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Dissipator® 746

Product catalog summary

Product Description
Hernon® Dissipator® 746 is a thermally conductive adhesive designed for bonding electrical components to heat sinks or printed circuit boards. It offers fast room temperature curing, excellent heat dissipation, and controlled strength, making it a suitable replacement for tapes, epoxies, silicones, fasteners, and mechanical clips.

Typical Applications
This adhesive is typically used for bonding transformers, transistors, and other heat-generating electronic components to printed circuit board assemblies or heat sinks.

Typical Properties (Uncured)

Chemical Type: Modified acrylic
Appearance: White paste
Viscosity at 77ºF (25ºC): 500,000 to 1,000,000 cP at 2.5 rpm; 300,000 to 800,000 cP at 5 rpm
Specific Gravity: 1.64

Typical Properties (Cured)

Coefficient of Thermal Expansion: 50 x 10^-6 K^-1
Coefficient of Thermal Conductivity: 0.92 W/(m·K)
Temperature Range: -55 to 150 ºC (-65 to 300 ºF)
Dielectric Constant: 1.34 at 100 Hz, 1.31 at 10 kHz
Dissipation Factor: 0.047 at 100 Hz, 0.003 at 10 kHz

Typical Curing Performance
When used with Hernon® Activator 63, Dissipator® 746 fixtures at room temperature in less than five minutes.

Typical Cured Performance
Cured for 24 hours at 22ºC, the adhesive shows varying shear strengths depending on the substrate and curing time, with strengths reaching up to 15.1 N/mm² (2200 psi) for steel after 72 hours.

Environmental Resistance
The adhesive maintains a significant percentage of its initial strength after exposure to air and water at 87ºC for 720 hours.

Directions for Use

Ensure bond surfaces are clean and grease-free.
Apply activator to the surface to be bonded.
After solvent evaporation, apply adhesive to the unactivated surface.
Secure assembly and allow adhesive to fixture before handling.
Full cure occurs in 4 to 12 hours.

Device Removal/Repair
Components bonded with this adhesive can be removed using heat, as bond strength decreases between 65ºC to 93ºC.

Storage
Store in a cool, dry location between 45ºF to 85ºF (7ºC to 29ºC). Avoid contamination by not returning unused material to the original container.

Disclaimer
Hernon Manufacturing, Inc. provides this information based on reliable data but does not guarantee accuracy. Users should conduct their own tests to ensure product suitability for their operations.

Catalog excerpts

121 Tech Drive Sanford, FL 32771 (407) 322-4000 Fax: (407) 321-9700 www.hernon.com ISO 9001 Registered High Performance Adhesives and Sealants Technical Data Sheet Dissipator 746 Product Description Hernon Dissipator 746 is a thermally conductive adhesive formulated for bonding electrical components to heat sinks or printed circuit boards. Fast room temperature cure combined with excellent heat dissipation for thermally sensitive components and controlled strength for service repair provide perfect replacement for tapes, epoxies, silicones, fasteners and mechanical clips. Area: 1 sq. in. Stainless Steel electrodes 746 cured @ 2.0 mm thick 746 uncured @ 2.0 mm thick 746 cured @ 0.4 mm thick 746 uncured @ 0.4 mm thick Typical Applications Typical Curing Performance Typical applications include bonding transformers, transistors and other heat generating electronic components to printed circuit board assemblies or heat sinks. Dissipator 746, when used with Hernon Activator 63, fixtures at room temperature in less than five minutes. Typical Cured Performance Typical Properties (Uncured) Property Chemical type Modified acrylic White paste Specific gravity Flash point Cured for 24 hours @ 22ºC. Lap-shear specimens (Activator 63 applied to one surface), Shear Strength, ASTM D1002 Substrates Typical Properties (Cured) Physical Properties Typical Environmental Resistance Coefficient of thermal expansion, ASTM D696 (K-1) Coefficient of thermal conductivity, ASTM C 177, W/(m·K) Electrical Properties Property Impedence Measurements Specimens cured at 10:1 weight ratio with activator 15. Mixed quickly for a few minutes and cured under compression for 24 hours at room temperature. The results are as follows: Cured for 72 hours @ 22ºC. steel lap-shear specimens (Activator 63 applied to one surface), Shear Strength, ASTM D1002. Chemical/Solvent Resistance Aged under conditions indicated for 720 hours and tested at 22ºC. Chemical/Solvent Hot Strength Cured for 24 Hours at RT with Activator 63. Shear strength was determined for g

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Hernon Technical Data Sheet Dissipator 746 Hernon offers a complete line of semi and fully automated dispensing equipment. Contact Hernon Sales for additional information. These suggestions and data are based on information we believe to be reliable and accurate, but no guarantee of their accuracy is made. HERNON MANUFACTURING, INC. shall not be liable for any damage, loss or injury, direct or consequential arising out of the use or the inability to use the product. In every case, we urge and recommend that purchasers, before using any product in full scale production, make their own tests...

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