CC3-450

ALUMINUM FILLED, HEAT SINK BONDING RESIN

CC3-450 is a medium viscosity, aluminum filled, bonding resin that has gained wide-spread acceptance as the primary bonding resin used in the assembly of heat sink components and the attachment of heat sinks to sources of heat or cold. This resin system is the most widely used bonding agent in the heat sink industry with a history of many varied applications over the last thirty years. There is real industry acceptance for this product at all of the major heat sink suppliers for their bonded heat sink requirements

In the typical bonded fin heat sink the contribution of the bonded fin joint to the overall thermal resistance of the full heat sink is from 1 to 3%. The primary contribution to the thermal resistance of bonded heat sinks is the convective contribution between the air and the finned surface. The second most significant factor is the base spreading conductive resistance and the fin conductive resistance. Good joint design and clean, rough surfaces produce superior joints that generally exceed the mechanical requirements of the application while remaining an insignificant contributor to the overall thermal resistance of the bonded fin heat sink.

SUGGESTED APPLICATIONS

Fin-to Base:

High thermal conductivity at the joint. The slot depth should be three times the fin
thickness with a top chamfer of 20/25% of the slot depth. The slot width should be
fin thickness plus 0.005/0.010". For maximum bond strength, vapor blast the slot
and the fin edge followed by a proper degreasing process. Fins should be 1100H14
aluminum alloy and bases 6063T5 for maximum conductivity. This design, properly
cured, will produce a bond strength that exceeds the shear strength of the fin in a
typical tensile test.

Folded Fin
Set-To-Base:




 

High thermal conductivity for all minimum bond line joints. This is accomplished by
setting weights on the fin sets or clamping the crested ends. Fin sets are best
ordered with the flat crested ends. This insures the maximum contact area with the
base for optimum heat transfer. The fins sets should fit into a recess (.025/.035" deep)
to secure their position during cure.

Bent Wire
Pin Fin
Set to Base:

Complex shapes and very high omni-directional performance heat sinks can be
assembled from pin fin segments bonded to the base with this high thermal
conductivity filled epoxy system. The same rules of cleanliness, surface
preparation and clamping are also requiredin this application.

 

Cold Plate
Tube-To-
Extruded
Base:

The thermal joint between a cold plate and the extruded aluminum base is the
single major source of overall thermal resistance of this style of design.
Careful attention to tube design and crimping details to minimize the glue
line can make a large difference in the thermal performance of this economical
cold plate design.

 

High
Performance
Cold Plate
Tube to Base:

The glue line joint is the most important contributor in cold plate design. Therefore, it is
essential to minimize the glue line, which is accomplished by pressing the tubes into the
mechanical aluminum plates. There are two basic design types, tubes-up to face the heat
load for the very best performance and tubes-down to spread the cooling over the entire
heat sink surface. Optimum thermal conductivity is an absolute necessity for this
application.
ELECTRICAL AND PHYSICAL PROPERTIES  
  Specific Gravity: @ 25 ' C 1.79
  Viscosity: cps, uncatalyzed @ 75 ' C 6,500 - 7,000
  ___________cps, catalyzed @ 30'C 6,500 - 7,000
  Thermal Conductivity: W/m'C 4.54 - 200*
  __________________BTU/ft-hr-'F/in 31.5
  Tensile Strength: psi @ 25 ' C 8,900
  Compressive Strength: psi @ 25'C 18,500
  Bond Shear Strength: A1 to A1 1" overlap: psi @ 25 ' C 3,600
  _________________after 30 days in water: psi @ 25 ' C 2,800
  Izod Impact: ft. lbs / in of notch 0.49
  Coefficient of Thermal Expansion: in/in/'C x 10 28
  Heat Distortion: ' C 65 (149'F)
  Water Absorption: 7 days @ 25 ' C 0.1
  Linear Shrinkage: in/in 0.003
  Service Temperature: 'C, continuous -70 to 195
  Standard Color Metallic Aluminum

(Typical properties when cured with H-7)

* The thermal conductivity of CC3-450 cured with H-7 Hardener is 4.54 W/m ' C. However, the thermal conductivity of an assembled heat sink can approach the thermal conductivity of the basic metal depending upon design and construction.

CHOICE OF HARDENERS

H-1 HARDENER - rigid, good dimensional stability, fast cure.
H-7 HARDENER - resilient, excellent mechanical and thermal shock,
low viscosity, good air release, fast cure.
H-34 HARDENER - resilient, excellent mechanical and thermal shock,
plus high heat distortion, long pot life.
H-lOLV HARDENER - variable hardness, excellent impact properties, long pot life.


HARDENER
PARTS BY WEIGHT
PER 100 PARTS
OF RESIN
POT LIFE
100 GRAM
25 ' C (77 ' F)
CURE TIME
25 ' C
(77 ' F)
CURE TIME
65 ' C
(149 ' F)
CURE TIME
125 ' C
(257 ' F)
H-1
4.9
30 mins.
8 hrs.
30 mins.
15 mins.
H-7
10.4
45 mins.
16 hrs.
45 mins.
20 mins.
H-34
7.1
4 hrs.
---
16 hrs.
2 hrs.
H-10LV
rigid ________13
3 hrs.
24 hrs.
3 hrs.
---
H-10LV
semi-flex _____30
3 hrs.
24 hrs.
3 hrs.
---
H-10LV
flexible _______45
3 hrs.
24 hrs.
3 hrs.
---

ROOM TEMPERATURE CURE

H-1 HARDENER


 - Cures overnight at room temperature or 30 minutes at 65 ' C.
Do not heat cure if the mass exceeds 2 pounds.
H-7 HARDENER

 - Cures overnight at room temperature or 45 minutes at 65 ' C.
H-lOLV HARDENER - Cures overnight at room temperature or 3 hours at 65 ' C.

HEAT CURE

H-34 HARDENER - Cures over night at 65'C or 2 hours at 125'C. For the best physical and electrical properties, a slow cure for 16 hours at 65'C followed by a post cure for 2 hours at 125'C is recommended.

MIXING INSTRUCTIONS

Mix CC3-450 thoroughly in its shipping container to insure a uniform consistency. Weigh out the required amount of resin in a clean container. Add the hardener accurately by weight in the proper proportion as specified above. Mix thoroughly.

Use in a well ventilated area and avoid contact with eyes and skin.

(508) 587-4502 FAX (508) 587-4514

354 WEST STREET W. BRIDGEWATER, MA 02379

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