Interpretation ID: aiam3959
Manager
Asahi Glass Company
Ltd.
1-2
Marunouchi 2-Chome.
Chiyoda-Ku
Tokyo
Japan;
Dear Mr. Ojima: Thank you for your letter of May 8, 1985, to Administrator Stee concerning the requirements of Standard No. 205, *Glazing Materials*, that apply to glass-plastic glazing. The answers to your questions are discussed below.; Your first question concerns the requirements of the boil and humidit tests that apply to glass-plastic glazing. You explained that after the boil test and the humidity test, your plastic material develops a haze. You stated that the maximum haze resulting from the boil test is approximately 45 percent and the maximum haze resulting from the humidity test is approximately 10 percent. However, after the sample had been left at room temperature for 24 hours, the plastic haze disappeared and the plastic 'completely recovered to the original condition.'; As you correctly noted, Standard No. 205 requires glass-plastic glazin to pass Test No. 3, Humidity, and Test 4, Boil Test, of the American National Standard Institute's 'Safety Code for Safety Glazing Materials for Glazing Motor Vehicles Operating on Land Highways' Z26.1-1977, January 26, 1977 as supplemented by Z26.1a, July 3, 1980, which is incorporated by reference in our standard. As explained in the preamble to the November 16, 1983, final rule setting performance requirements for glass-plastic glazing, the purpose of the humidity and boil tests is to ensure that the plastic layer of glass-plastic glazing does not delaminate when exposed to high temperatures and humidity. Since the temporary haze does not result in a permanent change in the structure of the glazing, which would occur if the glazing delaminated, we do not consider the temporary haze to be a failure of the boil or humidity tests. The glazing must, of course, comply with Test No. 17, Abrasion Resistance, as modified by Standard No. 205, which is directly meant to limit haze.; Your second question concerned whether you should mark glass-plasti glazing as 'AS1' or 'AS14'. You noted that ANSI Z26.1-1983 specifies that glass- plastic glazing should be marked 'AS1', while our standard specifies the use of 'AS14'. Standard No. 205 incorporates by reference the 1977 version of Z26.1, as supplemented by Z26.1a, July 3, 1980, and does not incorporate Z26.1-1983. Therefore, in accordance with S6.1 of Standard No. 205, you must mark glass- plastic glazing manufactured for sale in the United States with 'AS14'.; If you have any further questions, please let me know. Sincerely, Jeffrey R. Miller, Chief Counsel