Heresite Logo

Technical Bulletin

P-750
JUNE '92
Supersedes all previous publications

HERESITE P-750 WASH PRIMER

GENERIC TYPE: A two package, acid catalyzed zinc chromate wash primer to be used when acid etching or sandblasting is impractical.

RECOMMENDED USAGE: Heresite P-750 is used as a shop primer for bare steel or as a field maintenance primer over steel, aluminum or galvanized steel. It has excellent weathering capabilities when used with the VR-500 Series. P-750 can be brush or spray applied.

Whenever a recommendation is required concerning chemical or corrosive resistance of a Heresite coating, it is suggested a complete product description be forwarded. Our recommendation will be returned promptly.

ORDERING INFORMATION:

SHIPPING WEIGHT:		  
  P-750 Coating Approx. 10 lb.s/gal.
  S-232 Solvent  

FLASHPOINT: 24°F (-5°C)
  P-4402 60°F (17°C)
  S-215 62°F (17°C)
  S-225 62°F (17°C)

PHYSICAL DATA: (depends on color)
  Solids by wt: Approx. 70-92%
  Solids by vol: Approx. 54.5-57.0%
  Pot Life: N/A
  Shelf Life: 4 mos. @ 70°F (21°C)
  Viscosity: 80-100 K.U. (Krebs Units)

ABRASION RESISTANCE: A 40mg loss is observed with a Tabor Abrasor CS-17F wheel with a 1000 g. weight for 1000 cycles.
THERMAL CONDUCTIVITY: BTU per HR. per sq. ft. per °F per mil thickness. 7000
HARDNESS (Tabor Shear): 1400
THERMAL EXPANSION COEFFICIENT: 2.5 x 10 -5 per °C
TEMPERATURE LIMITATIONS: Heresite P-4403 accepts dry heat temperatures up to 400°F (205°C)
V.O.C.: 2.8 lbs./gal. as supplied
STANDARD COLOR: P-4403 -- Brown
COVERAGE: Theoretical coverage -- 892 square feet per gallon per mil. Recommended total dry film thickness is 5.0 to 7.0 mils in a 3-5 coat system*

At 6 mils DFT average coverage would be 119 square feet per gallon. This includes a 20% loss factor.

*Recommended DFT may vary depending upon metal conditions and service -- Please contact your Representative or the main office for your specific applications.
SURFACE PREPARATION: Remove all oil or grease from the surface with an appropriate solvent.
STEEL: A white metal blast is required in accordance with NACE#1 or SSPC-SP-5-63 specifications.
NON-IMMERSION: A commercial blast is acceptable in accordance with NACE #3 or SSPC-SP-6-63 specifications
Surface profile or anchor pattern shall be 20 to 25% of the recommended dry film thickness.
PRIMER: Self-priming
MIXING: Mix thoroughly and adjust viscosity per manufacturer's recommendations.

Conventional spray - #4 Zahn 15-18 sec.
Airless spray - #4 Zahn 18-20 sec.
THINNER: Under normal circumstances we recommend use of Heresite S-215 Solvent. In hot weather or open rooms, we suggest Heresite S-225.
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 15-25%
BAKE SCHEDULE:
Iintermediate Bake
 Surfaces
175°F-200°F (93°C)for 10-20 min.

Surfaces
400°F (204°C) for 1-1½ hr.
APPLICATION:
  1. Do not apply if temperature is less than 5°F (2°C) above dew point, or if temperature is below 45°F(7°C).
  2. All spray equipment shall be thoroughly cleaned and the hoses in particular shall be free of old paint film and other contaminants.
  3. Use standard production type spray guns, such as:
    Guns Fluid Air
    DeVilbiss JGA-502 E 704
    Binks #62 66-SS 66-SS
    Graco P800 04 02
    May also be applied with airless spray equipment.
  4. Air supply shall be uncontaminated. Adjust air pressure to approximately 50lbs. at the gun and provide 14-20# pot pressure. Adjust spray gun by first opening liquid valve and then adjust air valve to give approximately an 8" to 12" fan, holding gun perpendicular to the surface at a distance of 12".
  5. Apply a mist bonding pass.
  6. Allow to flash off for several minutes, but not long enough to allow film to completely dry.
  7. Apply 2 to 4 criss-cross multi-passes maintaining a wet appearing film. Approximately 2 to 4 mils wet film thickness equals approximately 1.5 mils dry film thickness.
  8. Air dry, with ventilation.
CURING SCHEDULE:
AIR DRY SCHEDULE:
6-8 hours per coat @ 70°F(21°C).
FORCE CURE SCHEDULE:
20 minutes per coat @ 250°F(121°C).
CLEAN UP:
Use Heresite S-440 Solvent
STORAGE CONDITIONS:
Coating should not be stored longer than 24 months. Storage at above 80°F(27°C) may shorten shelf life.

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.

HOME * PRODUCTS TRADITION
CONTACTS MARKETS ON-LINE FORM