How can I make a rubber stopper at home? tia sal

[Guest]

Greetings all,

I would like to make my own rubber stoppers I have created a mold using plaster of paris,
I have tried epoxy and fiberglass resin but these end up being to hard does anyone know
what I can use to make softer rubber stoppers.

TIA SAL

 

[Mark Fergerson]

Greetings all,

I would like to make my own rubber stoppers I have created a mold using plaster of paris,
I have tried epoxy and fiberglass resin but these end up being to hard does anyone know
what I can use to make softer rubber stoppers.

You could try RTV (Room Temperature Vulcanizing) silicone rubber,
but it'll get expensive pretty quick, and you'd probably have to
build them up in layers due to the shrinkage issue.

Why don't you just buy them? Odd-sized glassware?


Mark L. Fergerson

 

[felix]

Hi
If you want to duplicate an odd sized version of the standard rubber
stopper, I will guess that you cannot do it.

The rubber they use in these is resistant to many chemicals including
gasoline and acids, it ignores reasonably high temperatures, and does not
deteriorate, crack or harden with age. And best of all, the rubber
formulation they use has the right compression to make a reliable seal
without leaking,even when re-used many times.

Any commonly available material, including RTV , will not meet the above
criteria.


Of course, they probably aren't really rubber, but some concoction descended
from a barrel of Arab oil....

Felix

 

[Clint Sharp]

You could try and find a Dow Corning office, they sent me some 'samples'
(half a litre of each) of two, two part pourable 'rubber' compounds for
potting some temperature stabilised optical sensors I designed. The
stuff I got was probably too soft when cured for what you need but they
do have a wide range of compounds, speak to a tech rep and they'll be
able make suggestions if you explain what you need.

 

[Noah Little]

Google for "cast urethane" without the quotes

Probably better with the quotes; that way, Google will look for that
phrase. Otherwise, it will return all pages that contain the words
"urethane" and "cast" regardless of proximity (although their search
algorithn does appear to bring pages with the words in proximity to the
front).

 

[JANA]

I think you are going to a lot of trouble for something that can be bought
for a few dollars!

--

JANA
_____


Greetings all,

I would like to make my own rubber stoppers I have created a mold using
plaster of paris,
I have tried epoxy and fiberglass resin but these end up being to hard does
anyone know
what I can use to make softer rubber stoppers.

TIA SAL

 

[Al]

I think you are going to a lot of trouble for something that can be bought
for a few dollars!

Lookup latex rubber molding compound on Google. Lottsa hits.

Al