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