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Model Forum / General / Models / March 2009How to stop RTV going off in the tin ?
Hi, I bought some RTV a while ago and it went off in the tin. I did not notice that it only has a 6 month shelf life and before I buy a replacement I wondered if there is any practical way of prolonging it's shelf life ? (Like eg by refridgerating or freezing it ?) Thanks, Mike > Hi, > [quoted text clipped - 6 lines] > > Mike It's a chemical reaction so putting in the 'fridge or freezer will slow it down - it may have a lower storage temperature limit though so read the literature AWEM >> I bought some RTV a while ago and it went off in the tin. I did not >> notice that it only has a 6 month shelf life and before I buy a [quoted text clipped - 8 lines] >slow it down - it may have a lower storage temperature limit though so >read the literature I just happened to be reading the notes from Tiranti on RTV at the weekend and in them they suggested that the shelf life could be extended to about a year using refrigeration. I don't have the book to hand right now, but I think I remember the words "may" and "might" being used, so twelve months might be an optimistic maximum shelf life. Jim. > On Tue, 24 Mar 2009 19:32:25 -0000, "Andrew Mawson" > [quoted text clipped - 20 lines] > > Jim. What is this 'RTV' in a tin? The only RTV I know of is Room Temperature Vulcanising silicone sealant, eg the stuff you might put round a bath or sink, comes in a gun cartridge. Are we talking about the same stuff? Tim >The only RTV I know of is Room Temperature Vulcanising silicone >sealant, eg the stuff you might put round a bath or sink, comes in a >gun cartridge. Are we talking about the same stuff? There is another type that comes as two parts and sets on mixing. That's the stuff that Tiranti supply in several varieties. The bath seal type takes ages to set in a mould but is available in smaller cheaper quantities. Just needs lots of patience! Henry Thanks to all for the answers. I will try the next lot in the fridge. Mike >Thanks to all for the answers. I will try the next lot in the fridge. > >Mike Just make sure no-one mistakes it for mayonnaise - it would add a whole new meaning to the expression "my lips are sealed" <G> Regards, Tony > The bath seal type takes ages to set in a mould but is available in smaller > cheaper quantities. > Just needs lots of patience! Are you saying the bath seal type be used as a casting medium as well as the Tiranti stuff ? That would be a whole lot easier from my pov as I would be able to pop out and buy small amounts as and when required instead of ordering it by the tin over the internet. Can you suggest brand names suitable for white metal casting for me ? Thanks, Mike On 25 Mar, 12:13, mikedavies4...@ymail.com wrote: > > The bath seal type takes ages to set in a mould but is available in smaller > > cheaper quantities. [quoted text clipped - 9 lines] > > Mike the stuff you want is called high modulus silicone sealant .. this stuff is like rubber ...a 6 inch piece of it can be stretched to 18 inches without busting. the hi mod also sets within hours . be careful what you buy ...some have mastic mixed in with the silicone ... seams that Dow corning is the stuff to avoid at all costs and is the dearest and is most likely to have mastic mixed in with it . . plumbers merchants ...builders supplies sell the high mod ... best price on a tube would be £1 all the best.markj >seams that Dow corning is the stuff to avoid at all costs and is the >dearest and is most likely to have mastic mixed in with it . . So all Dow Corning products are shite then? You'd better let all their industrial customers who have used their products for decades know how bad they are. Not that they'll believe you - because I certainly don't. -- > On Wed, 25 Mar 2009 05:46:14 -0700 (PDT), mark > [quoted text clipped - 9 lines] > > -- Did I say :- all Dow corning is shite Have you come here just to argue ..would you rather him go down a long road of mistakes? All i did is give advice ..to help him avoid making the same mistake Ive made a few times Every time I've bought Dow corning silicone, I've ended up with some inferior product that is half mastic half silicone and don't set up ...what ever it says on the tube..........if its says silicone it should be 100 percent silicone ..and should not have to pay £4 plus for inferior crap Seams silicone is like DVD players ..the less you pay the better it is ....thats what Ive found. and don't comment on these news groups if you're not prepared to give out your email address ...a comment is not valid coming from a nobody at nobody dot com. Any more comments by you, to me shall be ignored . all the best.markj In article <0393de32-9452-493a-ba27-b0ae44ad6b6f@y9g2000yqg.googlegroups.com>, mark <aboard_epsilon@yahoo.com> writes >and don't comment on these news groups if you're not prepared to give >out your email address ...a comment is not valid coming from a nobody >at nobody dot com. Mark, Can't agree with this point. I, like many others, have found that posting on usenet using a genuine e-mail address results in a lot of spam. Genuine participants are of course always willing to give