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GR-653LP-P Hardcoat Primerless for Polycarbonate
Chemistry:
GR-653LP-P 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.
Cure Temperatures:
85°C - 5 hours
100°C - 2-3 hours
125°C - 45 minutes
135°C - 20-30 minutes

Adhesion: 100 percent using crosshatch scotch tape adhesion after one hour boiling water.
Abrasion Resistance:
Excellent to "0000" steel wool (mild pressure).
Packaging:
Five gallon, UN1A1 polyethylene drums with Reike spouts.

Storage:
GR-653LP-P is sensitive to conditions under which it is stored. When stored at 40&#deg;F and below, it will be stable for more than six months.

Substrates:
GR-653LP-P presently used to coat polycarbonate without the use of a primer.

Typical Application:
Lenses - safety, opthalmic, sunglass
Visors - safety
Also - gauge faces, appliance and computer parts

Hardcoat
Application:
The GR-653LP-P is applied for 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. Generally, dip coating is done at 30 to 35 percent solids at one to eight inches per minute withdrawal rate, spin coating 25 to 30 percent solids and spray coating at 18 to 23 percent solids. Final film thickness will 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 or 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-653LP-P returns a constant 50 to 55&#deg;F temperature. The GR-653LP-P is then pumped through the filters and into the tank again, generally through a manifold o the bottom of the tank which provides precise circulation eliminating dead spots.

Chemical Resistance:
Completely cured GR-653LP-P is resistant to most solvents.

The GR-653LP-P will, however, be attacked by strong bases and solutions containing HF.

Custom Coaters:
Please call for a list of custom coaters who can apply GR-653LP-P coating for prototyping, preproduction or small and large production runs. For smaller volumes, using a custom coater is much 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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