Re: [PSUBS-MAILIST] glueing acrylic

[Chris Nugent <dirkpitt77@yahoo.com>]

        "Acrylic goes milky colored before it fails,"...

 

      That's interesting.  I didn't know that.  How close is the "milkiness factor" in relation to the catastrophic failure point?  Seconds?  Minutes?  Hours?  Pressure cycles?

 

                                                                                             Chris

Ian Roxborough <irox@ix.netcom.com> wrote:

Acrylic goes milky colored before it fails, I don't believe Lexan has
this property and would fail without any warning. Other than that, the
main reason for using Acrylic is that it is highly tests and the properties
of Acrylic under pressure are well understood.

As for temperature, Acrylic's strength is effected by temperature in a big
way. Can't find Stachiw charts for it right now, but if I remember correctly,
even a few degrees hotter in temperature means de-rating the window or using
thicker Acrylic.

Ian.


On Fri, 15 Oct 2004 09:57:39 -0600
Coalbunny wrote:

> Which is better under pressure, Lexan or acrylic? And how expensive
> does it get when it's 4" thick (by the square foot)?
> Carl
>
>
> Brian Cox wrote:
> > You can get acrylic as thick as 4" so that way you would glue less pieces.
> >
> > Brian "cement" Cox
> >
> > ----- Original Message -----
> > From: Emile
> > To: personal_submersibles@psubs.org
> >
> > Sent: Friday, October 15, 2004 8:20 AM
> > Subject: Re: [PSUBS-MAILIST] glueing acrylic
> >
> > Thank you for the useful information,
> >
> > I was studying the possibility of constucting a dome from ring of 50
> > mm acrylic plate and then machine it (This was discussed before).
> > Just add 25 % wall thickness for glue uncertainty.
> > Why not thust glue? All modern airliners are glued together.
> > I am also working on a tool for blowing a dome, wich has a better
> > material efficiency.
> >
> > Grs, Emile
> >
> >
> >
> > ----- Original Message -----
> > From: No Periscope
> > To: personal_submersibles@psubs.org
> >
> > Sent: Friday, October 15, 2004 4:42 PM
> > Subject: RE: [PSUBS-MAILIST] glueing acrylic
> >
> > I worked for the university of Colorado for a few years and we
> > used lots of Acrylic for building test models of buildings and
> > Dams and just about any thing that needed to be built. We used
> > a glue called PS 30 and it was very strong. It's a two part
> > glue and if the two components where not in just the right
> > amount it would craze. But I never saw any of the joints
> > separate. However,,,,I would never ever consider using anything
> > but a full piece for a view port. DJB
> >
> > Pierre Poulin wrote:
> >
> > Hi emile,
> >
> > My friend work at the university here and he glue acrylic
> > all the time. I
> > asked him and here is the answer...
> >
> > You need: a tank about 0.5" deep and Dichloromethane (french
> > word sorry).
> >
> > How to do: let's say you have a viewport of 8" diameter. you
> > need about 1/8"
> > of Dichloromethane on the bottom of the tank, then you drop
> > the viewport
> > into the tank so all the surface you want to glue is dipping
> > in the dich...
> > wait for about 15 secondes, pull up the viewport about press
> > it to the other
> > surface.
> >
> > Results: My friend says that you may have some small bubbles
> > trapped between
> > the 2 parts. As for strenght, he says that it is as strong
> > as a full plate
> > of acrylic. he does boxes shape and when they "destroye"
> > them, the acrylic
> > almost always break right next to the join. Not the join itself.
> >
> > Hope it helps!
> >
> > P! ierre Poulin
> > "building a dry-ambient sub"
> >
> >
> > >From: "Emile" <2stroke@hetnet.nl>
> > >Reply-To: personal_submersibles@psubs.org
> > >To:
> > >Subject: [PSUBS-MAILIST] glueing acrylic
> > >Date: Fri, 8 Oct 2004 15:12:20 +0200
> > >
> > >Hello all,
> > >
> > >Can anybody help me to some accurate data about glueing
> > acrylic to acrylic?
> > >the following points:
> > >
> > >-how stong. absolute and relative to the acrylic
> > >-methods/ materials
> > >-optical quality
> > >
> > >thanks in advance.
> > >
> > >Emile D.L. van Essen
> > >www.AiResearch.nl
> >
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