their e-mail in a form not harvestable by robots. David  SignatureDavid Littlewood >In article ><0393de32-9452-493a-ba27-b0ae44ad6b6f@y9g2000yqg.googlegroups.com>, mark [quoted text clipped - 12 lines] > >David You may note that I have never hidden my identity or munged my email address when posting in any group or forum. OTOH, I run a very well configured mail server... Mark Rand RTFM > >In article > ><0393de32-9452-493a-ba27-b0ae44ad6b6f@y9g2000yqg.googlegroups.com>, mark [quoted text clipped - 20 lines] > Mark Rand > RTFM I signed up on google groups using my (former) employers email. (I had some work related questions at the time) seems I dont get *any* spam from usenet at all..... Dave > In article > <0393de32-9452-493a-ba27-b0ae44ad6b6f@y9g2000yqg.googlegroups.com>, mark [quoted text clipped - 12 lines] > > David I had to munge my email address, as I was swamped with spam. In fact, I changed service providers as well! Steve R. >> In article >> <0393de32-9452-493a-ba27-b0ae44ad6b6f@y9g2000yqg.googlegroups.com>, mark [quoted text clipped - 15 lines] >I had to munge my email address, as I was swamped with spam. In fact, I >changed service providers as well! Ditto. -- >> On Wed, 25 Mar 2009 05:46:14 -0700 (PDT), mark >> [quoted text clipped - 11 lines] > >Did I say :- all Dow corning is shite Not exactly but it was implied from your posting specifically "Dow corning is the stuff to avoid at all costs" >Every time I've bought Dow corning silicone, I've ended up with some >inferior product that is half mastic half silicone and don't set >up ...what ever it says on the tube..........if its says silicone it >should be 100 percent silicone ..and should not have to pay £4 plus >for inferior crap Your experience differs wildly from thousands of other users, £4 is hardly a premium price, Dow Corning supply products costing ten times that price for just 100ml. >Seams silicone is like DVD players ..the less you pay the better it >is ....thats what Ive found. Your experience differs wildly from thousands of other users. >and don't comment on these news groups if you're not prepared to give >out your email address ...a comment is not valid coming from a nobody >at nobody dot com. > >Any more comments by you, to me shall be ignored . Sad, very sad. The comments were not intended for you, you've quite obviously made up your mind and nothing, not even the truth will change it. -- >>> On Wed, 25 Mar 2009 05:46:14 -0700 (PDT), mark >>> [quoted text clipped - 12 lines] > Not exactly but it was implied from your posting specifically "Dow > corning is the stuff to avoid at all costs" Perhaps for this application (which needs a 100% silicone, without mastic) commonly available dow corning "silicone", which *does* contain mastic, is the least suitable, despite being most expensive? >>>> On Wed, 25 Mar 2009 05:46:14 -0700 (PDT), mark >>>> [quoted text clipped - 16 lines] >mastic) commonly available dow corning "silicone", which *does* contain >mastic, is the least suitable, despite being most expensive? Perhaps, but if your application needs 100% silicone then that is precisely what you specify when you buy - it might be a bargain but I have my doubts that the '£1 tube' in the plumbers merchants is anything like 100% silicone. Rubbishing the products when they have been widely used in industry for decades is IMHO just plain daft, if they were no good, nobody would buy them! -- >> The bath seal type takes ages to set in a mould but is available in >> smaller [quoted text clipped - 6 lines] > required instead of ordering it by the tin over the internet. Can you > suggest brand names suitable for white metal casting for me ? My experience is in using the moulded silicone as the finished object. I use it to make bow bumpers for model racing yachts. There seems to be a wide variation in setting time and Dow Corning was good when I used it. Typically I buy what's available easily and cheaply and Dow's is more expensive. Not that I get through a lot. Don't know how it stands up to molten white metal but for a few bob I guess it's worth a try. Henry address is spam resistant - just remove the bait from the trap! >> The bath seal type takes ages to set in a mould but is available in smaller >> cheaper quantities. [quoted text clipped - 11 lines] > Mike > I have some Dow Corning Silastic 3120 IIRC 2 part silicon rubber suitable for casting the likes of pewter (Britania metal these days) and it seems to keep well, I haven't used it for a couple of years but the last time I did it worked well and was about 4 years old then. IIRC the beneficial additions making it more heat resistant are the addition of iron oxide, rust, which gives it the characteristic brown colour and heat dispersion so helping it to cope with the high temps, that's what I was told. While pewter is beyond it rated temp range it still works well but has a reduced lifetime, not a problem for the low number of castings I do. I got mine from "Industrial silicones and lubricants ltd", I had to by more and I didn't know about Tiranti at the time. IIRC Tiranti sell smaller quantities at higher costs so it's a balance regarding how much you actually need. |
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