SOHC.co.uk Forums > CB350/400

Making rubber

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K2-K6:
Interesting work Dave, and very useful for some of these component.

The silicone sealant one you tried .... we did mould some of this successfully back in the 70s for bespoke support on such things as brake lines tbat were non std fit. Broadly speaking "cotton reel" shape, plus some rear light mount etc.

We added acetic acid as catalyst/hardener and getting  it to set. Either nylon or ptfe turned on lathe to form mould, release successful.

Some are on a friend's Honda still. Think they're OK but can check.

Maybe of use in this project.

exvalvesetdabbler:
Mold for the rubber ring.  Machine a groove in a bit of scrap polypropylene sheet.

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exvalvesetdabbler:
Mold components for the rubber bushes. In the top of the white piece there is a hole to allow excess resin to escape when it is tightened down.

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exvalvesetdabbler:
Clock assembled to the bowl.

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I am having a look to see what can be done in silicone but hardness options look limited. UV stability is supposed to be excellent though.

The long term stability is still a bit of an unknown with PU, compression set and UV stability,  probably no better than nitrile rubber so I will assemble using an old clock and leave it in the glasshouse over summer and see what happens.

There are some suppliers offering a UV additive but not in the small quantity I would need.


Regards Dave.

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