SUNGARD ® POLYCARBONATE
SunGard weatherable sheet combines the impact strength of polycarbonate with outstanding ultraviolet stability. The extreme toughness of SunGard sheet makes it the ideal choice for various exterior sign applications.
FABRICATION Unlike some competitive polycarbonate sheet products, SunGard sheet is all polycarbonate so that delamination, mold sticking and weathering away of post-applied coatings will not occur. SunGard sheet can be drilled, routed, sheared and painted using the same fabrication and machining techniques as for general purpose polycarbonate. Most conventional mechanical fixing methods such as screws and rivets can be used; adhesive and solvent bonding are also possible. For proper mechanical fastening, always over-drill the hole by 1/16" to allow for expansion. Use an approved silicone sealant in the hole with the fastener to inhibit stress cracking at the hole.
CEMENTING Bonding SunGard sheet to itself and to other plastics can be accomplished. Excellent results can be obtained with urethane adhesives, including Hartel #17017 and Weld-On #55. Silicones are also recommended. Solvent cementing may also be used. For more information, contact your sign distributor. PRE-DRYING The most critical step in the thermoforming process is proper drying of the sheet. The most efficient temperature is 250°F. Drying time is dependent upon oven configuration, air circulation, sheet thickness, etc. For optimum results, remove protective film and space sheets one inch apart in an air-circulating oven. See chart for suggested starting points. NOTE: Always remove protective film when drying sheet at over 200°F.
CLEANING To clean, wash with mild, non-abrasive soap or
detergent and rinse with clean water and a dry, soft cloth. To prevent water spots, dry thoroughly with chamois or clean cloth or sponge. Avoid cleaning in direct sunlight to prevent streaking. Do not use abrasive cleaners. The following cleaning agents are compatible with SunGard products when used according to the manufacturers’ recommendations: • Formula 409® Cleaner • Joy® Liquid
THICKNESS IN INCHES
DRYING TIME
.093
4 hours
.118/.125
5 hours
.150
8 hours
.177/.187
12 hours
.236/.250
24 hours
• Palmolive® Liquid • Windex® Cleaner
PAINTING SunGard sheet can be easily painted and silkscreened using standard materials and techniques. Follow the manufacturer’s guidelines for proper painting and paint removal procedures. Always remove solvents from plastic sheet as quickly as possible to prevent solvent attack. THERMOFORMING SunGard sheet can be vacuum-formed on virtually all thermoforming equipment, from high volume multi- station rotary machines to single station or shuttle presses. Pressure forming techniques have also been highly successful. Excellent forming detail can usually be obtained at sheet temperatures of 350°-425°F. All normal tooling materials such as aluminum, epoxy and various hardwoods can be used.
The UV-resistant surface treatment on one side of the sheet significantly improves long-term weatherability. Periodic cleaning using proper procedures and compatible cleaners is recommended to prolong the service life. CUTTING SunGard sheet can be cut with standard high-speed metal working tools, but carbide-tipped blades are recommended for longer life. Circular saws with triple chip or beveled tooth type blades with about two teeth per inch are recommended, with blade speeds in the 6,000 to 8,000 rpm range. Band saws having 10 to 18 teeth per inch and blade speeds of 2,500 to 3,000 feet per minute should be adequate for smooth, clean cuts.
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