EPO-TEK® 353ND Black High Temperature Optical Epoxy, Heat Cure (4g Packet)

EPO-TEK® 353ND Black is a high-performance, two-part heat-cure epoxy engineered for applications requiring both exceptional thermal stability and optical opacity. Based on the proven EPO-TEK® 353ND platform, this black-pigmented formulation is designed for semiconductor, fiber optic, photonics, hybrid microelectronics, and medical device applications where suppression of visible and infrared light is critical.

The opaque black formulation minimizes light transmission while maintaining the excellent adhesion, environmental resistance, and high-temperature performance that have made EPO-TEK® 353ND a trusted choice for demanding optical and electronic assemblies.

Supplied in a convenient 4-gram packet for accurate mixing and reduced waste.

Features and Benefits

Opaque Black Formulation

Designed for optical applications requiring effective blocking of visible and infrared light transmission.

High Temperature Performance

Provides excellent thermal stability and long-term reliability in demanding operating environments.

Extremely Low Optical Transmission

Offers less than 3% transmission at 1500 nm, making it ideal for light-blocking and optical isolation applications.

Proven EPO-TEK® 353ND Chemistry

Delivers the same trusted reliability, environmental resistance, and performance characteristics found in the industry-standard 353ND epoxy system.

Strong Multi-Substrate Adhesion

Bonds effectively to glass, ceramics, metals, and many engineering plastics.

Ideal for Optical Packaging

Excellent choice for optical assemblies requiring stray light suppression, sensor shielding, and optical isolation.

High-Reliability Performance

Suitable for critical applications in fiber optics, semiconductors, medical devices, and advanced photonics systems.

Technical Specifications

• Product Type: Two-Part Heat Cure Epoxy

• Package Size: 4 g Packet

• Color: Black

• Consistency: Pourable Liquid

• Viscosity at 23°C: 3,000 to 5,000 cPs

• Glass Transition Temperature (Tg): ≥ 90°C (194°F)

• Shore D Hardness: 85

• Suggested Operating Temperature:

  • Up to 325°C Intermittent

  • Up to 617°F Intermittent

Coefficient of Thermal Expansion (CTE)

• Below Tg: 54 × 10⁻⁶ in/in/°C

• Above Tg: 206 × 10⁻⁶ in/in/°C

Optical Properties

Spectral Transmission

• Less than 3% at 1500 nm

This extremely low transmission characteristic makes EPO-TEK® 353ND Black ideal for applications requiring optical isolation and suppression of unwanted light.

Handling and Processing

• Working Life (Pot Life): Less Than 2 Hours

• Recommended Cure Schedule: 150°C (302°F) for 1 Hour

Typical Applications

Fiber Optic and Photonics Applications

• Optical component packaging

• Fiber optic component assembly

• Optical sensor packaging

• Optical isolation structures

• Stray light suppression

• Laser and photonics device assembly

• Active optical alignment systems

Semiconductor Applications

• Semiconductor packaging

• MEMS assembly

• Sensor packaging

• Electronic component bonding

Medical and Industrial Applications

• Medical device assembly

• Optical instrumentation

• Industrial sensing systems

• High-temperature electronic packaging

Why Choose EPO-TEK® 353ND Black?

EPO-TEK® 353ND Black combines the proven reliability of EPO-TEK® 353ND with a highly opaque black formulation designed for optical applications where light transmission must be minimized. It is an excellent choice for photonics, sensing, fiber optic, and semiconductor applications requiring both thermal performance and optical isolation.

Storage and Shelf Life

Store refrigerated according to the manufacturer's recommendations to maximize shelf life and maintain optimum performance.