Chemistry:
GR-653L
is a methylpolysiloxane
polymer solution.
Solvents:
Methanol-Butanol
Solids:
30
percent
Appearance:
Water
white solution
Cure:
Thermal -- Per one of the schedules below in a forced air oven. |
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Cure Temperatures:
70°C
- 3-4 hours /
80°C - 60-90 minutes
/
125°C - 15 minutes
/
135°C - 10 minutes
Packaging:
Five-gallon, UN1A1, polyethylene drums with
Reike spouts
Storage:
GR-653L
is sensitive to conditions under which it is stored. When stored
at 40°F and below, it will be stable for more than six months.
Substrates:
GR-653L
is presently used to coat polycarbonate
polymethylmethacrylate CR-39(r),
PETG, PET and polysulphone.
Abrasian Resistance:
Excellent to 0000 steel wool (mild pressure)
.
Typical Applications:
Lenses - safety, ophthalmic, sunglass /
Visors - safety, antiballistic /
Aero - cockpit and cabin windows, canopies
/
Windows - bulletproof, skylights
/
Also
- gauge faces, appliance and computer parts
Primer:
Polycarbonate: Techneglas
CT-510, G.E. SHP-200
Arcrylic:
Techneglas CT-510 or "primerless"
GR-653L
Allow the primer to dry before applying the
hardcoat. This will be 10 to 30 minutes, depending on the
temperature, air flow and packing density.
Hardcoat Application:
The
GR-653L is applied by dip, flow, spin or spray coating. The
percent solids, viscosity and solvents will be varied according to
the geometry of the part's surface, area, length of run, film
thickness desired, etc. inches perminute
withdrawal rate, spin coating 25 to 30 percent solids vary between
four and eight microns. Contact the Glass Resin Technical Manager
at (419) 873-2091 for specific recommendations.
Ovens:
Forced air.
Relative Humidity:
50
percent or less.
Filtration:
The
material should be continuously cycled through filters, if
possible, or if not, filtered immediately before application. One
to five micron cotton or P.E. wrapped cartridge filters are
commonly used. Filter housings are 316 or 304 stainless steel or
polypropylene construction.
Materials of Construction:
304
or 316 stainless steel for pumps, filters and tanks with
polyethylene or polypropylene for tanks and lines.
General Notes:
A
typical dip coat system consists of a solution tank,
recirculating pump, reservoir,
filter, chiller and hydraulic table with variable speeds for
changing dip rates. The tank, mounted on the hydraulic table,
overflows on all four sides so there is no drying of the
hardcoat in the tank. The
GR-653L
is then pumped back through the filters and into the tank again,
generally through a manifold on the bottom of the tank which
provides precise circulation eliminating dead spots.
The
GR-653L
returns by gravity back to the reservoir where the chiller
maintains a constant 50 to 55°F temperature. The
GR-653L
is them pumped through the filters and into the tank again;
generally through a manifold on the bottom of the tank which
provides precise circulation, eliminating dead spots.
Chemical Resistance:
Completely cured
GR-653L
is resistant to most solvents.
The GR-653L films will, however, be attacked by strong bases and
solutions containing HF.
Adhesion:
GR-653L Hardcoat over CT-510 Primer
Boiling Water Resistance (Hours)(1)
Polycarbonate PMMA CR-39
4% Primer
3+
4+
4+
8% Primer
8+
4+
4+
Primerless 653LP-P
1+
--
--
(1) Test is crosshatch scotch tape
adhension
Primerless:
The
primerless formulae are available for both PMMA and
polycarbonate. Handling and storage are the same as for the
regular GR-653L
hardcoat with the exception of the bake cycle on the
primerless GR-653L for
polycarbonate. This is as follows:
125°C - 45 minutes
135°C - 20-30 minutes
Primerless type and plastic
substrate must be specified at time of order.
Custom Coaters:
Please call for a list of customs coaters who can apply
GR-653L
coatings for prototyping, preproduction or small and large
production runs. For smaller volumes, using a custom coater can
be more cost effective than setting up a coating operation.
Machine Suppliers:
A list of suppliers who can supply either individual items or a
turnkey operation is available.
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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