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Thread: Foam Rubber Padding -- Bad Idea?

  1. #1
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    Default Foam Rubber Padding -- Bad Idea?



    Hi Gang,

    For the last 18 months, my C11 has been stored in a giant case surrounded by an old foam mattress topper (cut up to fit around the scope). I'm assuming it is a polyurethane foam and not a "memory" foam but I'm not sure. My C11 probably gets used once every 3 or 4 months (this is what happens when you own too many scopes), so it spends the vast majority of the time in this case in the garage where the average temp is between 80-85°F. When I started using this foam the scope had just come back from a Celestron "tune-up" and the corrector plate was pristine. Last night while using the scope and checking for dew I noticed that the corrector plate is no longer pristine, it has some sort of film on both sides! I'm pretty certain it is cleanable but I don't want to put it back into its case with this foam if the foam is causing the problem. Interestingly enough, the primary mirror is still pristine.

    Question-- in the close confines of its storage case, can foam padding leave a residue on glass due to out-gassing (or whatever) even though the glass is covered and the foam never comes into direct contact with the glass?

    Any thoughts or hints would be greatly appreciated.

    Cheers,
    JT

    This is the case in question.

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    Default Re: Foam Rubber Padding -- Bad Idea?

    JT,

    This is not the same type of foam as yours but it does list a volatile organic emission rate

    https://reglinrubber.com.au/product/...heet-superior/

    Here is a link to the USA EPA emission standards for foam rubber production. I think it refers to the factories not the final product.

    I've never been a fan of storage cases, especially sealed ones. I live in a very dry climate, so sealing a scope in a box after an observing session, seals any moisture in with the OTA. You live in HI so being more humid, an OTA sealed in a case with dessicant may be a better option.

    In short it could be emission from the foam or fungal growth.

    Joe
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    Default Re: Foam Rubber Padding -- Bad Idea?

    JT,
    Sorry forgot to include the URL for the standards

    https://www.epa.gov/stationary-sourc...er-plastic-and

    Jeo
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    Default Re: Foam Rubber Padding -- Bad Idea?

    JT,

    My experience with foam is not positive (foam rubber exercise pad and a mouse pad).

    The round IKEA mouse pad fits perfectly In my SCT as a cover for my corrector plate. Once a few months passed by with the SCT stored in a case without me using it the rubber deteriorated over time into very fine particle's. When I went to use my scope after a few months storage I found the corrector plate covered with the rubber particles. Fortunately no particles got inside the OTA. They were not difficult to remove (handbulb air blower and a camel hair artist brush). However, had I not sealed the OTA the story may have been different. The exercise pad had a similar end. This story unfolded over a couple of years.

    Joe
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