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Tier 6 · Architectural Specification and Engineering

ASTM materials and coatings

How to read an ASTM designation and its edition, which standard covers galvanized, 55 % aluminum-zinc, prepainted, aluminum, copper, zinc and stainless sheet, what G90 and AZ55 mean, and how to check a submittal against a callout.

4 lessons · about 46 min · 11 diagrams · 0 videos

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0 of 4 complete

  1. Lesson 1 · 12 min · 10 slides · 10 questions

    ASTM materials and coatings: principles and terminology

    How an ASTM designation is built, what its year and suffix tell you, how a specification differs from a practice and a test method, and why a flashing reference must name the standard and its edition.

    You will be able to: Read an ASTM designation (letter, number, year, suffix and metric companion), name the six main types of ASTM document, and say what this module will and will not reproduce from a standard.

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  2. Lesson 2 · 13 min · 12 slides · 11 questions

    ASTM materials and coatings: materials, standards and design constraints

    Which ASTM standard covers galvanized, 55 % aluminum-zinc, prepainted, aluminum, copper, zinc and stainless sheet, what G90 and AZ55 mean, and why the same number does not mean the same coating.

    You will be able to: Match each flashing metal and coating to the ASTM standard that usually covers it, read a coating weight designation, and tell a product specification from a finish performance specification.

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  3. Lesson 3 · 10 min · 12 slides · 8 questions

    ASTM materials and coatings: methods and worked application

    A five-line callout method, then worked examples: reading A653/A653M-25a, converting G90 to SI, working out coating thickness from a designation, and seeing why a gauge-table row is not a coating designation.

    You will be able to: Write and check a five-line material callout, convert a coating designation between unit systems, work out the thickness it implies, and record the assumptions behind each number.

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  4. Lesson 4 · 11 min · 11 slides · 9 questions

    ASTM materials and coatings: defects, verification and case study

    The three defects that make a material callout fail review, how to check a submittal line by line, how the G90 average and single-spot minimums decide a result, and a constructed case where A653 G90 meets AZ55 on A792.

    You will be able to: Check a submittal against a specification callout, read a G90 coating weight spot check, and handle a callout that names two different coatings, with the evidence recorded.

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Practical task

Write a five-line material callout for one flashing material named in a project specification, then check a supplier submittal against it: read each designation, compute the coating weight in both unit systems and the minimum thickness it implies, and document what matches, what does not and who must decide.

Hand in

  • The five-line callout: metal and ASTM standard with edition, thickness in the metal's own unit, coating designation, finish system, and the edition rule, with the source of each line
  • A reading of every designation in the callout and the submittal, letter by letter, as in the designation figure
  • The arithmetic: the coating weight in oz/ft² and g/m², and the minimum thickness in mil from GalvInfo's factor, with every input named
  • A status table: each standard's edition status as listed on ASTM's page, with the date you read it
  • A mismatch note: each line where the submittal and callout differ, why it matters, and the question for the specifier

Rubric

CriterionMeets the standard when
DesignationsEach designation is read correctly: subject letter, number, SI companion, year, suffix and any reapproval year.
Standard and coatingThe coating designation matches its own standard (G with A653, AZ with A792) and no two coatings are named together.
ArithmeticWeight and thickness are computed from the stated factors, with units, and are labelled as minimums computed from a designation.
Edition statusEach edition status is taken from ASTM's own page and dated, not assumed.
Sources and ownershipEach value says who stated it; no ASTM standard text is copied and no AFS designation is invented.
EscalationA contradiction goes to the specifier in writing; the packet never substitutes one coating for another.

Module quiz

10 questions drawn from a bank of 38; a new set each attempt. Pass mark 85%.

1. To which sheet does GalvInfo say the triple-spot test applies?
2. What does A924/A924M set for hot-dip metallic-coated steel sheet?
3. What does "(Reapproved 20__)" name?
4. On 2026-11-10, how did ASTM's store page label the A924/A924M-25a edition?
5. In A653/A653M-25a, what does the "25" tell you?
6. What SI designation does GalvInfo give as its example for G90?
7. How is the lead applied to ASTM B101 lead-coated copper?
8. In A755/A755M-18(2024), what does the 2024 show?
9. What does G90 mean in ASTM A653/A653M?
10. What does the M in A653/A653M show?