[PSUBS-MAILIST] port grease

Thu Jul 21 10:29:18 EDT 2016

Alec,I was using a white non petroleum based grease, it was not so good.  I will have to order some vacuum grease.  Hank 

    On Thursday, July 21, 2016 8:24 AM, Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Darn, I was hoping to see an answer to that one because I'm having the exact same experience installing conical viewports, and it's the first time I'm doing it. I have an even more basic question. What type of grease are you using Hank? I'm using Dow Corning high vacuum grease, but it's running low and I'm probably not going to be able to finish the job so wondering if there are more readily available alternatives.
http://www.dowcorning.com/applications/search/products/details.aspx?prod=01018817&type=PROD

Thanks,

Alec
On Wed, Jul 20, 2016 at 12:27 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Hi Sean,I have a couple questions.  Can I assume that grease trapped in super small scratches in the port seat will carry the load of the acrylic.  These are swirls left after sanding and polishing the seat.  How much grease do I actually put on the seat?  When I grease the seat with a very thin layer, air gets trapped in small bubbles even when I rotate the port.  I have seen these marks in the grease in pictures of other subs with conical ports.  Are those air bubbles a problem or will they squeeze out under pressure?Thanks' SeanHank
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