PDF《Polibrid 705E Application Guidelines》

SAFETY APPENDIX C FABRICATION RECTIFICATION ID 705E_UK Rev.

02 Date 12/08/16 Polibrid 705E Page

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22 1. POLIBRID 705E SPECIFICATION 1.1 Surface Preparation In common with most protective coatings schemes, the performance level of Polibrid 705E is ultimately determined by degree of surface preparation. The higher the degree of surface preparation achieved, the greater the long-term performance. For optimum performance, all surfaces to be coated should be clean, dry and free from contamination including dirt, salts, oil and grease. Steel Prior to paint application all surfaces should be assessed and treated in accordance with ISO 8504:2000. Where necessary, remove weld spatter and smooth weld seams and sharp edges (see Appendix 1). In cases where the substrate is corroded or pitted, it may be necessary to fresh water wash the areas after abrasive blasting, then re- blast, in order to ensure complete removal of soluble corrosion products. The maximum allowed total soluble salt contamination on the steel before application of the Polibrid 705E is 10?g/cm

2 . Acceptable levels of soluble salts are ・ Chlorides : Less than 3?g/cm

2 (3ppm) ・ Sulphates : Less than or equal to 5?g/cm2 (5ppm) ・ Nitrates: Less than or equal to 5?g/cm2 (5ppm) See section

3 for more details regarding measurement. All steel surfaces to be coated should be correctly prepared prior to application of the coating system. Abrasive grit blast the steel to be coated to a minimum of ISO Standard 8501-1:2007 Sa2? or SSPC SP10. A sharp and angular surface profile of

90 microns (3.6 mils) minimum is required. Polibrid 705E may not be applied to flash- rusted surfaces or to existing coatings. Examples of abrasive that may be used to achieve a sharp, angular profile of

90 microns include (but not limited to): Unrecycled 20-40 garnet Unrecycled 12-25 garnet Steel grit G24 or higher Concrete New concrete shall be properly cured prior to the application of Polibrid 705E;

minimum cure time is

28 days or until which time the moisture content test is passed according to ASTM D4263 '

Standard Test Method for Indicating Moisture in Concrete by the Plastic Sheet Method'

. Laitance and efflorescence shall be removed. Moisture content must also be checked to make sure it is below 7% prior to coating application or by the method described in ASTM D 4263,. Direct application to old concrete surfaces which are damp, but not moist or wet requires the use of a geotextile fabric reinforced Polibrid system. The tensile strength of the concrete should be minimum 2MPa (300psi). The presence of oil, grease and release agents in concrete may cause loss of coating adhesion. Although the surface may appear free of any oil, solvents in the coating material can draw the oil from within the concrete to the coating/concrete interface. Surface preparation of concrete should be done in accordance to SSPC-SP13/NACE 6. All chemical contamination must be removed prior to the application of Polibrid 705E or optional Polibrid 670S primer. Contamination includes efflorescence, laitance, oils, chemicals, acids, salts, alkalis, curing compounds, form release agents, and microorganisms. ID 705E_UK Rev.

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22 All existing coatings and sealers must be removed to ensure proper bond between the concrete substrate and lining. Only small sections of existing coatings that are very firmly adhered and greatly resist removal may remain, however, these sections........