1.1 This specification covers glass fiber reinforced polymer (GFRP) bars, provided in cut lengths and bent shapes and having an external surface enhancement for concrete reinforcement. Bars covered by this specification shall meet the requirements for geometric, material, mechanical, and physical properties described herein. 1.2 Bars produced according to this standard are qualified using the test methods and must meet the requirements given by Table 1. Quality control and certification of production lots of bars are completed using the test methods and must meet the requirements given in Table 2. 1.3 The text of this specification references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables) shall not be considered as requirements of the specification. 1.4 The following FRP materials are not covered by this specification: 1.4.1 Bars made of more than one load-bearing fiber type (that is, hybrid FRP). 1.4.2 Bars having no external surface enhancement (that is, plain or smooth bars, or dowels). 1.4.3 Bars with geometries other than solid, round cross sections. 1.4.4 Pre-manufactured grids and gratings made with FRP Materials. Dowels and Pre-manufactured grids made with GFRP materials are included in this specification. 1.5 This specification is applicable for either SI (as Specification D7957M) or inch-pound units (as Specification D7957). 1.6 The values stated in either inch-pound units or SI units are to be regarded as standard. Within the text, the inch-pound units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.