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Epoxy, Grease, & Varnish
www.lakeshore.com Lake Shore Cryotronics, Inc. (614) 891-2244 fax: (614) 818-1600 e-mail: info@lakeshore.com
144 Accessories
Epoxy, Grease, & Varnish
Epoxy, Grease, & Varnish
Specications

Conductive Epoxy
Stycast
®
Epoxy
Apiezon Grease
Varnish



Type N
Type H
Max temperature
573 K
403 K
316 K
523 K
423 K
Thermal conductivity
1 K

0.0065 W/(m · K)
0.001 W/(m · K)

0.034 W/(m · K)

4.2 K

0.064 W/(m · K)
0.005 W/(m · K)

0.062 W/(m · K)
77 K




0.22 W/(m · K)
100 K


0.11 W/(m · K)

0.24 W/(m · K)
300 K
1.7 W/(m · K)
1.3 W/(m · K)
0.26 W/(m · K) 0.22 W/(m · K)
0.44 W/(m · K)
Thermal expansion (1/K)
>360 K: 150 × 10
-6

29 × 10
-6

0.00072
0.00072

<360 K: 43 × 10
-6
Volume resistivity
At 298 K:
298 K: 5 × 10
14
(
·m)
2 × 10
16

4.6 × 10
13



0.0001 to 0.0004 (
·cm)
394 K: 1 × 10
10
(
·m)
(
·m)
(
·m)

Shelf-life (298 K max)
12 months
12 months

Pot life
4 days,
45 min,


~1 day working time
~20 min working time
Cure schedule
323 K: 12 h
298 K: 16 to 24 h
NA
NA
5 min to 10 min

353 K: 90 min
318 K: 4 to 6 h,


drying time

393 K: 15 min
338 K: 1 to 2 h

423 K: 5 min

448 K: 45 s
Dielectric strength
NA
14.4 kV/mm (365 V/µm)

Dielectric constant
NA
(1 MHz): 5.01

Vapor pressure
NA
<13.3 Pa (0.1 torr)
2.67 × 10
-7
Pa 3.60 × 10
-7
Pa
Partial


at 298 K
(2 × 10
-9
torr) (2.7 × 10
-9
torr)



at 293 K
at 293 K www.lakeshore.com Lake Shore Cryotronics, Inc. (614) 891-2244 fax: (614) 818-1600 e-mail: info@lakeshore.com

Accessories
145
Epoxy, Grease, & Varnish
Epoxy
Low Temperature Conductive Epoxy
This epoxy is used to permanently attach
test samples or temperature sensors to
sample holders. It is a 100% solid, two
component, low temperature curing,
silver-lled epoxy which features very
high electrical and thermal conductivity
combined with excellent strength and
adhesive properties. Excellent low temperature
thermal and electrical
conductivity Low viscosity Thixotropic No resin bleed during curing Low weight loss Low volatility
Specications
Maximum operating temperature: 573 K (300 °C)
Thermal conductivity: 300 K (27 °C) 1.7 W/(m · K)
Thermal expansion coefficient (K
-1
)

above 360 K (85 °C)
150 × 10
-6


below 360 K (85 °C)
43 × 10
-6
Volume resistivity (
·cm) at 298 K (25 °C):

0.0001 to 0.0004
Shelf life (25 °C [298 K] max): 12 months
Pot life: 4 days, about 1 day working time
Cure schedule:

323 K (50 °C) 12 h

353 K (80 °C) 90 min

393 K (120 °C) 15 min

423 K (150 °C) 5 min

448 K (175 °C) 45 s
Stycast
®
Epoxy 2850-FT, Catalyst 9 Mixed and applied from
two-part exible packets Excellent low temperature
properties Permanent mounting Exceptional electrical grade
insulation properties Low cure shrinkage Low thermal expansion Resistance to chemicals
and solvents
Stycast® is the most commonly used,
highly versatile, nonconductive epoxy
resin system for cryogenic use. The
primary use for Stycast® is for vacuum
feedthroughs or permanent thermal
anchors. Lake Shore uses this product
in vacuum tight lead-throughs with
excellent thermal cycle reliability.
Stycast® is an alternative to Apiezon® N
grease when permanent sensor mounting
is desired. (Can place stress on sensor
see Appendix C.)
Specications
Maximum operating temperature: 403 K (130 °C)
Glass transition temperature: 359 K (86 °C)
Thermal conductivity:

1 K (272 °C) 0.0065 W/(m · K)

4.2 K (269 °C) 0.064 W/(m · K)

300 K (27 °C) 1.3 W/(m · K)
Thermal expansion coefficient (1/K): 29 × 10
-6
Volume resistivity [
·m]

298 K (25 °C) 5 × 10
14


394 K (121 °C) 1 × 10
10
Dielectric strength: 14.4 kV/mm (365 V/mil)
Dielectric constant (1 MHz): 5.01
Shelf life (25 °C [298 K] max): 12 months
Pot life: 45 minutes, about 20 minutes working time
Vapor pressure at 298 K (25 °C): <13.3 Pa (0.1 torr)
Cure schedule:
298 K (25 °C) 16 h to 24 h

