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

plaster of paris,

anyone know

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

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

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.

of paris,

anyone know

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).

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

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JANA _____

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

Lookup latex rubber molding compound on Google. Lottsa hits.

Al