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

Topics & Application Fields

Key terms related to this product. Also useful for our search and filters.

Biothan Standard Optical Resin M330 UV-Stable LED Encapsulation Coatings Transparent Optical Clear Resin Bioresin 2-Component Casting System Food-Compliant SILIRESIN Crystal Clear Biothan 1750 Range Review 2026

Technical data for SILIRESIN Biothan 1750 L

All 9 product information 6 Physical properties 1 Curing values 1 Mechanical properties 1

Product Information
Brand	SILIRESIN
Former Product Name	Biothan 2 MD 1750
Container	500 g, 1 kg, 5 kg, 20 kg, 25 kg
Viscosity (mPa.s)	1800-2200
Pot Life	50 - 60 minutes
Demolding time	180 minutes

Physical Properties
Color	transparent

Curing values
Curing speed (oven)	3 hours

Mechanical properties
Hardness (Shore D)	40-75

Please refer to the technical data sheet (TDS) in the "Documents" tab for binding values.

No public documents available.
On request, we will gladly send you TDS and SDS by email, Submit request.

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SILIRESIN Biothan 1750 L

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