<div dir="ltr"><div>Hi Brian,</div><div> </div><div>Hank has already said it but the epdm doesn't seem so good. I went with it because that's what it said in the Stachiw book. I tested my dome to 60 meters (200 feet) and although I couldn't see it, the rubber had obviously extruded quite a lot due to the amount of silicone squeezed out. Also, on my forward main tank, I have "windows" that are mounted on epdm seats. They are not pressure windows, just covers but they still need to seal the main tank. When I tighten the 8 bolts, the epdm extrudes maybe up to 5mm in places and I have to go around and trim it off. And they leaked before I sealed them permanently with sikaflex.</div><div> </div><div>Hank tested the neoprene\cork blend I sent him and it tested out much better. Im changing my dome mount to have that instead.</div><div> </div><div>Perhaps if you used a harder EPDM it might be ok? The one I have is 70 shore.</div><div> </div><div>I think a lot of people just sit the acrylic straight on the seat as well. I would probably just do that now with my dome, but I cannot as the retaining ring seal is designed for the 1mm gasket underneath. I am changing the seat for 1mm neoprene\cork gasket in a few weeks time.</div><div> </div><div>Kind Regards</div><div>James</div><div> </div><div> </div><div> </div><div> </div></div><div class="gmail_extra"><br><div class="gmail_quote">On 31 December 2015 at 02:27, Brian Cox via Personal_Submersibles <span dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="font-family:Arial,sans-serif;font-size:10pt"><div>I think you're the only one who uses cork, Stachiw shows "rubber" and I've seen many subs with rubber products, I'll just have to find a gnarly glue, I think silicone might work. How do you know how to do electroplating? don't you have to dip the whole thing into a solution and then run a current through it?</div><div> </div><div>Brian <br><br>--- <a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a> wrote:<br><br>From: hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><span><br>To: Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>Subject: Re: [PSUBS-MAILIST] electro plating<br></span>Date: Wed, 30 Dec 2015 22:43:28 +0000 (UTC)<br><br></div><div style="color:rgb(0,0,0);font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:12px;background-color:rgb(255,255,255)"><span><div><span>Brian,</span></div><div><span>I tested EPDM in my port test chamber with contact cement and it extruded, rubber extrudes man. Gamma has cork</span></div></span><div><span>Hank</span></div> <div><br><br></div><div style="display:block"> <div style="font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:12px"> <div style="font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:16px"><span> <div dir="ltr"><font face="Arial" size="2"> On Wednesday, December 30, 2015 3:29 PM, Brian Cox via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br></font></div> <br><br> </span><div><div><div><div style="font-family:Arial,sans-serif;font-size:10pt"><span><div>Oh, pg 237 : To minimize lateral extrusion under compression they should be securely bonded with contact cement to the bearing support seat in the flange.</div><div> </div><div>Brian Cox<br><br>--- <a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a> wrote:<br><br>From: Brian Cox via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>To: "Personal Submersibles General Discussion" <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>Subject: Re: [PSUBS-MAILIST] electro plating<br>Date: Wed, 30 Dec 2015 14:23:28 -0800<br><br></div></span><div><div style="font-family:Arial,sans-serif;font-size:10pt"><span><div>Hank,</div><div> I don't remember anything in the Stachiw book about an extruding problem, I'll have to check again. They designate various gasket material and thickness, and they call for neoprene, and some others, I'm using EPDM. </div><div> </div><div>Brian <br><br>--- <a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a> wrote:<br><br>From: hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>To: Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>Subject: Re: [PSUBS-MAILIST] electro plating<br>Date: Wed, 30 Dec 2015 21:51:36 +0000 (UTC)<br><br></div></span><div style="color:rgb(0,0,0);font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:12px;background-color:rgb(255,255,255)"><span><div><span>Hi Brian,</span></div><div><span>Yes I could overlay weld ss, but that is a ton of work compared to electroplating. </span></div><div><span>Yes your Gasket will extrude if you use rubber. I just did some compression testing for a Psub member with cork he supplied. The cork compresses .03 inch and stays compressed and does not extrude. I tested the cork material to 1,555 psi. </span></div></span><span class="HOEnZb"><font color="#888888"><div><span>Hank</span></div> <div><br><br></div></font></span><div style="display:block"> <div style="font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:12px"> <div style="font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:16px"><span> <div dir="ltr"><font face="Arial" size="2"> On Wednesday, December 30, 2015 11:52 AM, Brian Cox via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br></font></div> <br><br> </span><div><div><div><div style="font-family:Arial,sans-serif;font-size:10pt"><span><div>You could lay some stainless weld over the entire area and then machine it flat.</div><div> </div><div>Brian Cox<br><br>--- <a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a> wrote:<br><br>From: hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>To: Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>Subject: [PSUBS-MAILIST] electro plating<br>Date: Wed, 30 Dec 2015 13:45:03 +0000 (UTC)<br><br></div></span><span><div><div style="color:rgb(0,0,0);font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:12px;background-color:rgb(255,255,255)"><div>Hi All,</div><div>Has anyone looked at electro plating a hatch and land mating surface. That is my plan, first copper, then nickel. I can do it myself at home. </div><div>Hank</div></div></div>_______________________________________________
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