Michael D. Kane
Vice President, Quality Assurance
Bridgestone Americas Holding, Inc.
535 Marriott Drive
Nashville, TN  37214

Dear Mr. Kane:

This responds to your question whether laser etching of the tire identification number (TIN) date code is permitted by the tire marking and tire labeling requirements of Federal Motor Vehicle Safety Standard (FMVSS) No. 139 and 49 CFR § 574.5, respectively, that go into effect on September 1, 2004. You raised these questions in an April 29, 2003 meeting with us and in a letter of the same date. As explained below, the answer to your question is "yes."

Beginning September 1, 2004, paragraph S5.5 of FMVSS No. 139, "Tire Markings," requiress that each tire must be "marked" with certain information and that "the tire identification and DOT symbol labeling must comply with part 574" of 49 CFR. With respect to the TIN in particular, S5.5.1 of FMVSS No. 139 requires that "each tire must be labeled with the tire identification number required by 49 CFR part 574 on the intended outboard side of the tire."  Part 574.5 requires that "each tire manufacturer shall conspicuously label…by permanently molding into or onto the sidewall, in the manner and location specified in Figure 1, a tire identification number containing the information set forth in paragraphs (a) through (d) of this section." The TIN contains the manufacturer’s identification code, the tire size, an optional manufacturer code, and a 4-digit date code representing the week and year of manufacturer. In comments on the Tire Safety Information rulemaking, the Rubber Manufacturers Association (RMA) had stated that, under the new labeling requirements, molding the date code portion of the TIN on the intended outboard side of the tire would make it necessary for technicians to change the date code plate in the upper half of the tire mold on a weekly basis.

You state that Bridgestone/Firestone has been exploring the possibility of using laser technology as a means of etching the tire identification number into the tire sidewall. This process would involve a diode pumped, solid state laser beam that etches tire letters or numerals into the rubber with the required character heights and to the required character depths. You state that this technology would avoid the risk that would otherwise result from technicians’ having to make the weekly date code change in the top half of the tire mold. That risk has been the weekly date code change in the top half of the tire mold. That risk has been a safety concern to the tire industry. You also state that the laser etched characters, while "not ‘molded,’" are permanent and that the characters are sharp, easy to read, and conform to the letter styles specified in Notes to Figure 1 of § 574.5. Finally, you note that paragraph S5.5 of FMVSS No. 139 states that the tire must be "marked" with certain information, instead of "permanently molded." The latter is the language in paragraph 4.3 of FMVSS No. 109, the standard that has been largely superseded by FMVSS No. 139

As a general matter, the term "molding" does not include laser etching. However, in the context of the situation you describe, we would consider permanent laser etching of the date code portion of the TIN to be a satisfactory method of complying with paragraph S5.5 of FMVSS No. 139, so long as it occurred in-line, i.e., as part of the manufacturing process of the tire. In responding to petitions for reconsideration, we will amend the regulatory text to make it clear that this is permissible.

If you have any questions or need additional information, feel free to contact Nancy Bell of my staff at (202) 366-2992.

Sincerely,

Jacqueline Glassman
Chief Counsel

ref:109
d.5/30/03