[GreenKeys] TP180502 Head, Print Hammer

[Ron Kolarik]

Good find Steve and it's widely available. If I had a sample or very
good dimensions on an original I could come up with a mold and 
make a small test run if the group wants to give it a shot.

Ron
K0IDT


----- Original Message ----- 
From: "Steve Schlink" <sschlink at mindspring.com>
To: "GreenKeys" <greenkeys at mailman.qth.net>
Sent: Thursday, April 12, 2012 2:28 PM
Subject: Re: [GreenKeys] TP180502 Head, Print Hammer


>I would second the urethane suggestion, although maybe room temperature 
> curing rather than thermoset injection molding. The mold cost would 
> probably be a show stopper.
> 
> I recently had to replace a windshield on the car, and used a 3M product 
> called Windo-Weld p/n 08609.
> 
> http://tinyurl.com/7asyrzv
> 
> This is the toughest air curing elastomer that I have ever used, easily by 
> an order of magnitude.
> 
> It comes in a caulking tube, so I would think that it would be fairly easy 
> to adapt to a primitive mold. One tube would probably yield about 100 
> hammers pads.
> 
> It is also available for a marine application although I don't have a prod. 
> number for it.
> 
> If I had to guesstimate, I would put the Shore A durometer at about 70, 
> typical for most O-rings.
> 
> As a comparison, it is much harder & tougher than any polysiloxane 
> (Silicone) that I have used.
> 
> But, since we don't even know the hardness of an original, it make take 
> some trial & error.
> 
> Steve
> 
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