Hernon Dissipator 746 TDS

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.

Typical Applications

Typical applications include bonding transformers, transistors and other heat generating electronic components to printed circuit board assemblies or heat sinks.

Typical Properties (Uncured)

Property Value

Chemical type Modified acrylic

Appearance White paste

Viscosity at 77ºF (25ºC), Cp  at 2.5 rpm    500,000 to 2,000,000

at 20 rpm     300,000 to 800,000

Specific gravity 1.64

Flash point See MSDS

Typical Properties (Cured)

Physical Properties

Property Value

Coefficient of thermal expansion, ASTM D696 (K-1)    69 x 10-6

Coefficient of thermal conductivity,ASTM C 177, W/(m·K)  0.76

Tensile Strength at break, ISO 527, N/mm² (psi)  12.8 (1,860)

Elongation at break, ISO 527, %   0.92

Young’s Modulus, N/mm² (psi) 2,760 (400,000)

Temperature Range, ºC (ºF) -55 to 150 (-65 to 300)

Electrical Properties

Property Value

Dielectric Strength, IEC 60243-1, kV/mm  26.7

Dielectric Constant   IEC 60250 @ 100 Hz  6.49

1kHz    5.87

1 MHz  5.23

Dissipation Factor  IEC 60250  @ 100 Hz  0.10

1 kHz   0.04

10 kHz  0.03

Volume Resistivity, Ω·cm, IEC 60093   1.3 × 1012

Surface Resistivity, Ω, IEC 60093      5.1 × 1013

Typical Curing Performance

Dissipator 746, when used with Hernon EFActivator 63, fixtures at room temperature in less than five minutes.

Typical Cured Performance

Cured for 24 hours @ 22ºC.

Steel lap-shear specimens (EF Activator 63 applied to one surface), Shear Strength, ISO 4587

Property Value    Shear Strength, N/mm² (psi) ≥ 6.9 (≥ 1000)

Typical Environmental Resistance

Cured for 72 hours @ 22ºC.

steel lap-shear specimens (EF Activator 63 applied to one surface), Shear Strength, ISO 4587

Chemical/Solvent Resistance

Aged under conditions indicated for 720 hours and  tested at 22ºC.

Chemical/Solvent Temp (ºC) % of Initial Strength

Air              87          140

Water           87           75

Freon TF         87          85

Thermal Cycle Resistance

Bonded aluminum to epoxyglass lapshears cured 72hours using EF Activator 63 on 1 side were subjected to thermal cycling of 15ºC to 100ºC with a ramp time of 30 minutes. No loss in strength occurred after 1,000 hours of cycle time.

General Information

For safe handling information on this product, consult the Material Safety Data Sheet (MSDS).

Directions for use

1. For best performance bond surfaces should be clean and free from grease.

2. Use applicator to apply the activator to the surface to be bonded.

3. After the solvent evaporates, the active ingredients will appear wet, and will remain active for up to 2 hours after application. Contamination of the surface before bonding should be prevented.

4. Apply adhesive to the unactivated surface.

5. Secure the assembly, and wait for the adhesive to fixture (approximately 5 minutes) before any further handling. Full cure occurs in 4 to 12 hours.

6. The amount of adhesive applied to the part or heat sink should be limited to the amount necessary to fill the bond and just enough to give a small fillet.

7. The dispensing or application of the adhesive should be done as to minimize air entrapment within the bondline.

Device Removal/Repair

Components or devices with this thermally conductive adhesive can be removed while hot using heat from a hot air jet. Bond strength decreases at approximately 65ºC to 93ºC allowing components to be removed with lower shear forces. Method of removal/repair should be specifically determined due to the variety of components or devices bonding behavior.

Storage

Dissipator 746 should be stored in a cool, dry location in unopened containers at a temperature between 46ºF to 82ºF (8ºC to 28ºC) unless otherwise labeled. Optimal storage is at the lower half of this temperature range. To prevent contamination of unused material, do not return any material to its original container.

Dispensing Equipment

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 to determine whether the product is of satisfactory quality and suitability for their operations, and the user assumes all risk and liability whatsoever, in connection therewith. Hernon’s Quality Management System for the design and manufacture of high performance adhesives and sealants is registered to the ISO 9001 Quality Standard.

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