Interpretation ID: nht68-1.40

DATE: 02/21/68

FROM: EDWIN L. SLAGLE -- DOT NHSB DIRECTOR MOTOR VEHICLE SAFETY PERFORMANCE SERVICE

TO: H. S. BEAGLE -- PRESIDENT ELECTRICAL TESTING LABORATORIES, INC.

TITLE: NONE

ATTACHMT: LETTER DATED 2/20/68 FROM H. S. BEAGLE OF ELECTRICAL TESTING LABORATORIES, INC. TO EDWIN L. SLAGLE OF D.O.T. NATIONAL HIGHWAY SAFETY BUREAU;

TEXT: Dear Mr. Beagle:

Thank you for your letter of February 20 in which you request clarification as to the proper test procedures to be employed in determining compliance of electrically heated automotive glazing with the requirements of Motor Vehicle Safety Standard No. 205 - Glazing Materials.

Since neither Standard No. 205 nor the USASI Standard Z26.1 - 1966, which is referenced in Standard No. 205, specifies special procedures with regard to electrically heated glass, the same procedures required for non-electrically heated glass are appropriate.

Although at present rear window defrosting and defogging are not required, I would be most pleased to review with you your experience as to the effectiveness of this type of glass in meeting requirements such as have been established under Motor Vehicle Safety Standard No. 103.

Sincerely,