NewNew ProductsProducts

Lineup Expansion of Non-Silicone Thermally Conductive Sheet“F-CO TM Sheet”

Furukawa Electric and F-CO have jointly developed andbrought into the market F-CO TM Sheet —TM standing
for Thermal Management—, which is high-performance
thermally conductive sheet completely free from low
molecular-weight siloxane. We have recently expanded
the product lineup and upgraded the performance tomeet the market needs.

1.

THERMALLY CONDUCTIVE SHEETAs components for electronic equipment of recent
date improve in performance, they tend to generate ahigher amount of heat leading to increased demand forthermally conductive sheets as a means to dissipate theheat efficiently.
Conventional thermally conductive sheets mostly usedsilicone rubber materials for their plasticity and heatresistance. These silicone rubber materials, however,
have been presenting problems such that low molecularweight siloxane contained in the material volatilizes due toincreased temperatures coming from the heat-generating
devices, and subsequently adhere to electrical contacts
in the equipment such as motors, relays and switches,
thereby producing silicon dioxide —an electrical insulator— and eventually causing defective contacts.
Accordingly, there has been an increasing demand fora siloxane-free thermally conductive sheet with equivalent
performance in terms of plasticity and heat conductivity.
In response to such a demand, we have developed andbrought into the market F-CO TM Sheet, a series of highthermally conductive sheets based not on silicone rubber
but on acrylic rubber. We have recently developed newtypes of F-CO TM Sheet with improved performance andworkability, making available many types of the thermallyconductive sheets suitable to varied applications.

2.

TYPES OF F-CO TM SHEETF-CO TM Sheet comes in various types aimed atmore efficient heat dissipation such as: high-thermal
conductivity type; upgraded type in terms of plasticity,
workability or elasticity for reducing contact heatresistance; high-insulating type; and high-adhesion type.
See Table 1.
2.1 Standard TypeThe standard type of non-silicone, thermally conductive

F-CO TM Sheet is F-CO TM Sheet EE based on acrylic
rubber. The standard thickness ranges from 0.5 mm
to 4.0 mm. The product has acquired a UL94 V-0certification.
2.2 High Thermally Conductive TypeAmong the standard F-CO TM Sheet EE series based onacrylic rubber, F-CO TM Sheet EE-R is available, which ishighly thermal conductive with a thermal conductivity of 3
W/m·K.
2.3 Elastic and Electric Insulating Type
Thermally conductive F-CO TM Sheet EP series basedon ethylene-propylene rubber is available, which is low in
hardness and is electrically insulating.
2.4 Thin Film TypeTo reduce heat resistance as much as possible to achieve
good heat conduction, it is no doubt the best way tomake the sheet as thin as possible. Thin film type F-COTM Sheet A90 consists of an aluminum foil with thermallyconductive adhesive layers on the both faces. It features,in addition to the reduced heat resistance in the thickness
direction thanks to the small thickness of 90 µm, a large
heat diffusion coefficient in the plane taking advantage ofgood thermal conductivity of the aluminum foil.
2.5 General-Purpose and Elastic TypeIn addition to the standard EE series, F-CO TM Sheet
TP series is available, which is a new general-purpose
type with low hardness and high elasticity. The TP series
is based on thermoplastic elastomer, and is provided
with rubber-like elasticity combined with good thermalconductivity.
Products with lower hardness are also available taking
advantage of the proprietary compounding technology.
2.6 Others
F-CO TM Sheet PZ with strengthened adhesion isavailable. Its adhesion is about 5 to 10 times that ofordinary PVC adhesive tapes.
Self-adhesive F-CO TM Sheet JB with good resistanceagainst low temperatures, high temperatures and chemicals is available.
F-CO TM Sheet EMI series is available, which is provided with good resistance against electromagnetic wave
interference (EMI).

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2005

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Lineup Expansion of Non-Silicone Thermally Conductive Sheet “F-CO TM Sheet”

3.

FEATURES OF F-CO TM SHEET

4.

F-CO TM Sheet has the following features in common.
(1) Stable thermal conductivity
Stable thermal conductivity is maintained for a long
period due to the proprietary compounding technology.
(2) Siloxane-freeBecause it is based on non-silicone rubber, there is nodanger of having contact faults caused by volatilization oflight molecular-weight siloxane.
(3) Halogen-free
Whereas many types of the F-CO TM Sheet is provided
with high flame retardance, all the products do not contain halogens whatever that may generate toxic gases.
Table 1CONCLUSION

We intend to promote hereafter the development ofthermally conductive sheet in response to diversified
customers' needs. We are ready to offer our development
proposals for any requirements concerning thermallyconductive sheets not covered in the description of theF-CO TM Sheet presented here. So, please feel free tocontact us.

Properties of F-CO TM Sheet.

Standard/High-thremal conductive
StandardHigh-thermalconductive

Low hardness

StandardLow hardness

Ultra-low hardness

EE

EE-R

EE-SEPEPS

SS

Min.

0.5

0.5

1.0

0.5

0.5

0.5

Max.

555555

2.5

3.0

1.5

1.5

1.5

1.5

1×10101×10101×10101×1014

1×1015

1×1015

1515Type

Thickness (mm)Elastic & Electric insulating

Thermal conductivity (W/m·K)
Volume resistivity (Ωcm)
Breakdown voltage (kV/cm)

10101015

Flame retardance (UL94)

V-0V-0V-0 equivalent

V-0

V-2 (0.5 mm~), V-0 (2.0 mm~)

Hardness (Asker C)

6560

40504030Adhesion (N/25mm)

1.50.3

0.5

0.3

0.3

1.5High adhesion

Heat and chemicalresistantThin film

EMI

General-purpose & Elastic
TypeThickness (mm)Standard

Low hardness

TPTP-SSPZ

JB

A90

EE/EMI

Min.

0.3

0.3

0.5

0.5

0.09

0.5

Max.

552—

—

52.3

2.5

1.5

0.6

0.8

1.4 in thickness>15 in plane

1×1012

1×1012

1×1014

1×1011

1×10101×1010

Breakdown voltage (kV/cm)

10103030

22Flame retardance (UL94)

V-0

V-0

V-2

V-0 equivalent—

V-0Hardness (Asker C)

50305030—60Adhesion (N/25mm)

0.3

0.5

12.0

0.5

1.40.5

Thermal conductivity (W/m·K)
Volume resistivity (Ωcm)

For more information, please contact:
Thermal and Antenna Solutions Dept., Electronics
Components Div., Electronics and Automotive Systems
Co.
TEL: +81-463-24-9784
FAX: +81-463-24-9786
orR&D Div., F-CO
TEL: +81-463-21-4873
FAX: +81-463-21-5509

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