SSPC-PA 7: Applying Thin Film Coatings to Concrete

SSPC-PA 7: Mastering the Application of Thin Film Coatings to Concrete

For engineers and specifiers tasked with protecting and enhancing concrete structures, understanding the nuances of coating application is paramount. SSPC-PA 7: Applying Thin Film Coatings to Concrete provides an essential framework for achieving durable and effective protective systems on concrete substrates. This authoritative standard ensures that critical infrastructure, industrial facilities, and architectural elements benefit from proven coating methodologies.

What is SSPC-PA 7?

SSPC-PA 7 is an industry-leading standard developed by SSPC: The Society for Protective Coatings. It meticulously outlines the procedural requirements for applying thin film organic coatings to concrete surfaces. Its primary purpose is to ensure the successful and long-lasting performance of these coatings by detailing proper application techniques, thereby preventing premature failure and maximizing the protective lifespan of the concrete asset.

Scope & Purpose

This standard specifically governs the application of thin film organic coatings (defined as those with a dry film thickness under 500 micrometers or 20 mils) to concrete. It details acceptable application methods, including brushing, rolling, and spraying. SSPC-PA 7 does not cover surface preparation, coating material selection, or application to concrete floors and similar surfaces requiring thicker trowel-applied coatings. Its focus is solely on the execution of the coating application itself.

Who Must Comply?

• • Primary audience: Coating Inspectors, Project Managers, Application Supervisors, Specification Writers, Owner Representatives, and skilled Applicators.
• • Industries affected: Construction, Infrastructure (bridges, tunnels, water/wastewater treatment), Chemical Processing, Manufacturing, and any sector utilizing protective coatings on concrete.
• • Compliance nature: While often specified by owners and project requirements, compliance is generally considered a best practice and a contractual obligation when included in project specifications.
• • Enforcement: Compliance is typically monitored by the Owner Representative and verified by the Coating Inspector through site observations and testing.

Key Requirements Overview

The standard requires professionals to adhere to manufacturer's written instructions for mixing all coating components to ensure complete uniformity. Key provisions include ensuring that coating materials are handled and used only if they are within their stated shelf life and have not deteriorated during storage. Applicators must ensure that the concrete substrate is free from contaminants that could affect adhesion and that environmental conditions (temperature, humidity) are within acceptable limits for the specified coating system. Furthermore, the standard mandates proper application techniques to achieve uniform film thickness and prevent defects such as runs, sags, or pinholes.

Related Standards & References

SSPC-PA 7 works in conjunction with several other comprehensive standards. SSPC-SP 13/NACE No. 6 provides guidance on the crucial surface preparation of concrete. ASTM D 4138 and ASTM D 6132 are vital for verifying the dry film thickness of applied coatings, ensuring compliance with the "thin film" definition. For understanding coating compatibility and performance, standards like ASTM D 5064 (Patch Test) and NACE RP0188 (Holiday Testing) are often referenced alongside PA 7.