ASTM D Pracfice for Preparafion of Zinc. (Hot-Dip Galvanized) Coated Iron and Steel. Product and Hardware Surfaces for Painfing. The Thurston Avenue. 1 Jan Buy ASTM D PRACTICE FOR PREPARATION OF ZINC (HOT-DIP GALVANIZED) COATED IRON AND STEEL PRODUCT AND. This standard is issued under the fixed designation D ; the number 1 This practice is under the jurisdiction of ASTM Committee D01 on Paint and. Related.

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The material provided herein has been developed to provide accurate and authoritative information about after-fabrication hot-dip galvanized steel.

This practice does not apply to sheet galvanized steel products nor to the coil coating or continuous roller coating processes. The first notable difference is D allows s6386 the application of wash primers i. Link to Active This link will always route to the current Active version of the standard.

Difference Between ASTM D and… | American Galvanizer’s Association

Galvanized surfaces may have been wstm with protective coatings to prevent the occurrence of wet storage stain. The second notable difference between the two specifications is D gives guidance for thermal pretreatment or baking of the galvanized steel prior to powder coating, whereas D does not. This practice covers surface preparation on iron and steel products and hardware that have not been painted previously.


The information provided herein is not intended as a representation or warranty on the part of the AGA. Thermal pretreatment of galvanized steel is necessary prior to powder coating to prevent outgassing of the galvanized coating during the baking step in the powder coating curing process.

Historical Version s – view previous versions of standard. Anyone making use of this information assumes all liability arising from such use.

July 21, Authored by Bernardo A. This material provides general information only and is not intended as a substitute for x6386 professional examination and verification as to suitability and applicability. The values given in parentheses are for information only.

D does not allow for these types of preparation of the galvanized coating prior to application of powder coating.

Outgassing occurs when moisture trapped in the outer layer of the coating evaporates as the galvanized steel is heated when the powder coating is baked on. Preparing surfaces of new and partially weathered galvanized steel for powder coating is addressed in Practice D Sheet and coil surface preparation can be done in accordance with Practice D Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.


The result of outgassing is pinholing or blistering in the powder coating.

D gives guidance for oven aastm for preheating. A similar DVD and guidebook for preparing galvanized coatings prior to paint application is also available. It is the responsibility of the user of this standard to establish appropriate safety and health practices and to determine the application of regulatory limitations prior to use.