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Re: Modifying rubber compounds - window seals

To: "ptegler@cablespeed" <ptegler@cablespeed.com>, <triumphs@autox.team.net>,
Subject: Re: Modifying rubber compounds - window seals
From: "William Davies" <bill@rarebits4classics.co.uk>
Date: Mon, 20 Jan 2003 16:34:43 -0000
----- Original Message ----- 
From: ptegler@cablespeed <ptegler@cablespeed.com>

> The problem is the seal is not 'shaped' to the window.
> It is simply one long extrusion of rubber. The outer most
> lip that is most visible is thin and splits rather quickly.
> 
> (this is the  seal on the glass of a Triumph GT6 rear hatch)

Continuous extrusions should be engineered to cope with a specific minimum bend 
radius. As such, the rubber used for this would not be an identical compound to 
that used in a fully formed seal with moulded corners. My own recommendation 
where a seal is forming a tight radius, is to cut the seal to a generous length 
so that the inside of the bend is compressed, reducing the tension of the 
outside of the bend. Also use plenty of your preferred sealant at the outside 
of the bend - this will help adhere the outside edge to the frame, again 
reducing the possibility of splitting.
    Cheers,
        Bill.

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