Plexiglas® Optical HT

PLEXIGLAS® Optical HT is an amorphous, thermoplastic molding compound for use in all applications where a crystal clear, weathering stable acrylic material is required.

  • High level Vicat Softening temperature (118°C)
  • UL RTI – Resistance to Thermal Aging (105°C)
  • High Clarity – Suitable for Light guides > 500 mm
  • Weathering stability – UL f1 rating, AMECA
  • Good Processability – MVR comparable to standard material

Light transmittance, temperature and UV resistance
The materials used in optical components for automotive headlamps, high-power floodlights or road lighting, are usually subject to high standards. However, new trends in product design increase the thermal requirements on the materials to be used even further. For example, the use of high-performance LEDs with simultaneously smaller component depths.

Too often, increased heat deflection temperature is synonomous with loss of optical quality, even if such a loss is minimal. Not with PLEXIGLAS® Optical HT; it combines increased heat deflection temperature with excellent optical properties in one product.

Good processability and continuous service life
PLEXIGLAS® Optical HT is suitable for processing with all standard thermoplastic methods. The excellent flow properties are comparable to those of known basic molding compounds and allow the production of complex optical components.

“PLEXIGLAS® Optical HT was designed specifically for applications where high-performance LEDs are used,” emphasizes Dr. Rüdiger Carloff, Project Manager at Innovation Management Methacrylates at Röhm, who has managed the product development. “It can resist temperatures up to 105°C. This is confirmed by the RTI rating according to the UL 746B standard. It is also perfectly suitable for lighting guides with extended light paths.”

We see plenty of potential uses for PLEXIGLAS® Optical HT in the automotive industry in particular,” says Dr. Sivakumara Krishnamoorthy, Senior Product Manager Automotive in the Molding Compounds Business Unit at Röhm. “We believe that PLEXIGLAS® Optical HT provides an excellent material solution for long light guides and other demanding optical components of headlamps, which are all subject to high thermal stress.”

Dr. René Kogler, Head of Product Management for Lighting, Extrusion, Optics at Röhm adds, “We responded to the market’s demand for higher heat deflection temperature of optics to provide greater design flexibility for luminaires with PLEXIGLAS® Optical HT. 15°C increase in continuous service temperature compared to the current standard. This opens new doors in luminaire design without loss of clarity and transmittance. Customers can continue to rely on the established PLEXIGLAS® properties such as high UV and weather resistance as well as recyclability.”

Market Trend

Modern product designs demand and use

High power LED lenses

Long light guides

This leads to challenging optical and thermal requirements for materials used.

Current Issue

Numerous material solutions in the market for these applications offer:

High optical quality or High long-term service temperature

Röhm Solution

PLEXIGLAS® Optical HT offers in a single product:

High optical quality and High long-term service temperature

Applications for Plexiglas® Optical HT

Thick) lenses

Light guides

Ambient lighting

Lenses and lightguides 

Road lighting

Applications with increased heat input

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