1.1 This specification covers hot-rolled and cold-rolled steel sheet coated by the electrolytic process. Coatings can be comprised of pure metals or metal alloys. For specific coatings, refer to Specifications A879 and A918. 1.2 The product shall be coated on one or both surfaces and may have equal or differential coating masses on the two surfaces. Sheet coated with equal coating masses on each surface would have similar levels of corrosion protection on each surface. Often, however, a higher level of corrosion protection is required on one surface than is required on the other. Thus one surface may have a heavier coating mass than the other. The light coated (or uncoated) surface is typically painted to provide additional corrosion protection. 1.3 This coating process has essentially no effect on the base metal mechanical properties and can be used on any grade or quality of hot- or cold-rolled steel sheet. The coated sheet is available as commercial quality, drawing quality, drawing quality special killed, structural (physical) quality, or high-strength low-alloy steel. 1.4 The values stated in SI units are to be regarded as the standard.