NP1490 is a high-performance, two-part water-white polyurethane resin developed for applications where optical clarity, UV resistance, and durability are essential. Designed specifically for LED lighting encapsulation and clear castings, NP1490 combines excellent visual transparency with flexibility and impact resistance, making it ideal for demanding industrial and commercial environments.

Thanks to its exceptional UV stability, NP1490 water-white polyurethane resin has long-term clarity with minimal yellowing, even when exposed to continuous light sources. This makes it particularly well-suited to LED systems, optical components, light diffusers, and decorative clear castings where appearance is critical.

Water-white polyurethane resin with Outstanding Optical Performance

NP1490 cures to a water-white polyurethane resin finish with high light transmission and excellent surface quality. Its low viscosity and good air-release characteristics allow the resin to flow easily into moulds and encapsulations, reducing trapped air and delivering smooth, bubble-free results when used with appropriate degassing techniques.

The system is formulated to bond well to hard plastics and properly prepared metals, offering reliable adhesion across a wide range of substrates commonly used in lighting and electronic assemblies.

Flexible, Tough & Impact Resistant

Unlike brittle clear resins, NP1490 cures to a flexible polyurethane with a Shore A hardness of approximately 75. This flexibility provides enhanced impact resistance and vibration tolerance, helping to protect sensitive components such as LEDs and electronic assemblies from mechanical stress.

Once cured, NP1490 performs reliably across a wide operating temperature range of -40°C to +130°C (application and geometry dependent), making it suitable for both indoor and outdoor use.

Electrical & Thermal Properties

NP1490 offers excellent electrical insulation properties, including:

• High dielectric strength (~15 kV/mm)

• Very high volume resistivity (10¹⁴ Ohm·cm)

• Stable permittivity (~3.5 @ 50 Hz)

These characteristics make it an effective choice for electrical encapsulation where both clarity and insulation performance are required.

Processing & Application

NP1490 is supplied as a two-part system with a simple 1:1 mix ratio by volume (0.94:1 by weight). At 23°C, the material offers a moderate pot life of approximately 15 minutes, allowing sufficient working time for mixing, pouring, and degassing.

For best results:

• Mix and apply at a minimum temperature of 15°C

• Ensure relative humidity is below 40%

• Maintain a minimum casting thickness of 4mm
  (thinner sections may cure slowly and risk moisture-related foaming)

Vacuum degassing after mixing at a minimum of 5 mbar absolute pressure is recommended to achieve optimal optical clarity.

The system reaches a complete cure within 24 hours at 23°C, enabling efficient production cycles without compromising performance.

Key Features

• Water-white, optically clear polyurethane

• Excellent UV resistance

• Flexible and impact resistant

• Moderate pot life for controlled processing

• Good adhesion to hard plastics and prepared metals

• Contains no SVHCs

Typical Applications

• LED lighting encapsulation

• Optical and decorative clear castings

• Transparent protective coatings

• Electrical and electronic potting where clarity is required

NP1490 is a reliable solution for manufacturers seeking a high-clarity, UV-stable polyurethane resin that delivers consistent performance, durability, and professional-grade results in LED and clear casting applications.