EPO-TEK® 353NDT Thixotropic High Temperature Black Epoxy, Heat Cure (2.5g)
EPO-TEK® 353NDT Thixotropic High Temperature Black Epoxy, Heat Cure (2.5g Packet)
EPO-TEK® 353NDT Black is a two-component, thixotropic, high-temperature epoxy adhesive designed for fiber optic, medical, PCB, and electronic packaging applications. As the black, opaque version of the industry-standard EPO-TEK 353NDT, it combines excellent thermal stability with superior light-blocking performance for optical assemblies requiring minimal visible and infrared light transmission.
Its smooth thixotropic paste consistency helps prevent adhesive flow after dispensing, making it ideal for vertical surfaces, precision bonding, and applications where controlled placement is critical. With a 3-hour working life, EPO-TEK 353NDT Black provides ample processing time for complex assembly operations while delivering strong mechanical performance and reliable high-temperature operation.
Packaged in a convenient 2.5-gram packet, this epoxy is well suited for prototype development, laboratory use, low-volume production, and field repair applications.
Features & Benefits
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Black, opaque version of the industry-standard EPO-TEK 353NDT
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Excellent visible and infrared light blocking characteristics
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Highly thixotropic, non-sag paste for precise adhesive placement
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High-temperature performance and thermal stability
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Extended 3-hour pot life for assembly flexibility
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Ideal for fiber optic, medical, and electronic packaging applications
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Smooth dispensing with minimal migration after application
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Convenient 2.5 gram packet packaging
Typical Applications
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Fiber optic component assembly
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Optical and optoelectronic packaging
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PCB assembly and electronic packaging
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Medical device manufacturing
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Sensor packaging
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Semiconductor and microelectronic assembly
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Light-blocking optical applications
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Precision bonding in confined or vertical areas
Technical Specifications
| Property | Value |
|---|---|
| Product Type | Two-Part Epoxy Adhesive |
| Color | Black |
| Cure Type | Heat Cure |
| Consistency | Smooth Thixotropic Paste |
| Pot Life | 3 Hours |
| Viscosity (23°C) | 9,000 – 15,000 cPs |
| Thixotropic Index | 3.8 |
| Glass Transition Temperature (Tg) | ≥ 90°C (194°F) |
| CTE Below Tg | 43 × 10⁻⁶ in/in/°C |
| CTE Above Tg | 231 × 10⁻⁶ in/in/°C |
| Shore D Hardness | 80 |
| Particle Size | ≤ 20 Microns |
| Suggested Operating Temperature | Up to 325°C (617°F) Intermittent |
Recommended Cure Schedule
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150°C for 1 Hour
Optical Performance
The black formulation provides excellent opacity across visible and infrared wavelengths, making it suitable for applications requiring optical isolation and stray light suppression.
| Wavelength Range | Spectral Transmission |
|---|---|
| 300 – 1460 nm | Less Than 5% |
| 1550 nm | Less Than 7% |
Markets Served
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Fiber Optics
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Optoelectronics
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Medical Devices
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PCB Assembly
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Semiconductor Manufacturing
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Electronic Packaging
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Microelectronics