Automotive projection system, highlighed are typical adhesive locations in magenta.

DELO News

Events | Aug 31, 2023

Special Adhesive for Automotive Lighting

DELO offers a variety of adhesives for automotive lighting applications. DELO PHOTOBOND OB4189 is one example. It is resistant to yellowing and, with its high aspect ratio, is particularly suitable for bonding microlens arrays, such as those found in headlights and projection systems.

A crucial element of modern automotive design

These days, light is considered among the most important elements of automotive design and differentiation. Microlens arrays are a key player in these developments. They project LED light, which sits behind a very short focal length, providing sharp images and individual geometries. These systems are increasingly being used as optics in headlights and projection systems due to their low required installation depth.

Enabling precision with DELO PHOTOBOND OB4189

For increased efficiency, such microlenses are often made of optically pure polymers, in other words, adhesives. One example of these polymers is DELO PHOTOBOND OB4189. It is a particularly suitable candidate thanks to the following properties:

  • High viscosity of 75,000 mPa·s for a high aspect ratio
  • Retains its shape after dispensing
  • Resistant to yellowing after 500 hours at 140 °C
  • Temperature range of -40 °C to +120 °C
  • Compression shear strength of 30 MPa on PC, 25 MPa on PMMA
  • Curable via UV light (365 nm) and visible light (400 nm)
  • Typical exposure time for a layer thickness of 100 μm
  • Solvent-free

This all enables high-precision active alignment processes for optical components and low cycle times in automated production.

Automotive projection system, highlighed are typical adhesive locations in magenta.

Schematic representation of bonding areas for the fixation and alignment of optics in a microlens array headlamp module, adhesive colored magenta for illustration purposes. (Image: DELO)

With DELO PHOTOBOND OB4189, we added a high-viscosity and extremely yellowing-resistant product to our portfolio of temperature and humidity-resistant active alignment adhesives that is precisely tailored to the requirements of microlens arrays
Christoph Appel, Product Manager – LED (Automotive) at DELO

More information on adhesives for automotive lighting will be given as DELO comes out with more developments. There, experts will discuss how adhesives can replace soldering applications, how to precisely align optical components, and how more efficient manufacturing processes can be realized with different adhesive chemistries. You can find more exciting topics and tips on adhesive bonding from the experts at our TECH TALKS.

Do you have a specific application or are you looking for information on customized adhesive solutions? Send a non-binding project inquiry and let our adhesive professionals advise you.

About DELO

DELO is a leading provider of high-tech adhesives, offering solutions for automotive, electronics, and semiconductor industries for over 25 years. Our innovative technologies set industry standards. Companies like Bosch, Huawei, and Siemens trust DELO for superior adhesive technologies.

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