This specification covers an ambient temperature curing, two-component water-borne epoxy coating for steel that is intended for use as a primer of a multicoat waterborne epoxy or other coating system.
Primer coatings are categorized according to performance levels (Sections 2.3, 6, and 7).
Properly topcoated primers meeting this specification are suitable for exposures in Environmental Zones 1A (interior, normally dry), 1B (exterior, normally dry), 2A (frequently wet by fresh water), 2B (frequently wet by salt water) and 3C (chemical exposure, alkaline).
The specified primer is intended for application by brush, spray, or roller over steel surfaces prepared in accordance with the manufacturer's recommendations. It is suitable as a shop primer, field primer, maintenance primer, or intermediate coat and is to be applied in accordance with SSPC-PA 1. Manufacturer's recommendations should be followed when the primed steel is to be weathered prior to topcoating.
COMPOSITION:
1) The primer specified is typically based on a reactive oxirane (epoxy) functional resin with amine or acid functional curing agents (see Section 4.1).
2) The major volatile component by weight is water. Refer to ASTM D 3792 or ASTM D 4017 for determining water content of paints.
VOC LEVEL: The specified primer may or may not comply with all air pollution regulations. Consult applicable government regulations to determine maximum allowable volatile organic compounds (VOC) and proper VOC test method for a particular application. Supplier should provide VOC information on the coating as supplied (in the container) and as applied (in the field after recommended thinning). See Notes 12.2 and 12.3.
PERFORMANCE LEVEL: Primers shall be classified according to the exposure performance achieved as follows based on testing of two coats of primer:
Level 1: Accelerated Testing (Section 6)
Level 2: Exterior Exposure (Section 7) 2.3.1 If no performance level is specified, Level 2 is assumed.
