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WATERBORNE TWO-PART POLYURETHANE TOPCOAT

CHARACTERISTICS     USES     AIR QUALITY DATA    PHYSICAL DATA    PERFORMANCE DATA     SPECIFICATIONS    APPLICATION
Test Performance Data

PRODUCT DESCRIPTION
Stewart Aircraft Finishing Systems Waterborne Catalyzed  POLYURETHANE Topcoat  is a solvent free, water dispersible polyisocyanate. It provides outstanding coverage, excellent durability, and ease of application as well as being a low VOC and EPA compliant coating. Stewart Aircraft Finishing Systems Waterborne Catalyzed Polyurethane Topcoat offers superior adhesion and has film properties that exceed most solvent based catalyzed polyurethane systems.

ENVIRONMENTAL ADVANTAGES
STEWART AIRCRAFT FINISHING SYSTEMS WATERBORNE TWO-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 your local and state regulations for proper handling.

CHARACTERISTICS

• Excellent exterior durability
• Non-photo chemically reactive
• Full gloss – 92% 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 conditions without the use of retarders
• Linear flexibility is excellent on substrates such as Lexan, vinyl, and fiberglass
• Excellent retention of gloss in 1000 hour QUV weatherometer
• deionized water is used for reduction
• Excellent performance on structural plastics
• Water is used for clean-up
• Non-Hazardous
• Wide range of colors
• Shelf life - 1 year
• Non-Flammable
• Metallics can be formulated

USES

AIR QUALITY DATA

• VOC (Volatile Organic Compounds) 0.23 lb/gal, 27 gm/lt. when catalyzed

VOC’s Part A: 0.0 LB/gal, 0.0 gm/lt
VOC’s Part B: 0.9 LB/gal, 108 gm/lt

• Free of lead and chromates
• Non-photo chemically reactive

PHYSICAL DATA

• Liquid, clear
• Specific Gravity: >1
• Vapor Density: Heavier than air
• Evaporation Rate: Slower than ether
• VOC: 0.3 lb/gal, 36 gm/lt
• Boiling Point: 340^oF (171^oC)
• % Solids by weight: 47% when catalyzed
• % Solid by volume: 50% when catalyzed
• Weight per gallon: 9.4 lbs.
• Flash Point: 320^oF CC

PERFORMANCE DATA

The tests below were conducted on aluminum 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: 1000 hours
• Solvent Resistance: lacquer thinner, acetone, MEK, gasoline, xylene-100 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
• Taber Abrasion: CS17 wheel, 1,000 gm load (100mg loss/1,000 cycles)
• Theoretical Coverage at 1 mil: 812 ft² (1624 x 50% solids by volume)
• Gloss Retention: >90% gloss retention after 1000 hours QUV (Quantitative Ultraviolet light)

SPECIFICATIONS

• METALS:
  Steel Surfaces - Clean thoroughly of all dirt and oils.  Prime with   One-Part Primer/Sealer.  If the steel is lightly or moderately rusted, we recommend coating the surface with Stewart Systems Steel Conversion Coating.
  Aluminum Surfaces - Clean all surfaces with Stewart Systems EkoClean to remove oils and other contamination.  Then etch the surface with Stewart Systems EkoEtch  using an abrasive pad  and rinse well with clean water. After aluminum is completely dry apply Stewart Systems Waterborne  One-Part Primer/Sealer.
• PLASTICS: Good adhesion on structural plastics and Vinyls. There are no solvents in the Waterborne Two-Part Polyurethane to soften the substrate. Other plastic substrates must be evaluated. For good primer adhesion on plastics, use Stewart Systems Primers.
• 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 Systems.
• POLYESTER FABRIC: Surface must be clean and primed with CecoFill. For compatibility with other fabric primers, contact Stewart Systems.

APPLICATION

• Spraying: reduce with distilled water to 20-25 seconds DuPont M50.
• Brushing or rolling: reduce with deionized water to 30-38 seconds DuPont M50.
• Stir contents before use. Never shake or stir under high agitation.
• Shelf life: 1 year
• Apply with standard equipment-pressure or suction feed, air assisted airless, HVLP, LVLP or electrostatic. Atomization pressure depends on viscosity.
• May be force-dried with high air movement under 100°F. DO NOT BAKE

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 that the gun be purged with a solvent.  We recommend Lacquer Thinner.

