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PostPosted: October 22, 2019, 2:13 am 
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Location: No. Nevada
Tripped across a video touting Willow Glass.
Actual glass, but flexible.
.1 and .2 mm thick available.
Probably does not do compound curves but certainly does single plane curves very well.
I've sent an email to Corning with questions.
My hope would be to laminate it to Polycarbonate or Plexiglass.
That might take care of the scratch and chemical damage issues with using Polycarbonate or Plexiglass.
The video I saw is several years old, anyone have experience with this product?

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PostPosted: October 23, 2019, 10:21 pm 
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Heard back from Corning tonight.
Yes what I want to do can be done.
Uh no, I cannot afford to buy a buy a 1000' roll for my own use.
Yes, they do have resellers who can send a smaller piece.
Yes, single plane bends are simple.
So I'm adding this to my experiment list.

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PostPosted: October 24, 2019, 12:37 am 
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Richard, are you saying that cut and bent to size you could use this stuff as legal windshield?

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PostPosted: October 24, 2019, 1:27 am 
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Not sure about "Legal", but I think a true Glass layer over Polycarbonate could be very good for custom applications.
Poly and Plexi alone do poorly for scratch and chemical resistance.
Doubt anyone here has the deep pockets to get such certified but might be an alternative to just plastic.
Fo my own Dio build I may stick an OEM glass on it long enough to be inspected and registered.
Then swap out to the shape I really want with the Willow glass layer over Poly. :!:

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PostPosted: October 24, 2019, 9:55 am 
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This sounds rather intriguing. What are you planning to use for an optically clear bonding layer and how are you planning to apply it? I've thought about doing similar with a plexi outer and poly inner, as that should be better than just straight poly, but as far out of a concern as this is, didn't get very deep into figuring out what to use and how to use it.

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PostPosted: October 24, 2019, 12:31 pm 
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Interesting concept guys.

I know that 3M has optically clear adhesives for just such purposes. A 30 second Google search came up with this:

https://multimedia.3m.com/mws/media/530 ... 4-8215.pdf

There may be more options. This is just one.

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PostPosted: October 24, 2019, 10:16 pm 
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Laminated safety glass has been used in production car windshields since the '20s, so "optically clear adhesives" have been around a long long time. I have confidence you can make this work. Not enough confidence to invest money in the procedure, but enough to follow this topic with interest.

One of the best things about this idea is it'll make for a significantly lighter windshield than an all glass version. One of the worst things is, your DMV is unlikely to approve it, regardless of the fact that it solves the polycarbonate easy-scratch problem. They want Gov't Approved AS-1 Safety Glass.

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PostPosted: October 24, 2019, 10:55 pm 
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I've never been asked about my windshield on any car once it's been registered.
So maybe a Spitfire windshield for registration, then swap to my own design.
At worst a possible Fix-It ticket.

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PostPosted: October 25, 2019, 12:47 am 
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Oh yes, optically clear adhesives have been used in laminated safety glass for many years, but its existence does not ensure the ability to both procure it small quantities and subsequently apply it with no (or at least minimal) imperfections. Maybe it's easy (enough) to get good (enough) results on the first try in a typical home garage...But then again, maybe it's not. That's what I'd really want to know.

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PostPosted: October 25, 2019, 3:13 am 
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Adhesives are not the main issue.
The reply from Corning stated I would have to be careful not to bend the Willow glass after bonding to prevent cracks.
So I'm thinking the poly needs to be fully supported during bonding, then trimmed and framed before fitting to the car.
Still waiting on a resellers name so that I may buy a test piece.

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PostPosted: October 25, 2019, 6:38 pm 
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Interesting idea. I expect the concern of flex once bonded is because any flex will put the glass in tension or compression.

I wonder how much resilience there is in the adhesives? And how much warming in the sun will put tension into the glass covering (plastics tend to expand a lot with temperature, glass not so much).

I hope it works though as it would be a great option for custom light windshields.

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PostPosted: October 25, 2019, 8:29 pm 
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Fully supported sounds like vacuum bagging to me ie no problem


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PostPosted: October 25, 2019, 11:38 pm 
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Or setting it flat on your build table. But the varying size with varying temperature sounds like a potential problem.

Vacuum bagging would make the assembly conform to whatever shape the polycarb is to begin with, and if it's not flat, there will be stresses when you force it flat in your windshield frame (says Jack, sagely, pretending he is speaking from experience, which is not true).

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PostPosted: October 26, 2019, 12:01 am 
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RichardSIA wrote:
I've never been asked about my windshield on any car once it's been registered.
So maybe a Spitfire windshield for registration, then swap to my own design.
At worst a possible Fix-It ticket.


Probably would invalidate your insurance coverage in the event of a large claim.

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PostPosted: October 26, 2019, 11:31 am 
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Just thought I'd add this Video. Long but ends up with a laminated Willow glass demo.



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