1. Scope
1.1 This specification covers an air-drying, ready-mixed, pigmented, waterborne (i.e., water-reducible) alkyd or modified alkyd pigmented primer for blast cleaned steel. It is intended as the first coat of a waterborne coating system consisting of one or two coats of this primer and one or two coats of a waterborne topcoat.
1.2 This primer is suitable for exposures in Environmental Zones 1A (interior, normally dry), 1B (exterior,
normally dry), 2A (frequently wet by fresh water [excluding immersion]) and 2B (frequently wet by salt water [excluding immersion]). See Note 11.1.
1.3 This primer is intended for brush, spray, or roller application over steel surfaces prepared in accordance with SSPC-SP 6, "Commercial Blast Cleaning." It is suitable as a shop primer, field primer, maintenance primer, or intermediate coat, and is to be applied in accordance with SSPCPA 1, "Shop, Field, and Maintenance Painting of Steel." If the primed part of the structure is to be exposed to the
weather, it should be topcoated as soon as practical, according to the manufacturer's published instructions.
1.4 This specification does not include primers based on latex polymers, which are described in SSPC Painting System 24.00.
2. Description
2.1 COMPOSITION
2.1.1 This primer is based on an ambient drying single package vehicle which is rendered water-reducible via ionic solubility of the resin and appropriate pigments.
2.1.2 The polymer types are alkyds and copolymer alkyds (see Note 11.2). Latex polymers are excluded from this specification.
2.1.3 The major volatile component by weight shall be water; however, volatile organic compounds may be present.
2.2 VOLATILE ORGANIC COMPOUND (VOC) CONTENT:
2.2.1 The VOC content of the primer shall be determined from the coating as applied, after recommended
thinning. (See Section 4.2 and Note 11.4.)
2.3 PERFORMANCE LEVELS:
2.3.1 Primers shall be classified according to the performance achieved as follows:
Level 1: Laboratory Testing (Section 5)
Level 2: Exterior Exposure (Section 6)
2.3.2 If no performance level is specified, Level 2 is assumed.