318 K (45 °C) 4 h to 6 h

338 K (65 °C) 1 h to 2 h
TML: 0.25% CVCM: 0.01%
Ordering Information
Part number Description
ES-2-20
Stycast
®
epoxy, 20 packets, 2 g each
Note: Epoxy must be cured at a minimum
of 50 °C for 12 hours to achieve proper
electrical and physical properties. Curing
at 175 °C for 45 seconds will achieve
optimum properties.
Note: Can be chemically removed with
methylene-chloride (several hour soak).
A commercially available stripper is
supplied by Miller-Stephenson Co.
at phone (203) 743-4447 or
fax (203) 791-8702, part number MS-111.
Classied as a hazardous chemical by the
U.S. Government. International orders
air freight only. U.S. UPS Ground only.
Ordering Information
Part number Description
ESF-2-5
Low temperature conductive epoxy,

5 packets, 2 g each
ESF-2-10
Low temperature conductive epoxy,

10 packets, 2 g each www.lakeshore.com Lake Shore Cryotronics, Inc. (614) 891-2244 fax: (614) 818-1600 e-mail: info@lakeshore.com
146 Accessories
Epoxy, Grease, & Varnish
Grease
Apiezon
®
Grease Types N and H
Apiezon® grease is well-suited for
cryogenic use because of its low vapor
pressure and high thermal conductivity.
It is often used for nonpermanent
mounting and thermal anchoring of
cryogenic temperature sensors as well as
for lubricating joints and o-rings.
Apiezon® N: this general purpose grease
enhances thermal contact and provides
a temporary mounting method for
temperature sensors. It is pliable at
room temperatures and solidies at
cryogenic temperatures, which makes
it easy to apply and remove the sensor
(without damage) at room temperature.
The grease is not an adhesive and will not
necessarily hold a sensor or wires in
place without some mechanical aid,
such as a spring clip or tape. It is very
good for sensors inserted into holes.
Contains a high molecular weight
polymeric hydrocarbon additive which
gives it a tenacious, rubbery consistency
allowing the grease to form a cushion
between mating surfaces.
Apiezon® H: this grease will withstand
temperatures up to 523 K (250 °C)
without melting. It is designed for
general purposes where operating
temperatures necessitate the use of a
relatively high melting point grease. Stable Nonpermanent
sensor mounting Chemically inert Nontoxic Easily applied and removed Excellent lubrication
properties
Note: Can be removed using Xylene with
an isopropyl alcohol rinse.
Ordering Information
Part number
Description
GAN-25
Apiezon
®
N grease, 25 g tube
GAH-25
Apiezon
®
H grease, 25 g tube
Specications
Apiezon
®
grease
Type N
Type H
Approx. melting point: 316 K (43 °C) 523 K (250 °C)
Thermal conductivity:
293 K (20 °C)
0.19 W/(m·K) 0.22 W/(m·K)
1 K (-272 °C)
0.001 W/(m·K)
4.2 K (-269 °C)
0.005 W/(m·K)
100 K (-173 °C)
0.15 W/(m·K)
300 K (27 °C)
0.44 W/(m·K)
Volume resistivity:
2 × 10
16
·m 4.6 × 10
13
·m
Thermal expansion
coefficient (K
-1
):
0.00072
0.00072
Vapor pressure at 293 K (20 °C):

2.67 × 10
-7
Pa 3.60 × 10
-7
Pa

(2 × 10
-9
torr) (2.7 × 10
-9
torr)
Solvent system:
Hydrocarbons or

chlorinated solvents www.lakeshore.com Lake Shore Cryotronics, Inc. (614) 891-2244 fax: (614) 818-1600 e-mail: info@lakeshore.com

Accessories
147
Epoxy, Grease, & Varnish
Varnish Clear modied phenolic Can be air-dried or baked Use up to 470 K for
1 hour to 2 hour maximum Varnish will not outgas
after baking Can be used in vacuum
(1.33 × 10
-6
Pa
[9.98 × 10
-9
torr]) Superior electrical properties Excellent chemical resistance May be applied by dipping,
roller coating, brushing,
or spraying Moderately good,
low stress adhesive Enhances thermal contact
VGE-7031 Insulating Varnish and
Adhesive possesses electrical and bonding
properties which, when combined with its
chemical resistance and good saturating
properties, make it an excellent material
for cryogenic temperatures. As an
adhesive, VGE-7031 bonds a variety of
materials, has fast tack time, and may
be air-dried or baked. It is excellent for
laminating many types of materials, and
may be applied to parts to be bonded
and either baked shortly after applying
or allowed to air dry and baked after
the part