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ONE-PART POLYURETHANE TOPCOAT

CHARACTERISTICS    USES    AIR QUALITY DATA    PHYSICAL DATA    PERFORMANCE DATA    SPECIFICATIONS    APPLICATION

PRODUCT DESCRIPTION
Stewart Aircraft Finishing Systems ONE-PART POLYURETHANE TOPCOAT is a waterborne polyurethane. When the customer receives Stewart Systems ONE-PART POLYURETHANE, it is already formed in the container, where as in the solvent base type, the polyurethane is formed on the substrate. Therefore, once the paint is applied on the substrate, the film properties of Stewart Systems ONE-PART POLYURETHANE rival that of other two component catalyzed systems. Stewart Systems ONE-PART POLYURETHANE offers outstanding coverage, excellent durability, and ease of application as well as being a low VOC and EPA compliant coating.

ENVIRONMENTAL ADVANTAGES
Stewart Systems ONE-PART POLYURETHANE TOPCOAT is non-hazardous by EPA definitions. It does not contain lead or chromates. The solid and semi-solid sludge produced in spraying and clean up can be flocculated; dried and sent to a "Class B" landfill. Check with your local and state regulations for proper handling.

CHARACTERISTICS

• Excellent exterior durability
• Non-photochemically reactive
• Full gloss-80-85% at 60^o glossometer
• Available in satin to gloss finish
• Excellent hardness/impact resistance
• Excellent adhesion, mar, and abrasion resistance
• Coating will not flash rust on clean dry metals
• Coatings can be applied in a wide range of temperature and humidity without the use of retarders
• Linear flexibility is excellent on substrates such as Lexan, vinyl, and fiberglass
• Deionized water is used for reduction
• Excellent performance on most plastics
• Water is used for clean-up
• Non-Hazardous
• Air dry or force curing preferred
• Can be baked dry
• No discoloration or loss of flexibility when oven baked (250^oF for one hour)
• Wide range of colors
• Shelf life of 1+ years
• Unused paint can be returned to container
• Non-Flammable
• Metallics can be formulated

USES

• Steel, Steel Decks, Aluminum
• Fiberglass
• Wood
• Canvas
• Plastics
• Concrete
• PVC

AIR QUALITY DATA

• VOC (Volatile Organic Compounds) 2.1 lb/gal, 251 gm/lt.
• Free of lead and chromates
• Non-photochemically reactive

PHYSICAL DATA

• Liquid, clear
• Specific Gravity: 1.16
• Vapor Density: Heavier than air
• Evaporation Rate: Slower than ether
• VOC: 2.1 lb/gal, 251 gm/lt.
• Boiling Point: 340^oF (171^oC)
• % Solid by weight: 43%
• % Solid by volume: 39.2%
• Weight per gallon: 9.3 lbs.
• Flash Point: 150^oF CC

PERFORMANCE DATA
The tests below were conducted on Bonderite panels at 1-1.5 mil dry film thickness after 14 days cure time at a room temperature of 77^oF (25^oC). Each test rated excellent or no failure.

• Salt Spray: 500 hours
• Solvent Resistance: lacquer thinner, acetone, MEK, gasoline, xylene-50 double rubs with saturated cloth.
• Pencil hardness test to 4H
• Flexibility: 1/8" conical mandrel
• Impact Resistance: Forward-180 inch pound, Reverse-180 inch pounds
• Cold Check: 16 cycles: 24 hours @100% humidity, 24 hours @ 10^oF, 24 hours @ 77^oF.
• 15 minute 180^oF oven bake, immersion in boiling water 5 minutes
• Taber Abrasion: CS17 wheel, 1,000 gm load (100mg loss/1,000 cycles)
• Theoretical Coverage at 1 mil: 636 ft² (1624 x 39.2% solids by volume)

SPECIFICATIONS

• METALS: Surface must be free of grease, oil, dirt, and other foreign matter. Oxidation material must be removed or converted with Stewart Systems STEEL CONVERSION COATING. Priming with Stewart Systems PRIMER SEALER or a high quality 2-part epoxy primer is recommended. For compatibility with other primers, contact Stewart Aircraft Finishing Systems.
• PLASTICS: Good adhesion on most plastics. There are no solvents in Stewart Systems ONE-PART POLYURETHANE TOPCOAT to soften the substrate. Other plastic substrates must be evaluated. For good primer adhesion on plastics, use Stewart Systems SEALER.
• WOOD: Surface must be dry, sanded and dust free. Oil stains may not be used. For information on approved water base stains and sanding sealer, contact Stewart Aircraft Finishing Systems.

APPLICATION

• Spraying - reduce with distilled water to 20-25 seconds Dupont M50.
• Brushing or rolling: reduce with distilled water to 30-38 seconds Dupont M50.
• Stir contents before use. Never shake or stir under high agitation.
• Shelf life: 1+ years.
• Apply with standard equipment-pressure or suction feed, air assisted airless, HVLP, LVLP or electrostatic. Atomization pressure depends on viscosity.

CLEAN-UP WITH WATER

• If the paint dries, solvents may have to be used for clean up. If the spray equipment is not stainless steel, it is recommended to purge the gun with a solvent.

WEATHEROMETER

• QUV testing was run using the following cycles: 4 hours UV @131^oF/55^oC, followed by 4 hours of condensation @ 104^oF/40^oC with 30-minute cooling/dry off cycle. When Stewart Systems ONE-PART POLYURETHANE TOPCOAT is compared to a two-component catalyzed polyurethane, the initial gloss is about 28% less than the two component systems. However, the gloss can be improved by 20% with a clear coat. After a 1003.1-hour weatherometer test, the gloss exceeded other two component systems by 10-15%.

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