Adhesives Light the Way

Adhesives Light the Way

LED-Compatible Materials for Light Engines

14 DELO adhesives were tested and released for use in LED lighting. Ten products have received approval for direct LED contact, and an additional four were certified for indirect contact. They allow for durable, high-intensity LED modules and light engines.

The fourteen adhesives demonstrated their chemical tolerance in tests standard for the LED industry. The modules were supplied with 700 mA for six weeks, which heated them to up to +70 °C. During the subsequent intensity test, there was no decrease in brightness for the products meant for direct LED contact, and for those with indirect contact only a very slight decrease. The low-outgassing and yellowing-resistant adhesives ensure the long-term high optical quality of the LED module.

DELO predominantly uses light-curing epoxy resins for its ­LED-compatible products. Compared with silicones, they are more stable and provide a better seal. Under some circumstances, humidity can enter the LED and electronics when silicones are used, which shortens their service life. Light curing of epoxy resins and acrylates is also faster, making them more efficient to produce. Their temperature stability and flexibility means that they can withstand extreme heat, cold, and even vibrations. Their universal adhesion also allows reliable and practically invisible connections of even the most complex geometries and material combinations.

Precisely attaching a lens is an important step on the path towards a high-performance light.