Hernon Dissipator 745 Technical Data Sheet

Product Description

Hernon Dissipator 745 is a thermally conductive room temperature cure adhesive that is designed for bonding electrical components to heat sink with a controlled gap.

Dissipator 745, through a special shimming property, insulates the component electrically while allowing thermal conductivity. This special shimming feature of produces a constant gap of 0.005 in. to 0.006 in. between components.

 

Product Benefits

No mixing required (eliminates errors in mixing ratio)

Room temperature cure. No heat required

Eliminates screws and rivets for assembly

Eliminates the air space between components

High k factor for heat conductive application

 

Typical Properties (Uncured)

Property	Value
Chemical type	Modified acrylic
Appearance	Light blue paste
Viscosity at 77ºF (25ºC), cP	300,000 to 800,000
Specific gravity	1.63
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)	0.808
Tensile Strength at break, ISO 527, N/mm² (psi)	15.2 (2,200)
Elongation at break, ISO 527, %	1
Young’s Modulus, N/mm² (psi)	2,690 (390,000)
Temperature Range, ºC (ºF)	-55 to 150 (-65 to 300)

 

Electrical Properties

Property	Value
Dielectric Strength, kV/mm IEC 60243-1, kV/mm	26.7
Dielectric Constant  @                     100 HzIEC 60250                                1 kHz 1 MHz	6.175.62 4.99
Dissipation Factor  @                    100 HzIEC 60250                              1 kHz 10 kHz	0.090.04 0.03
Volume Resistivity, Ω·cm, IEC 60093	1.3 × 1012
Surface Resistivity, Ω, IEC 60093	1.2 × 1013

 

Typical Curing Performance

Dissipator 745, when used with Hernon  EF Activator 63, fixtures at room temperature in less than five minutes.

 

Typical Cured Performance

Shear Strength, ISO 4587

EF  Activator 63 applied to one surface

Cure @ 22ºC	Substrates		N/mm² (psi)
1 hour	Steel		≥ 3.4 (≥ 500)
24 hours	Steel		≥ 5.5 (≥ 800)
72 hours	Steel		6.9 (1000)
72 hours	Aluminum		5.5 (800)
72 hours	Aluminum to Epoxy glass		4.1 (600)

 

Impact Strength, ISO 4587 EF^ Activator 63 applied to one surface

Cure @ 22ºC	Substrates		N.m(lb.ft)
72 hour	Steel		6.8(5)

 

 

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 72 hours 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 24 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.

8. The successful application of this product depends on accurate dispensing on the parts to be bonded.Hernon Equipment Engineers are available to assist you in selecting and implementing the appropriate dispensing equipment for your application.

 

Storage

Dissipator 745 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.

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