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ASTM materials and coatings · Lesson 3 of 4

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.

10 min · 12 slides · 8 questions

All lessons in this module
Slide 1 of 12

A five-line material callout

This module teaches a five-line callout: metal and its ASTM standard, thickness in the metal's own unit, coating designation, finish system, and the edition rule.

It is a method for checking a reference, not an ASTM or AFS requirement.

Writing every line stops a bare "galvanized" or "ASTM A653" from standing in for a decision.

The five-line material callout as a sequenceA top-to-bottom flow of five boxes joined by arrows: 1 the metal and its ASTM standard, 2 thickness in the metal's own unit, 3 the coating designation from the same standard, 4 the finish system, and 5 the edition rule. A footer says this is a teaching method, not an ASTM or AFS requirement.Writing the five-line callout, in order1Metal and its ASTM standardone metal, one standard2Thickness in the metal's own unitgauge, inch, ounce or millimetre3Coating designationfrom that same standard4Finish systema system, not only a color5Edition rulewhich edition applies, and when readA teaching method, not an ASTM or AFS requirement.

A top-to-bottom flow of five boxes joined by arrows: 1 the metal and its ASTM standard, 2 thickness in the metal's own unit, 3 the coating designation from the same standard, 4 the finish system, and 5 the edition rule. A footer says this is a teaching method, not an ASTM or AFS requirement.

1
Metal and its ASTM standard
2
Thickness in the metal's own unit: gauge, decimal inch, ounce or millimetre
3
Coating designation, such as G90 or AZ55, from the same standard
4
Finish system, named as a system and not only a color
5
Edition rule: which edition applies, and the date its status was read
Write the callout one line at a time, in this order. It is this module's method for checking a reference, not an ASTM or AFS requirement.

Sources

Glossary

Callout
The lines of a specification or drawing that name a material: its metal, ASTM standard, thickness, coating designation and finish.
Triple-spot test (TST)
The average of three edge-center-edge readings of coating weight, total on both sides, which a designation such as G90 sets a minimum for.
Mil
A thousandth of an inch; GalvInfo gives coating thicknesses of about 1.6 mils for G90.
Total both sides (TBS)
A coating weight counted over both faces of the sheet together, as G90 and AZ55 are, not per face.