Three changes are included in this ballot: (1) Abrasion test - Method 2 added, (2) Acceptance criteria clarified, (3) Lens impact scope defined as…. for glass lenses only. Sections changed in this document are: 4.3, 4.4, 5.4, 5.6, 5.7, 5.8, 5.9, 5.14, 5.15 and 5.16.
Previous versions of the abrasion test in SAE J575 was for use on plaques with coatings, but not for lamp lenses. FMVSS abrasion test is written for only lamp assemblies. In this ballot the FMVSS lamp lens type test is added as Method 2 (4.4.3). With this change, J575 will provide a method to abrasion test a lens material/coating combination before use on a product and a method to test a lamp lens on a finished product.
Previous acceptance criteria for thermal (5.6, 5.7, 5.8, 5.9), corrosion (5.14) and chemical resistance (5.15, 5.16) tests required one of two conditions be met. Previous wording - shall either: (a) not vary more than ±20% from the corresponding values measured before the test, or (b) meet the photometric requirements for the lamp. These ambivalent acceptance criteria are eliminated by aligning with the FMVSS 108 requirement of must “meet the photometric requirements for each function contained in the lamp”.
A study was done regarding the relevance of the lens impact test with plastic lenses. It was shown that more than 30 times the impact force of the lens impact test is required to crack a polycarbonate or PMMA headlamp lens. In review of the test history, it was determined that the required force was designed around the impact strength of a glass lens. The title of the test will be changed to apply only to glass lenses (4.3).