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1.1 This specification covers polymer precoated steel sheet for corrugated steel pipe (CSP) which is coated after metallic coating on continuous lines by coil coating (roller coating or laminating) processes. The metallic coating is either zinc, 55% aluminum-zinc alloy, or zinc-5% aluminum-mischmetal alloy. Sheet for this purpose is furnished flat in coils, flat in cut lengths, or corrugated in cut lengths, all being protected by a mill-applied polymer coating on one or both sides.
1.2 This specification is applicable to orders in either inch-pound units (as A742) or acceptable SI units (as A742M). Inch-pound units and SI units are not necessarily equivalent. SI units are shown in brackets in the text, but they are the applicable values when the material is ordered to A742M.
1.3 The following precautionary caveat refers only to the test method portion, Section 9, of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A929/A929M Specification for Steel Sheet, Metallic-Coated by the Hot-Dip Process for Corrugated Steel Pipe
D543 Practices for Evaluating the Resistance of Plastics to Chemical Reagents
D658 Test Method for Abrasion Resistance of Organic Coatings by Air Blast Abrasive
D1005 Test Method for Measurement of Dry-Film Thickness of Organic Coatings Using Micrometers
D2794 Test Method for Resistance of Organic Coatings to the Effects of Rapid Deformation (Impact)
G22 Practice for Determining Resistance of Plastics to Bacteria
G23 Practice for Operating Light-Exposure Apparatus (Carbon-Arc Type) With and Without Water for Exposure of Nonmetallic Materials (Discontinued 2001)
G62 Test Methods for Holiday Detection in Pipeline Coatings
ICS Number Code 77.140.50 (Flat steel products and semi-products)