Re: Exactomer

From: himmer@max1.riken.go.jp
Date: Wed Jan 31 1996 - 12:45:05 EET


Steve Deak wrote,

(GOOD ATTRIBUTES)
Better recoating prameters (faster)
Reduced dewetting, even at 0.005 slice.
More tolerant to trapped volumes
NOT HYDROSCOPIC!!!!!
QuickCast build style drains GREAT!!
Higher Dp with same Ec.(Faster draw speed)
I'M NOT ALLERGIC TO EXACTOMER, YEE HAW!!!!!!

Downside of EXactomer 5201AR:

(NOT SO GOOD STUFF)
Increased liklihood of curl (process and post process induced)
Often tacky surfaces if not properly post processed
Lower tensile strength (but about half way between acrylates and epoxies)
Fruity smell ( its OK, if you're into fruity)
Needs thermal post-curing in addition to UV post-curing
Lower green strength

I think AlliedSignal is revamping the formula to fix some of the less desired
features. However, 5201AR is the same stuff EOS sends out with their
machines in Europe as their machines are Argon-Ion Laser.

-------------------------------------------------------

Do you know what is behind this fruity smell? I guess not.
I am also not allergic to Exactomer, but we use a respiratory
protection mask for post-processing. We have heard, there is
a higher risk of sensitivity (compared to SOMOS 3100).
Also you can add filters which protect from TPM, Aceton, etc.

Best regards Thomas

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_/ _/
_/ Thomas Himmer _/
_/ Institute of Physical and Chemical Research - RIKEN _/
_/ Instrumentation Center, _/
_/ 2-1 Hirosawa, Wako-shi, PHONE: +81-48-462-1111 (Ext.5847) _/
_/ Saitama, 351-01, FAX: +81-48-462-4621 _/
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