Standard · Application and film thickness
SSPC-PA 9
How many ultrasonic thickness readings to take on non-metal substrates, and how to judge them.
SSPC-PA 9 does for coatings on concrete and other non-metal substrates what SSPC-PA 2 does on steel: it says how many readings to take with an ultrasonic gauge and how to judge them. The gauge itself is operated to ASTM D6132.
The sampling
A spot is the average of at least three readings, as in PA 2, but taken within a larger circle, about 15 cm (6 in.) across. Five spots make an area of about 10 m², and the number of areas follows the size of the coated surface.
The trap
The spot circle is the difference to remember: 4 cm (1.5 in.) in SSPC-PA 2 on metal, about 15 cm (6 in.) in SSPC-PA 9. Older editions covered only cementitious substrates.
1 practice item in the members area mentions SSPC-PA 9 (CIP 2: 1).
Related
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This page describes the subject of SSPC-PA 9 in our own words; it does not reproduce the standard. For the full text, buy the current edition from AMPP. Checked on 2026-10-14; errors go in the corrections log. CoatMentor is an independent study aid. It is not affiliated with ISO, AMPP, SSPC, NACE International, ASTM or FROSIO.