Re: [PSUBS-MAILIST] FEA of a Basic Flat Acrylic Viewport

[" Dan. H." <jumachine@comcast.net>]

Frank,

 

I don't have the information here with me and don't remember the trade name of the product I used.  The Sikaflex-295 your considering should be fine.  What I liked about it is it's a good sealant and it also is a filler for the places where there might be some clearance between the face of the lens and the face of the housing.

 

Dan H.

 

 

----- Original Message -----

From: ShellyDalg@aol.com

To: personal_submersibles@psubs.org

Sent: Thursday, February 28, 2008 11:18 AM

Subject: Re: [PSUBS-MAILIST] FEA of a Basic Flat Acrylic Viewport

Hello Dan. What type of urethane did you use to bed your lens in ? I much prefer the urethane seal versus the O ring or gasket approach. My thought is this.... with a 2 inch backing ring and a 3 inch thick lens, I have 5 inches of seal for the water to get through, rather than 2 inch for a gasket, or 1/4 inch for an O ring.

With urethane on the outside, covered by the retainer ring, the seal increases to 7 inches.

I will be ordering the three pieces from Greg soon, and was planning on calling the Sika Flex people for a recommendation. I'd appreciate any thoughts and experience you could provide. Thanks, Frank D.

Also.....Nice work Brent!

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