan and it did have the vinegar smell, and it set into a hard rubbery consistancy.
Has anyone used any specific products with LHM? If so what is the suggested one to use?
Thanks and sorry for asking the same questions over and over
Dom.
Sorry for confusion mate We were chewing the fat a bit there. If you are in doubt about all this why not go and buy a dedicated Silicone job like this?
http://www.halfords.com/webapp/wcs/stor ... yId_165691
Whadya think?
Always keep asking on the forum till you get the answer.....or until you are sure nobody knows
http://www.halfords.com/webapp/wcs/stor ... yId_165691
Whadya think?
Always keep asking on the forum till you get the answer.....or until you are sure nobody knows
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