Moulding rubber

davecooper · 10th January 2011, 06:15 PM

Has anyone used pouring rubber as used for making moulds. I would like to experiment with it for damping but do not know what I should be buying as there are a few to choose from. Two areas where I want to try it are in a plastic plinth and in a turntable platter.

davecooper · 10th January 2011, 08:55 PM

I should have said liquid rubber as this stuff can also be brushed on to an object to make a mould. It would seem like the ideal stuff to use on items such as a Rega sub platter to fill the voids. As long as the platter is exactly level, the rubber should flow evenly over the surface and remain balanced.

SY · 10th January 2011, 09:03 PM

I've made puppets this way- two part silicone is not cheap, but it's the best. Doesn't stick, flows well, cures fully.

theAnonymous1 · 10th January 2011, 09:24 PM

If making a mould of a large disk, wouldn't you need to add some sort of support stucture to the mould to prevent the large surface area from drooping? Unless of course you make the mould large enough that is would support itself, but that seems like a waste of material.

Puppets?

SY · 10th January 2011, 09:37 PM

Quote:

Originally Posted by theAnonymous1

Puppets?

Can't help it, my parents were artists, as is my wife. Thoroughly polluted me.

jlsem · 11:52 PM

For damping purposes you can use Devcon two-part urethane filled with barium titanate powder. Flexane is a little cheaper than silicone casting compounds.

http://www.devcon.com/products/produ...le%20Urethanes

John

SY · 10th January 2011, 11:52 PM

Depends. For filling for damping purposes, yes. For moldmaking, it might be tough to get good release.

qusp · 10:15 AM

urethane is quite good for this purpose I would think, for the object itself that is, for the mold I would still recommend good old RTV (silicone 2 part) for the platter I would not go too far with the shore rating, perhaps 70-80A which will retain some flex, though very hard to the touch, just means its not brittle as some of the higher ratings. I use shore 70-80A hardness for casting my own connector housings and even quite small they are very strong due to having this small amount of flex. only thing is, casting something this size will create quite a bit of heat, so take precautions and read up on the process before you start. you could even go harder, but I wont give any specific advise towards making a platter as I dont have any experience there

qusp · 11th January 2011, 10:16 AM

larger items actually cure/set quicker, but the larger it is, the hotter it gets because of the reaction

10th January 2011, 06:15 PM	#1
davecooper diyAudio Member Join Date: Feb 2006 Location: Ulverston in Cumbria	Moulding rubber Has anyone used pouring rubber as used for making moulds. I would like to experiment with it for damping but do not know what I should be buying as there are a few to choose from. Two areas where I want to try it are in a plastic plinth and in a turntable platter.

10th January 2011, 09:03 PM	#3
SY diyAudio Moderator Join Date: Oct 2002 Location: Chicagoland Blog Entries: 1	I've made puppets this way- two part silicone is not cheap, but it's the best. Doesn't stick, flows well, cures fully. __________________ If there's a sucker born every minute, where do the rest of them come from?

10th January 2011, 09:24 PM	#4
theAnonymous1 diyAudio Member Join Date: Feb 2004 Location: Anonymityville	If making a mould of a large disk, wouldn't you need to add some sort of support stucture to the mould to prevent the large surface area from drooping? Unless of course you make the mould large enough that is would support itself, but that seems like a waste of material. Puppets? __________________ "If you don't like funerals don't kick sand in Ninja's face." - Ninja

10th January 2011, 11:50 PM	#6
jlsem diyAudio Member Join Date: Jun 2003 Location: Dallas,TX	For damping purposes you can use Devcon two-part urethane filled with barium titanate powder. Flexane is a little cheaper than silicone casting compounds. http://www.devcon.com/products/produ...le%20Urethanes John Last edited by jlsem; 10th January 2011 at 11:52 PM.

10th January 2011, 11:52 PM	#7
SY diyAudio Moderator Join Date: Oct 2002 Location: Chicagoland Blog Entries: 1	Depends. For filling for damping purposes, yes. For moldmaking, it might be tough to get good release. __________________ If there's a sucker born every minute, where do the rest of them come from?


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10th January 2011, 08:55 PM	#2
davecooper diyAudio Member Join Date: Feb 2006 Location: Ulverston in Cumbria	I should have said liquid rubber as this stuff can also be brushed on to an object to make a mould. It would seem like the ideal stuff to use on items such as a Rega sub platter to fill the voids. As long as the platter is exactly level, the rubber should flow evenly over the surface and remain balanced.

11th January 2011, 10:10 AM	#8
qusp is choosing a less facetious title... diyAudio Member Join Date: Oct 2009 Location: Brisbane, Australia	urethane is quite good for this purpose I would think, for the object itself that is, for the mold I would still recommend good old RTV (silicone 2 part) for the platter I would not go too far with the shore rating, perhaps 70-80A which will retain some flex, though very hard to the touch, just means its not brittle as some of the higher ratings. I use shore 70-80A hardness for casting my own connector housings and even quite small they are very strong due to having this small amount of flex. only thing is, casting something this size will create quite a bit of heat, so take precautions and read up on the process before you start. you could even go harder, but I wont give any specific advise towards making a platter as I dont have any experience there Last edited by qusp; 11th January 2011 at 10:15 AM.

11th January 2011, 10:16 AM	#9
qusp is choosing a less facetious title... diyAudio Member Join Date: Oct 2009 Location: Brisbane, Australia	larger items actually cure/set quicker, but the larger it is, the hotter it gets because of the reaction

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