Re: Bubble and anomaly free wax application?

From: Uncle Al (UncleAl0_at_hate.spam.net)
Date: 03/11/05 

Date: Fri, 11 Mar 2005 11:09:24 -0800

jlafferty wrote:
>
> Hi,
>
> I've been experimenting with applying a very thin layer -- about the
> thickness of a single piece of Scotch brand tape -- of
> microcrystalline wax between two pieces of glass. I'm so far having
> no luck.
>
> I've tried the following methods:
>
> Spacing the glass apart by placing small strips of tape between them,
> and then wrapping the two with tape, I've submerged the entire setup
> in melted wax. Problem: air gets trapped in the space between the
> glass and is near impossible to remove (without resorting to a vacuum
> chamber, which I don't have).
>
> Pouring a small bit of melted wax on one of the pieces of glass which
> has tape at its edges acting as spacers, then placing the other piece
> of glass ontop and applying even pressure. Problem: though both pieces
> of glass have been pre-heated and cleaned repeatedly, subtle anomalies
> and stratifications in the wax surface persist -- these are a mystery
> to me and I'm at a loss as to how to better apply the wax.
>
> Do any of you have advice as to what techniques I should use?
> Essentially, I need to sandwich a very thin layer of wax between two
> round (49mm dia) pieces of glass to act as a focusing screen for an
> optical device, and so it must be free of bubbles and superficial
> anomalies.

Try amorphous polyethylene food wrap or a transparent Kraton rubber.
If you wnat it cloudy, a non-transparent (filled) Kraton rubber or a
filled silicone. 

-- 
Uncle Al
http://www.mazepath.com/uncleal/
 (Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz.pdf

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