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.

Test Performance Data

PRODUCT DESCRIPTION
STEWART  SYSTEMS WATERBORNE Catalyzed  POLYURETHANE TOPCOAT is a solvent free waterborne polyisocyanate. It provides outstanding coverage, excellent durability, and ease of application as well as being a low VOC and EPA compliant coating. STEWART  SYSTEMS WATERBORNE CATALYZED  POLYURETHANE TOPCOAT offers superior adhesion and has film properties that rival solvent based catalyzed polyurethane systems.

TESTING
STEWART  SYSTEMS WATERBORNE CATALYZED POLYURETHANE TOPCOAT has passed the following tests:

• ANSI Standard 255, 1-1973
• ASTM Standard G23-1969 Amended 1975
• ASTM Standard D523-1969 Amended 1972
• ASTM Standard D2794-1969 Amended 1974
• CGSB Standard 1-GP-71 Amended 1975
• CGSB Standard 31-GP-0 Amended September 1974
• CSA Standard CO5-176
• DMS-2115
• MIL-C-85285B(AS) American National Standard Institute
• American Society of Testing and Materials
• Canadian Government Specification Board
• Canadian Standards Association

PERFORMANCE

• HARDNESS – (500gm method 116.2 of CGSB standard 1-GP-71) no exposure of metal through the scratch in the film
• IMPACT RESISTANCE – ASTM Standard D2749 with Gardener Variable Impact Tester with 16mm diameter ball. Exceeds 1.8J and 180 inch pounds reverse and direct.
• FLEXIBILITY – Bend through 180° around 6mm-diameter mandrel bare side of specimen in contact with the mandrel. Temperature was 23° (+/- 2^o) C. Bending time not to exceed 1 second. No cracking or peeling when examined with unaided eye.
• FLEXIBILITY – Navy Weapons System Command – (-60oF/-51oC) over a ¹" mandrel on anodized aluminum panel – No cracking or peeling when examined with unaided eye.
• ADHESION – CGSB Standard 31-GP-0 Method 7.3. No removal of paint.
• OIL RESISTANCE – Half immerse test panel in Transformer oil conforming to CSA Standards C50 at 100^oC(212^oF)(+/- 1^o) for 120 hours. Remove and wipe with a clean lint free cloth. Allow panel to cool for 2 hours. No softening, surface disintegration, wrinkling, blistering, or loss of adhesion.
• OIL RESISTANCE – Passes MIL-C 85285 DI water, Lube oil, hydraulic fluid. Passes DMS 2115 skydrol resistance test.
• WATER RESISTANCE – Half immerse test panel in deionized water at 20^o-25^oC (68^o-77^oF) for 18 hours. Removed and wiped with clean lint free cloth. Allowed product to dry for 7 hours (less than 50% humidity). No wrinkling or blistering.
• SALT FOG RESISTANCE – Salt fog tests were conducted according to ASTM B117 standards.
• CORROSION RESISTANCE – Corrosion tests were conducted according to ASTM D610 which uses 10 to 0 scale with 10 indicating no rust and 0 indicating bad rust.
• BLISTERING – Blistering tests were conducted according to ASTM D714 which uses 10 to 0 scale with 10 indicating no blisters and 0 indicating the largest size blisters. Anodized aluminum test panel with Aircraft Finishing Systems Waterborne 2-Part Polyurethane and Aircraft Finishing Systems Waterborne 2-Part Epoxy Primer. Results of above test are as follows;
  • Duration: 1000 hours
  • Corrosion/rust: None
  • Blistering: None
  • Special Note: No filaform corrosion

• ACCELERATED WEATHERING – 1500 hours in arc weatherometer per ASTM Standard C23. No film degradation. Loss of gloss <10%.
• TESTS WERE CONDUCTED BY THE FOLLOWING:
  • McWhorter Technologies
  • Naval Air Warfare Center
  • McDonnell Douglas Aerospace
  • Buckman Laboratories
  • Hughes Aircraft

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