W. Va. Code § 47-5-2: Labeling required.

(a) Each light of safety glazing material manufactured, distributed, imported or sold for use in hazardous locations or installed in a hazardous location within this state shall be permanently labeled by such means as etching, sandblasting or firing ceramic material on the safety glazing material. The label shall identify the labeler, whether manufacturer, fabricator or installer, the thickness and type of safety glazing material, and the fact that the material meets the test requirements of American National Standards Institute Standard Z- 97.1-1966 and any further requirements as may be adopted by the department of labor. The label must be legible and visible after installation.

(b) Safety glazing labeling shall not be used on other than safety glazing materials.