Glass Resins for Semipermanent Mold Releases
The Techneglas, Inc. Glass Resins are a family of
methylpolysiloxane polymers, which have
a long history of being
used in semipermanent mold releases. The
Glass Resins that are most commonly used in semipermanent mold
releases are:
GR-650 Flake:a
hard resin flake that is readily soluble in a variety of organic
solvents.
GR-651 Liquid:a 35% solids solution of resin in ethanol-butanol
that also contains a
catalyst of Tetramethylammoniumhydroxide
blocked with Formic acid
GR-655 Liquid:a 25% solids solution of resin in ethanol
These three materials are manufactured to produce a variety of
molecular weight for the
customer. The
GR-650
Flake has the highest M.W., followed by the
GR-655
Liquid and then the GR-651
Liquid. Glass Resins cure by condensation, so degree of cure
depends on time
and temperature.
Formulation
The GR-650 Flake is the most versatile product as it is a solid resin
and can be cut in a
variety of polar solvents, depending on the
flash point desired. Solvents range from ethano
to DPMA. After
the flake is dissolved in polar solvent it can be reduced with
some non-polar
solvent such as an Isopar. The tolerance for a
non-polar reduction is worked out on a case
by case basis based on
the solvents and resin solids used.
The semipermanent mold releases based on Glass Resins are
generally sold at 1 to 3% resin
solids and may incorporate a small
percentage of a high viscosity silicone oil for "fast break".
The
GR-650 Flake can be made available in solution in a variety of
solvents.
All Glass Resins are available with a Certificate of Analysis
showing test results versus those
specified by the customer.
The
GR-650
Flake is sold in 25 pound bags. The
GR-651
Liquid are sold in 5 gallon pails and 55 gallon drums.
If you don't find what you're looking for,
Contact Us.
We may have a suitable product that's not listed, or we may be
able to develop a material to fit your specific needs.
Tel : (02)2217-3442 / Fax : (02)2704-4070
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