Responses lamination yellowing

Responses lamination yellowing

J Bindi

9/27/2001

Original Post:
I've noticed that laminations yellow when exposed to UV. I laminate with Epox-acryl. Is that the reason? Has anyone else experienced this?

Thanks for all the replies!
Julie

Responses:

From my past experiences with laminating..It seems that all resins begin to yellow after being in contact with UV rays..But, I'd still be interested in the responses..

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Try shaking the resin before mixing I think this should work. We had a similar problem here about a year ago.

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We too had the same problems with this resin. Initially our local
distributer told us that we were mixing it wrong! Others here had similar
problems and many have stopped using it. We have started using Composite
resin by SPT Technology which is actually cheaper and ,up until now, seems
to be performing well. I still like the old Otto Bock acrylic for it's
stiffness etc, but is expensive.

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In my experience, the only resin system that is not UV sensitive is straight acrylic. Bock or IPOS resins have always worked well for us, but are more expensive and almost always required a beauty coat to obtain a flawless lamination. This not nearly as important today with the use of endo and liner systems.

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Problem is you are using resin that does not offer UV protection. I have resin that does. Interested? It is my own version of
AME.....actually, it is the original formula.

Call me at (914) 699 2077

Andrew

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one of the reasons we have changed to Otto Bock acrylic many years ago...

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It has been our experience that the only resin that dose not seem to yellow is Otto Bock Acrylic any other resin is subject to UV light. That's why we use acrylic on all finial laminations.

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All resins will yellow in direct sunlight, unless you pump them full of
UV inhibiters.
The problem is the inhibitors are an impurity in the resin and like
pigment will
detract from the strength of the lamination.
The best compromise is to use enough to slow the reaction to the UV with
the use of
a limited amount of inhibiters.
Most all the resin manufactures know this and are already adding them to
the resin.
You can also get pigments that are more UV stable to help the situation.
I am not sure if any of our industry suppliers provide such pigments but
they are
available from resin and some paint companies.

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It's common for a laminate to fade and yellow. It is mostly due to the
fact that the red pigment in the caucasian color is not stable in UV
light. This does not affect laminate strength.

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You are not alone. I have definitely noticed a lot more yellowing of the sockets with individuals who are out in the sun when using Epox-acryl resin.