LR White™ Resin System
When things do go wrong.......
LR White Resin is quite easy to use, and along with other "one step" resin systems such as
Unicryl™ or
Monostep™ Resin Systems.
In general, we have never had a batch that essentially was a bad batch and failed in the hands
universally of end users.
But when things really don't work, there are several things worth checking since one of them
almost always turns out to be the reason:
1] The true temperature in the polymerizing oven. Some thermostats are very approximate and
below 55°C you are unlikely to get a solid polymer (though the resin may 'thicken').
2] Failure to exclude contact with oxygen (air) when thermally polymerizing. Thin flat
embedments or silicone rubber molds are the usual suspects here if used uncovered. But
there are ways to "cover" them with another mold, whereby you over fill the cavities so that
when the second mold is put on top, capillary action "seals" out the oxygen and the
polymerization proceeds uninterrupted. Note that SPI Supplies has engineered
UV transparent silicone embedding molds
that are specifically offered for this kind of situation. Another option is to use the well-know
BEEM® capsules using a
UV transparent BEEM Capsule Holder.
Sometimes the tip-off that something has gone wrong is the physical appearance of the block since
instead of being clear, it has turned literally white.
A slow, low temperature polymerization (actually any temperature below 55°C) and/or water contamination of the
resin (inadequate dehydration) can both lead to the "white" color effect. Also when this happens the blocks tend
to be soft or "rubbery" or they become crunchy (crystalline appearing, but it is of course not really crystalline)
and the blocks tend to crumble. The rubbery/crunchy scenario is more usual when there is excess water left in the
tissue which diffuses out into the resin but it particularly likely, indeed almost guaranteed, if the resin has
excess water and polymerized at too low of a temperature.
If you have the need for low temperature polymerization, you should be considering the use of
L R Gold instead.
To Ask a Question or Make a Comment
To Place an Order or Request a Quote
Return to:
Monday March 22, 2010
© Copyright 2003 - 2010. By Structure Probe, Inc.
Contacting SPI Supplies and Structure Probe, Inc.
All rights reserved.
All trademarks and trade names are the property of their respective owners.
Privacy Policy
Worldwide Distributors, Representatives, and Agents
