Astm A755m - 11
Astm A755m - 11
Astm A755m - 11
1. Scope* priate safety and health practices and determine the applica-
1.1 This specification covers steel sheet metallic coated by bility of regulatory limitations prior to use.
the hot-dip process and coil-coated with organic films for
exterior exposed building products. Sheet of this designation is 2. Referenced Documents
furnished in coils, cut lengths, and formed cut lengths. Build- 2.1 ASTM Standards:2
ing products include corrugated and various types of roll and A463/A463M Specification for Steel Sheet, Aluminum-
brake-formed configurations. Coated, by the Hot-Dip Process
1.2 The substrate is available in several different metallic- A653/A653M Specification for Steel Sheet, Zinc-Coated
coated steel sheet products as enumerated in 4.1, depending on (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed)
the requirements of the purchaser. by the Hot-Dip Process
A792/A792M Specification for Steel Sheet, 55 %
1.3 Coating systems supplied under this specification con- Aluminum-Zinc Alloy-Coated by the Hot-Dip Process
sist of a primer coat covered by various types and thicknesses A875/A875M Specification for Steel Sheet, Zinc-5 % Alu-
of top coats. The combination of primer and top coat is classed minum Alloy-Coated by the Hot-Dip Process
as either a two-coat thin-film system or as a two-coat (or more) A902 Terminology Relating to Metallic Coated Steel Prod-
thick-film system. Typical top-coating materials are: polyester, ucts
silicone polyester, acrylic, fluoropolymer, plastisol, or polyure- A924/A924M Specification for General Requirements for
thane. Steel Sheet, Metallic-Coated by the Hot-Dip Process
1.4 This specification is applicable to orders in either A1046/A1046M Specification for Steel Sheet, Zinc-
inch-pound units (as A755) or SI units [as A755M]. Values in Aluminum-Magnesium Alloy-Coated by the Hot-Dip Pro-
inch-pound units and SI units are not necessarily equivalent. cess
Within the text, SI units are shown in brackets. Each system A1063/A1063M Specification for Steel Sheet, Twin-Roll
shall be used independently of each other. Cast, Zinc-Coated (Galvanized) by the Hot-Dip Process
B117 Practice for Operating Salt Spray (Fog) Apparatus
1.5 Unless the order specifies the “M” designation (SI units)
D522 Test Methods for Mandrel Bend Test of Attached
the product shall be furnished to inch-pound units.
Organic Coatings
1.6 The text of this specification references notes and D523 Test Method for Specular Gloss
footnotes that provide explanatory material. These notes and D659 Method for Evaluating Degree of Chalking of Exterior
footnotes, excluding those in tables and figures, shall not be Paints (Withdrawn 1990)3
considered as requirements of this specification. D714 Test Method for Evaluating Degree of Blistering of
1.7 This standard does not purport to address all of the Paints
safety concerns, if any, associated with its use. It is the D822 Practice for Filtered Open-Flame Carbon-Arc Expo-
responsibility of the user of this standard to establish appro- sures of Paint and Related Coatings
1 2
This specification is under the jurisdiction of ASTM Committee A05 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Metallic-Coated Iron and Steel Productsand is the direct responsibility of Subcom- contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
mittee A05.11 on Sheet Specifications. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved Nov. 1, 2011. Published November 2011. Originally the ASTM website.
3
approved in 1978. Last previous edition approved in 2008 as A755/ The last approved version of this historical standard is referenced on
A755M – 03(2008). DOI: 10.1520/A0755_A0755M-11. www.astm.org.
(Mandatory Information)
A1. ASTM METHODS FOR TESTING PHYSICAL AND MECHANICAL PROPERTIES OF COIL COATINGS
A1.1 Requirements for physical and mechanical tests which ASTM Standard
Test
are mandatory at the time of production are as follows:
Dry Film Thickness ...
ASTM Standard Solvent Resistance D5402
Test
T-Bend D4145
Durometer Hardness D2240
Elongation of Attached Coating Gloss D522 Tensile Properties D2370
D523 Cross Hatch Adhesion D3359
Color D2244
Pencil Hardness D3363
APPENDIX
(Nonmandatory Information)
X1.1 Tests for the performance evaluation of coil coatings ASTM Standard
Test
which are not necessarily mandatory at the time of coating:
Artificial Weathering D822
ASTM Standard Water Immersion D870
Test
Water Fog D1735
Humidity D2247
Degree of Blistering D714 Painted Specimens Subjected to Corro- D1654
Chalk Resistance D4214 sive Environments
Salt Spray B117
Modified Salt Spray G85, Modified A5
Weatherometer D659
SUMMARY OF CHANGES
Committee A05 has identified the location of selected changes to this standard since the last issue
(A755/A755M - 03(2008)) that may impact the use of this standard. (November 1, 2011)
(1) Added references to A1046/A1046M and A1063/A1063M (2) Revised 5.2.10 and added 5.2.13.1.
to 2.1 and 4.1.
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