Gap Filler 3500S35 (Two-Part)
Thermally Conductive Liquid Gap Filling Material
Features and Benefits
• Thermal Conductivity: 3.6 W/m-K
• Thixotropic nature makes it easy to
dispense
• Two-part formulation for easy storage
• Ultra-conforming - designed for fragile and
low stress applications
• Ambient or accelerated cure schedules
TYPICAL PROPERTIES OF GAP FILLER 3500S35
PROPERTY
Color / Part A
Color / Part B
Viscosity as Mixed (cps) (1)
Density (g/cc)
Mix Ratio
Shelf Life @ 25°C (months)
PROPERTY AS CURED
Color
Hardness (Shore 00) (2)
Continuous Use Temp (°F) / (°C)
ELECTRICAL AS CURED
Dielectric Strength (V/mil)
Dielectric Constant (1000 Hz)
Volume Resistivity (Ohm-meter)
Flame Rating
THERMAL AS CURED
Thermal Conductivity (W/m-K)
IMPERIAL VALUE
White
Blue
150,000
3.0
1:1
5
Blue
35
-76 to 392
275
8.0
10
9
METRIC VALUE
White
Blue
150,000
3.0
1:1
5
Blue
35
-60 to 200
275
8.0
10
9
TEST METHOD
Visual
Visual
ASTM D2196
ASTM D792
—
—
Visual
ASTM D2240
—
ASTM D149
ASTM D150
ASTM D257
U.L. 94
ASTM D5470
—
—
—
V-O
3.6
60
15
30
V-O
3.6
60
15
30
Gap Filler 3500S35 is the technology leader
in thermally conductive, liquid gap filling mate-
rials, featuring ultra-high thermal performance
and superior softness.The material is two-
component, cured either at room or elevated
temperature. Prior to curing, the material
maintains good thixotropic characteristics as
well as low viscosity.The result is a gel-like
liquid material designed to fill air gaps and
voids yet flow when acted upon by an
external force (e.g. dispensing or assembly
process).The material is an excellent solution
for interfacing fragile components with high
topography and/or stack-up tolerances to a
universal heat sink or housing. Once cured, it
remains a low modulus elastomer designed
to assist in relieving CTE stresses during ther-
mal cycling yet maintain enough modulus to
prevent pump-out from the interface. Gap
Filler 3500S35 will lightly adhere to surfaces,
thus improving surface area contact. Gap
Filler 3500S35 is not designed to be a
structural adhesive.
Thickness vs.Thermal Resistance
Gap Filler 3500S35
0.25
CURE SCHEDULE
Pot Life @ 25°C (min) (3)
Cure @ 25°C (hrs) (4)
Cure @ 100°C (min) (4)
1) Brookfield RV, Heli-Path, Spindle TF @ 20 rpm, 25°C.
2) Thirty second delay value Shore 00 hardness scale.
3) Time for viscosity to double.
4) Cure schedule (rheometer - time to read 90% cure)
Typical Applications Include:
• Automotive electronics
• Discrete components to housing
• PCBA to housing
• Fiber optic telecommunications equipment
Configurations Available:
• Supplied in cartridge or kit form
Building a Part Number
Standard Options
6G = 6
gallon
Thickness (inch)
0.20
0.15
0.10
0.05
0.00
0.0
0.5
1.0
1.5
2.0
2
2.5
3.0
Thermal Resistance (C-in /W)
Gap Pad
®
: U.S. Patent 5,679,457 and others
All statements, technical information and recommendations herein are based on tests we believe to be reliable, and
THE FOLLOWING IS MADE IN LIEU OF ALL WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING THE IMPLIED
WARRANTIES OF MARKETABILITY AND FITNESS FOR PURPOSE. Sellers’ and manufacturers’ only obligation shall be to
replace such quantity of the product proved to be defective. Before using, user shall determine the suitability of the product
for its intended use, and the user assumes all risks and liability whatsoever in connection therewith. NEITHER SELLER NOR
MANUFACTURER SHALL BE LIABLE EITHER IN TORT OR IN CONTRACT FOR ANY LOSS OR DAMAGE, DIRECT,
INCIDENTAL, OR CONSEQUENTIAL, INCLUDING LOSS OF PROFITS OR REVENUE ARISING OUT OF THE USE OR
THE INABILITY TO USE A PRODUCT. No statement, purchase order or recommendations by seller or purchaser not
contained herein shall have any force or effect unless in an agreement signed by the officers of the seller and manufacturer.
PDS_GF_3500S35_12.08
www.bergquistcompany.com
The Bergquist Company -
North American Headquarters
18930 West 78th Street
Chanhassen, MN 55317
Phone: 800-347-4572
Fax: 952-835-0430
The Bergquist Company -
European Headquarters
Bramenberg 9a, 3755 BT Eemnes
Netherlands
Phone: 31-35-5380684
Fax: 31-35-5380295
The Bergquist Company - Asia
Room 15, 8/F Wah Wai Industrial Centre
No. 38-40, Au Pui Wan Street
Fotan, Shatin, N.T. Hong Kong
Ph: 852.2690.9296
Fax: 852.2690.2344
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