Appendix B - Care Of Lens - Symmetricom ND-CLK User Manual

APPENDIX B - CARE OF LENS

This product contains a polycarbonate lens. Adherence to regular and proper cleaning
procedures is recommended to preserve appearance. Scratched or otherwise damaged
lenses caused by misuse, mishandling, improper storage, or improper cleaning is not
covered under the limited warranty.
Washing to Minimize Scratching
Wash polycarbonate sheet with a mild soap or detergent (such as 409 cleaner) and
lukewarm water, using a clean sponge or a soft lint free cloth. DO NOT USE PAPER
TOWELS OR PAPER PRODUCTS TO CLEAN OR DRY THE LENS. Rinse well with
clean water. Dry thoroughly with a chamois or moist cellulose sponge to prevent water
spots. Do not scrub or use brushes or abrasives on these products; the UV coating is not
mar resistant. Also do not use butyl cellosolve in direct sunlight.
Fresh paint splashes, grease and smeared glazing compounds can be removed easily
before drying by rubbing lightly with a good grade of naphtha or isopropyl alcohol.
Follow the alcohol rub with a mild detergent wash with warm water and end with a
thorough rinsing with clean water using a clean damp lint free cloth.
Minimize Hairline Scratches
Always store the clock face-up in the protective plastic shipping bag until ready for
installation and during transporting to the installation site. Do not place the clock face
(lens surface) down on any surface as this may scratch or mar the lens.
Scratches and minor abrasions can be minimized by using a mild automobile polish.
Three such products that tend to polish and fill scratches are Johnson Paste Wax, Novus
Plastic Polish #1 and #2, Novus, Inc., Minneapolis, MN and Mirror Glaze plastic polish
(MG M10) Mirror Bright Polish Co., Pasadena, CA. It is suggested that a test be made on
a very small section of the polycarbonate lens with the product selected and that the
polish manufacturer' s instructions be followed.
"Don'ts" - Very Important
• DON' T store the clock without the protective plastic shipment bag.
• DON' T store or place the clock face down on any surface, as this may scratch the lens.
• DON' T use abrasive or highly alkaline cleaners on the polycarbonate.
• DON' T use paper towels, paper products, rayon, or polyester cloths to clean or dry the
lens. These items are abrasive and can scratch the lens.
• DON' T scrape the polycarbonate lens with squeegees, razor blades or other sharp
instruments.
• DON' T ever use benzene, gasoline, acetone, methyl ethyl ketone (MEK), muriatic acid,
or carbon tetrachloride on the polycarbonate lens.
• DON' T clean polycarbonate lenses in hot sun or on very hot days.
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ND-CLK User Manual- Rev 1.0.1 - Sep-08 Symmetricom , Inc