SILIRESIN Biothan® 1750 – Tough, hard, crystal-clear casting and coating resin with over 55% renewable raw materials

Biothan® 1750 is an innovative casting and coating resin based on over 55% renewable raw materials. In combination with the hardeners Biodur® M 330 or Biodur® M330/395  , it creates a high-performance system characterized by its toughness, water resistance, and excellent UV stability .

Thanks to its special formulation, Biothan® 1750 is completely label-free, toxicologically safe, and can be processed even in humid environments or underwater. With its crystal-clear appearance and high tear resistance, it is ideally suited for thin-film encapsulation of LEDs, transparent coatings, or as an electrical casting resin and adhesive.

The system offers a very good ratio of processing to demolding time and allows for precise adjustment of hardness by varying the mixing ratio. This makes it the ideal choice for demanding applications in the electrical and electronics industries.

Product properties

• Over 55% renewable raw materials – environmentally friendly and sustainable
• Absolutely label-free and toxicologically harmless
• Crystal clear, UV-stable and moisture-resistant
• Tough, hard, highly transparent hardening
• Suitable for vacuum applications, low shrinkage < 0.1%
• Adjustable hardness (Shore D 40–75) through mixing ratio
• High tensile strength: approx. 98 N/mm²
• Temperature resistant up to > 140 °C
• Mixed viscosity: 1,800–2,500 mPa·s (23 °C)
• Shelf life: 12 months in the original container at 15–30 °C

Suitable materials

• Metals
• Glass
• plastics
• Electronic components (e.g. LEDs, sensors)

Typical application areas

• Thin-film encapsulation of LEDs and electronic components
• Production of crystal-clear, tough-hard molded parts up to 20 mm wall thickness
• Coatings, even in humid environments or underwater
• Electrical casting resin for insulation
• Universal adhesive for various materials

Processing instructions

• Mixing ratio resin : hardener: 1.2 : 1 to 1 : 1.2 possible
• Processing time: 50–60 minutes (depending on volume)
• Demolding time: 180 minutes
• Ready for use after 8 hours (accelerated at 80 °C)
• Weigh out the hardener first, then the resin and mix under vacuum
• Stir the resin component before use after prolonged storage
• For optimal results, follow the processing instructions for Biothan