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Technical Bulletin

UC-5500
December, 1989
Supersedes all previous publications

UC-5500 SERIES POLYURETHANE COATINGS FOR SPRAY APPLICATIONS

GENERIC TYPE: A two package, polyurethane coating.

RECOMMENDED USAGE: An exterior coating for chemical process equipment, transportation vessels, storage tanks and other applications where flexibility, hardness, toughness, abrasion resistance and weatherability are required.

CHEMICAL RESISTANCE GUIDE:
EXPOSURE FUMES SPLASH & SPILLAGE
Acids Good Good
Solvents Excellent Good
Alkalies Excellent Excellent
Saltwater Excellent Excellent
Water Excellent Excellent
ORDERING INFORMATION:
  Shipping Weight:  
  UC-5500 Kit Approx 13 lbs/gal
  S-330 Solvents Approx 8.5 lbs/gal
  Packaging: UC-5500 series is available in 1 gallon and 5 gallon kits.
  Flashpoint (T.C.C.):  
  UC-5500 Part A 23°F (-5°C)
  UC-5500 Part B 91°F (33°C)
  S-330 Solvent 24°F (-4°C)
PHYSICAL DATA:  
  Solid by wt: approx 61%
  Solid by vol: approx 51%
  Note: Solids vary with color.
  Pot life: 6 hrs @ 70°F in unopened containers
  VISCOSITY: 90-95 K.U. (Krebs Units)
  TEMPERATURE LIMITATION: HERESITE UC-5500 accepts dry heat temperatures up to 350°F. Temperature excursions up to 400°F can be tolerated for short durations.
  VOC: 3.7 LBS/GAL AS SUPPLIED.
STANDARD COLOR  
  UC-5502 Black
  UC-5504 Brown
  UC-5506 Gray
  UC-5510 White
Other colors available upon request

COVERAGE: Theoretical coverage - 816 sq ft per gallon per mil. At 4.5 mils DFT average coverage would be 145 sq ft per gallon.

RECOMMENDED DRY FILM THICKNESS:
2.5 mils per coat
4-5 mils total dry film thickness

SURFACE PREPARATION: Remove all oil, grease and other contaminants. All seams should be continuously welded, weld splatter removed and all edges radiused. (See Bulletin #113, "Fabrication Specifications.")

STEEL: A commercial blast is acceptable in accordance with NACE #3 or SSPC-SP-6-62 specifications. Surface profile or anchor pattern shall be 20-25% of the recommended dry film thickness.

CONCRETE: Remove all protrusions by sanding or grinding. Concrete must be cured 28 days @ 70°F (21°C) and 50% relative humidity. Surfaces must be acid etched or abrasive blasted to remove laitance. Prime with UC-5400.

MIXING: Stir Part A thoroughly. Add the contents of Part B to the container of Part A. Mix thoroughly before using. (This mix ratio is 2 parts A to 2 part B by volume.) Mixed material must be used within 6 hours.

THINNING: The amount of thinner required is dependent upon temperature, ventilation, humidity, spray equipment used and desired film thickness. Suggested thinning at 75°F (24°C) is 10-20%.

EQUIPMENT

  1. All spray equipment shall be thoroughly cleaned and be free of old paint and other contaminants.
  2. Use standard production type spray guns
    Guns Fluid Air
    DeVilbiss JGA-502 E 704
    Binks #62 66-SS 66-SD
    Graco P800 04 02
  3. Air supply shall be uncontaminated.
  4. Airless spray equipment: 1500-1800 PSI liquid pressure. Tip Size from .015" to .019". Thinning requirements are less than for conventional spray.

APPLICATION

  1. Do not apply if temperature is less than 5°F (2°C) above dew point.
  2. Adjust air pressure to approx. 80 lbs. at the gun and provide 15-20# pot pressure. Adjust spray gun by first opening liquid valve and then adjust air valve to give approx. an 8"-12" fan.
  3. Holding gun perpendicular to the surface at a distance of 12", apply a mist bonding pass.
  4. Allow to flash off for several minutes, but not long enough to allow film to completely dry.
  5. Apply 3-4 criss-cross multi-passes maintaining a wet appearing film.
  6. Repeat step #5 until desired film thickness is obtained.
  7. Clean equipment immediately with HERESITE S-3300 solvent.
  8. Let first coat air dry with ventilation for approx. 16 hours.
  9. For second coat, repeat steps #1-#7.
  10. Coating should be final cured according to the following.
    130°F (55°C) - 8 hours
    190°F (82°C) - 2 hours

APPLICATION INSTRUCTIONS

These instructions are not intended to show product recommendations for specific service. They are issued as an aid in determining correct surface preparation mixing instructions, and application procedure. It is assumed that the proper product recommendations have been made. These instructions should be followed closely to obtain the maximum service from the materials.

CAUTION: CONTAINS FLAMMABLE SOLVENTS. KEEP AWAY FROM SPARKS AND OPEN FLAMES. IN CONFINED AREAS WORKMEN MUST WEAR FRESH AIR LINE RESPIRATORS. HYPERSENSITIVE PERSONS SHOULD WEAR GLOVES OR USE PROTECTIVE CREAM. ALL ELECTRIC EQUIPMENT AND INSTALLATIONS SHOULD BE MADE AND GROUNDED IN ACCORDANCE WITH THE NATIONAL ELECTRICAL CODE. IN AREAS WHERE EXPLOSION HAZARDS EXIST, WORKMEN SHOULD BE REQUIRED TO USE NONFERROUS TOOLS AND TO WEAR CONDUCTIVE AND NON SPARKING SHOES.

To the best of our knowledge the technical data contained herein are true and accurate at the date of issuance and are subject to change without prior notice. No guarantee of accuracy is given or implied. We guarantee our products to confirm to strict quality control. We assume no responsibility for coverage, performance or injuries resulting from use. Liability, if any, is limited to replacement of products. Prices are subject to change without prior notice. NO OTHER WARRANTY OR GUARANTEE OF ANY KIND IS MADE BY THE SELLER, EXPRESS OR IMPLIED, STATUTORY, BY OPERATION OR LAW, OR OTHERWISE, INCLUDING MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

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