Elastocoat Protective Coatings APPLICATION GUIDE

Transcription

1 Elastocoat Protective Coatings

2 DESCRIPTION Elastocoat polyurea and polyurethane coatings are two-component, 100% solids elastomer systems. The coatings systems are designed for processing through plural component high-pressure impingement-mix polyurethane dispensing equipment. Elastocoat protective coatings are multi-purpose materials, designed for variety of applications. the desired performance and suitability of use must be tested and qualified by the end user. SCOPE This application guide defines the application requirements for Elastocoat polyurea and polyurethane coatings for typical applications. Elastocoat coating systems can be applied in both factory or field environments. Contact your BASF representative with questions concerning additional application details. General safety and handling are covered in this document. Please refer to specific product safety data sheets for more information. REQUIREMENTS The guidelines and standards presented in this document are to be used solely as a guideline. BASF recommends that a copy of this Application Guideline be made available at the application site, at all times, and that all employees involved in the application. The following standards shall be included as part of this guideline. SSPC-SP1 SSPC-SP10/NACE No.2 SSPC-SP11 SSPC-VIS-1-89 RP SP APPLICATION RATE Solvent Cleaning Near-White Metal Blast Cleaning Power Tool Cleaning to Bare Metal Pictorial Surface Preparation Standard NACE Standard Recommended Practice for Field Measurement of Abrasive Blast Cleaned Surfaces Using Replica Tape NACE Discontinuity (Holiday) Testing of New Protective Coatings on Conductive Substrates The typical dry film thickness of a Elastocoat polyurea and polyurethane coating is mils. This will usually provide adequate chemical resistance, resistance to mechanical damage and weatherability. Specific applications will require specific recommended thickness based on substrate and application. Longevity of service is directly proportional to the total membrane thickness. As a result, many engineers, architects and owners are specifying dry film thickness as great as 100 mils (2.5 mm) to obtain maximum service life. Rev. 03/05/ BASF corporation 2

3 SURFACE PREPARATION Elastocoat polyurea and polyurethane coating systems are formulated with some remarkable physical properties including enhanced adhesion, but all successful applications require proper surface preparation and testing. In addition to proper surface preparation procedures and techniques, the use of primers is strongly recommended in most applications. CONCRETE AND MASONRY All grease compounds, old coatings, loose concrete and other foreign matter on the surface should be removed by sandblasting, shot blasting, mechanical scarification or suitable chemical means in accordance with ASTM D Note: All abrasives used shall be clean, uniform grade and appropriately sized to obtain the required grip enhancing surface profile. Clean all surfaces of dust after blasting. Vacuum cleaning is mandatory immediately prior to application of the concrete primer. Concrete must be primed with an epoxy primer prior to the application of the polyurea/ polyurethane coating. Cracks in the concrete should be repaired using material that is compatible with the primer system. Any bug holes should be filled the same. Sharp or rough surfaces should be ground below the surface and patched to avoid protrusions. New concrete should cure for a minimum of 28 days at 70 degrees F (21C) and should be tested in accordance with ASTM D 4263 Standard Test Method for Indicating Moisture in Concrete prior to application. Moisture in the concrete should not exceed 4% maximum. Concrete systems often require vapour barriers or other means of waterproofing to prevent water intrusion, which can ultimately lead to delamination and failure of the coating system, especially when applied to concrete at or below grade. In applications where the coating is being applied to an interior surface at or below grade, the unprotected side of the concrete must have a vapour barrier. To minimize outgassing from the porous surface of the concrete, apply primers and coatings when the air and surface temperatures are falling. It is strongly recommended that a test area be completed prior to proceeding to the full application to ensure that additional preparation steps are not required. STEEL Steel surfaces must be free from rust, salts, dirt and any other contaminants in accordance with SSPC-SP1. Any welds shall be free of voids and spurs and sharp protrusions should be ground smooth. The steel surface should be blasted to near white finish in accordance with SSPC-SP-10/NACE No. 2. The blast medium used should be clean, dust-free, hard, sharp and angular. Be sure to test the surface conditions prior to application of the primer and polyurea/polyurethane system. Apply coating only if the steel temperature is a minimum of 5 F(3 C) above the dew point. Rev. 03/05/ BASF corporation 3

4 APPLICATION EQUIPMENT The polyurethane should be applied at specify volume ratio using plural component, high-pressure metering machine. The machine must maintain component temperatures of at least 150ºF (66ºC) at the spray gun, as well as operating pressures up to 3000 psi. An impingement mix, airless spray gun with changeable spray tips, which allow for the optimization of the spray pattern, will be required. COATING APPLICATION Materials should be applied according to the guidelines listed herein. No thinning of the material is allowed. All coating thickness should be set by the engineer or end user. Coating thickness should be measured and recorded in a manner acceptable to the end user such as SSPC-PA-2. Environmental conditions, substrate preparation and material requirements should follow the guidelines listed in this document as well as on the Technical Product Data Sheet. Spray application should be done in a manner that is uniform, continuous and free of runs and sags. Refer to the specific Technical Product Data Sheet for specifics related to the cure time required before placing the system into service. Apply coating only if the steel temperature is a minimum of 5 F(3 C) above the dew point. It is recommended that the applicator keep daily records of the following: 1) Processing parameters (equipment, spray gun, chambers, etc) 2) Chemical temperatures 3) Chemical pressures 4) Surface and ambient temperatures 5) Relative temperatures 6) Dew point INSPECTION TESTING The finished part should be visually inspected for any defects (i.e. cracks, blisters, pin holes or uncoated areas). Coating thickness should conform to the minimum listed in the guideline, as well as the engineering requirements. Rev. 03/05/ BASF corporation 4

5 HEALTH AND SAFETY It is important that all safety instructions be read and understood by all personnel who will come into contact with the materials. If the safety instructions are lost or otherwise not available, please contact BASF Corporation for a replacement. A BASF Safety Data Sheet (SDS) is sent with the original shipment and available upon request. All personnel who come in contact with the product should read and understand the MSDS. AEROSOL AND VAPOR INHALATION problems are characterized by coughing, shortness of breath, or tightness in the chest. Anyone exhibiting these symptoms shall be immediately removed from the workplace and administered oxygen or fresh air. If the condition is prolonged or extreme, SEEK EMERGENCY TRAINED MEDICAL ATTENTION IMMEDIATELY. SKIN CONTACT with liquid components can result in rash or other irritation. Wipe residual liquid with clean soft cloth followed by washing with soap and water. If a rash or other irritation develops, SEE A PHYSICIAN. EYE CONTACT with liquid or sprayed components can result in corneal burns or abrasion. Upon exposure, eyes should be flushed with water for and extensive period. SEEK MEDICAL ATTENTION IMMEDIATELY. Rev. 03/05/ BASF corporation 5