AMPP, SSPC & NACE Explained

Anyone who reads a coating specification quickly meets three acronyms: NACE, SSPC and AMPP. They refer to the professional and standards bodies that shaped how industrial coatings and corrosion control are specified, applied and inspected in North America and, increasingly, worldwide. Understanding where each came from makes it much easier to read older specifications, interpret standard numbers and choose the right training or certification.

This article gives a general overview of the organizations and their documents. For the surface preparation standards themselves, see SSPC, NACE & ISO surface preparation standards.

The two legacy organizations

NACE International

NACE began in 1943 as the National Association of Corrosion Engineers, formed by engineers working on corrosion of buried pipelines. Its scope grew to cover corrosion control broadly: cathodic protection, materials selection, chemical treatment, corrosion monitoring and protective coatings. Over time the organization adopted the name NACE International to reflect its global membership. It became widely known for its Coating Inspector Program, its cathodic protection training and certification, and its standards for oil and gas, pipeline and process industries.

SSPC

SSPC was founded in 1950 as the Steel Structures Painting Council, a research and standards body focused on painting steel bridges, buildings and industrial structures. It later became SSPC: The Society for Protective Coatings. SSPC was best known for its surface preparation (SP) standards, its paint application (PA) standards, visual reference guides (VIS), and its contractor qualification programs, which many owners use to prequalify painting contractors.

The merger and the formation of AMPP

Because the two organizations had overlapping memberships and frequently collaborated, members voted in 2020 to combine them. The new body, the Association for Materials Protection and Performance (AMPP), began operating in 2021. AMPP took over the standards, training courses, certifications, publications and conferences of both predecessors.

In practice the transition is gradual. Existing standards keep their legacy designations until they are revised or reaffirmed, and new or revised documents may be issued under AMPP designations. Specifications written years ago still say “SSPC” or “NACE,” and that remains valid as long as the referenced edition is clear.

How the standard numbers work

Legacy designations follow consistent patterns, which helps when decoding a specification:

The joint surface preparation standards are the most widely cited documents in protective coating work. SSPC-SP 5/NACE No. 1 (white metal), SSPC-SP 10/NACE No. 2 (near-white metal), SSPC-SP 6/NACE No. 3 (commercial) and SSPC-SP 7/NACE No. 4 (brush-off) describe progressively less thorough abrasive blast cleaning. Waterjetting standards were also published jointly. These documents predate the merger by decades and are now maintained by AMPP.

Many specifications combine AMPP documents with ISO and ASTM methods. For example, a specification might require SSPC-SP 10/NACE No. 2 cleanliness, profile measured per ASTM D4417, and dry film thickness accepted per SSPC-PA 2. See key ASTM standards for coatings for the test methods that typically sit alongside them.

Certification and training programs

Both legacy bodies built training and certification programs that AMPP continues to run, with course names and structures that evolve over time. The main families are:

• Coating inspection. The Coating Inspector Program (CIP), with progressive levels, originated at NACE. SSPC offered its own inspector credentials, including a protective coatings inspector program and a concrete coatings inspector program. See coating inspector certification.
• Applicator qualification. SSPC developed courses and certifications for craft workers, such as abrasive blasting, airless spray and hazardous paint removal supervision, plus an industrial coating applicator specialist program developed jointly with NACE.
• Cathodic protection. NACE’s tiered CP certifications cover technician through specialist-level competency.
• Corrosion and coatings specialists. Senior credentials recognize broad technical expertise and experience.

Because names, prerequisites and renewal rules change, always confirm current requirements directly with AMPP before enrolling or before writing a credential into a specification.

Contractor qualification programs

The SSPC QP programs evaluate painting contractors’ management systems, safety programs, personnel qualifications and field performance through documentation review and audits. Commonly referenced programs include QP 1 for field application to complex industrial and marine structures, QP 2 for removal of hazardous coatings, and QP 3 for shop painting. Owners, particularly bridge and public works agencies, often require a specific QP certification as a bid condition. These programs continue under AMPP; see contractor qualification programs for how they compare with other schemes.

Using AMPP documents in practice

1. Identify each referenced document. List every SSPC, NACE or AMPP designation in the specification and note any edition dates.
2. Get the current text. Buy or access the documents through AMPP or an authorized distributor. Summaries and old copies are not a substitute.
3. Check for supersession. Confirm whether a standard has been revised, renumbered, combined or withdrawn, and agree on which version governs.
4. Align with product data. Make sure the manufacturer’s product data sheet requirements, such as minimum surface preparation, are compatible with the specified standard.
5. Document acceptance criteria. Record how compliance will be measured and by whom in the quality control plan.

AMPP also publishes technical reports, journals and conference proceedings, and runs a membership network of local sections. These are useful for continuing education, but they are not contract documents unless a specification explicitly incorporates them.

Frequently asked questions

Are NACE and SSPC standards still valid after the merger?

Yes. Legacy documents remain in force until revised, reaffirmed under a new designation, or withdrawn. Specifications that cite them are still enforceable, provided the edition is clear.

What does AMPP stand for?

The Association for Materials Protection and Performance, the organization formed when NACE International and SSPC combined. It began operating in 2021.

Is a NACE or SSPC certification still recognized?

Credentials earned under the legacy programs are generally carried forward by AMPP, subject to renewal rules. Check your status and renewal requirements directly with AMPP.

Why do surface prep standards have two numbers?

They were jointly developed and co-published, so each carries both an SSPC number and a NACE number, for example SSPC-SP 10/NACE No. 2 for near-white metal blast cleaning.