This specification covers the performance requirements of an exterior lighting structural adhesive used to bond and seal the lens to housing.

Material Description.

The structural adhesive must be thermosetting (reactive hot melt, moisture-cure urethane, two-part urethane, two-part silicone, etc.) The material shall not cause crazing of acrylic or polycarbonate.

Additional mechanical retention (metal clips, plastic snap-in fasteners, fixtures, etc.) shall be used to retain the part in position during cure.

The material must be capable of being dispensed with current production equipment. It shall be compatible with production systems.

There are two classes of adhesive systems. Class I and Class II, which are based on application performance requirements and are not interchangeable. If no class designation or type designation is specified, Class I adhesive system applies as the default standard for exterior lighting.

• Class I. Structural adhesives primarily used to bond a lens and housing of an exterior lamp assembly. These materials may also be used for other suitable exterior lighting applications.
• Class II. Structural adhesives, typical two part silicone, for high-temperature applications (over 125 °C) and/or applications that do not exceed a bond joint greater than linear length of 500 mm (e.g., small Daytime Running Lamps).

Symbols. Not applicable.

Applicability. This material is used to bond/seal lighting assembly lenses to housings.

Remarks. Not applicable.