Technical Data Sheet
3873™
March-2008
PRODUCT DESCRIPTION
3873™ provides the following product characteristics:
Technology
Acrylic
Chemical Type
Acrylic ester
Appearance (uncured) Light grey opaque thixotropic fluid
with no visible bubbles
LMS
Components
One component - requires no mixing
Viscosity
High
Cure
Activator
Application
Bonding
3873™ is a self-shimming, thermally conductive adhesive.
When used with Activator 7387™, it cures rapidly to
form a high strength, high modulus, thermoset acrylic polymer.
A uniform bondline thickness of 0.127mm results from the
incorporation of solid glass spheres. Recommended
applications include the bonding of various heat generating
devices (power devices) to thermal spreaders.
TYPICAL PROPERTIES OF UNCURED MATERIAL
Specific Gravity @ 25 °C
2.08
Flash Point - See MSDS
Viscosity, Brookfield - HBT, 25 °C, mPa·s (cP):
Spindle TB, speed 0.5 rpm
750,000 to 2,000,000
LMS
Spindle TB, speed 5.0 rpm
200,000 to 600,000
LMS
TYPICAL PROPERTIES OF CURED MATERIAL
Cured for 24 hours @ 70 °C, followed by 2 days @ RT
Physical Properties:
Coefficient of Thermal Expansion,
76×10
-6
-1
ISO 11359-2, K
Glass Transition Temperature, °C
49
Cured for 24 hours @ 70 °C, followed by 7 days @ RT
Physical Properties:
Coefficient of Thermal Conductivity, ISO 8302,
W/(m·K)
Shore Hardness, ISO 868, Durometer D
Elongation, at break, ISO 527-3, %
Tensile Strength, at break, ISO 527-3
N/mm²
(psi)
Young's Modulus
N/mm²
(psi)
Cured @ RT
Electrical Properties:
Volume Resistivity, IEC 60093, Ω·cm
Surface Resistivity, IEC 60093, Ω
Dielectric Breakdown Strength,
IEC 60243-1, kV/mm
After 1 week @ 85 °C / 85% RH
Electrical Properties:
Volume Resistivity, IEC 60093, Ω·cm
Surface Resistivity, IEC 60093, Ω
Dielectric Breakdown Strength,
IEC 60243-1, kV/mm
1.25
72
3.2
9.7
(1,400)
850
(123,250)
4.3×10
14
3.8×10
14
23.62
1.5×10
14
2.6×10
13
3.54
TYPICAL CURING PERFORMANCE
Cure Speed vs. Substrate
The rate of cure will depend on the substrate used. The graph
below shows the shear strength developed with time on grit
blasted steel lap shears compared to different materials and
tested according to ISO 4587. (Activator 7387™ applied to
one surface)
TYPICAL PERFORMANCE OF CURED MATERIAL
After 7 days @ 22 °C, Activator 7387™ on 2 sides
Lap Shear Strength, ISO 4587:
Steel
N/mm²
(psi)
Aluminum
N/mm²
(psi)
14.7
(2,130)
9.5
(1,380)
% of Full Strength on Steel
150
125
100
75
50
25
0
1min 5min 10min 30min 1h
3h 6h
24h
72h
l
Stee
Aluminum
After 24 hours @ 22 °C, Activator 7387™ on 1 side
Lap Shear Strength, ISO 4587:
Steel
N/mm² ≥11.7
LMS
(psi)
(≥1,696)
glass
to epoxy
luminum
A
TYPICAL ENVIRONMENTAL RESISTANCE
Cured for 1 week @ 22 °C, Activator 7387™ on 2 sides
Hot Strength
Tested at temperature
Lap Shear Strength, ISO 4587:
Steel:
@ 50 °C
@ 100 °C
@ 125 °C
Aluminum:
@ 50 °C
N/mm²
(psi)
N/mm²
(psi)
N/mm²
(psi)
14.7
(2,130)
8
(1,160)
5.6
(815)
Cure Time
N/mm² 11.8
TDS 3873™, March-2008
@ 100 °C
@ 125 °C
Aluminum to G-10 Epoxyglass:
@ 50 °C
@ 100 °C
@ 125 °C
(psi)
N/mm²
(psi)
N/mm²
(psi)
N/mm²
(psi)
N/mm²
(psi)
N/mm²
(psi)
(1,720)
6.5
(940)
4.2
(610)
8
(1,160)
6.2
(900)
2.6
(380)
6. Product should be allowed to develop full strength before
subjecting to any service loads (typically 24 to 72 hours
after assembly, depending on bond gap, materials and
ambient conditions).
Loctite Material Specification
LMS
LMS dated May-22, 1998. Test reports for each batch are
available for the indicated properties. LMS test reports include
selected QC test parameters considered appropriate to
specifications for customer use. Additionally, comprehensive
controls are in place to assure product quality and
consistency. Special customer specification requirements may
be coordinated through Henkel Quality.
Storage
Store product in the unopened container in a dry location.
Storage information may be indicated on the product container
labeling.
Optimal Storage: 2 °C to 8 °C. Storage below 2 °C or
greater than 8 °C can adversely affect product properties.
Material removed from containers may be contaminated during
use. Do not return product to the original container. Henkel
Corporation cannot assume responsibility for product which
has been contaminated or stored under conditions other than
those previously indicated. If additional information is required,
please contact your local Technical Service Center or
Customer Service Representative.
Conversions
(°C x 1.8) + 32 = °F
kV/mm x 25.4 = V/mil
mm / 25.4 = inches
µm / 25.4 = mil
N x 0.225 = lb
N/mm x 5.71 = lb/in
N/mm² x 145 = psi
MPa x 145 = psi
N·m x 8.851 = lb·in
N·m x 0.738 = lb·ft
N·mm x 0.142 = oz·in
mPa·s = cP
Note
The data contained herein are furnished for information only
and are believed to be reliable. We cannot assume
responsibility for the results obtained by others over whose
methods we have no control. It is the user's responsibility to
determine suitability for the user's purpose of any production
methods mentioned herein and to adopt such precautions as
may be advisable for the protection of property and of persons
against any hazards that may be involved in the handling and
use thereof. In light of the foregoing,
Henkel Corporation
specifically disclaims all warranties expressed or implied,
including warranties of merchantability or fitness for a
particular purpose, arising from sale or use of Henkel
Corporation’s products. Henkel Corporation specifically
disclaims any liability for consequential or incidental
damages of any kind, including lost profits.
The discussion
herein of various processes or compositions is not to be
interpreted as representation that they are free from
domination of patents owned by others or as a license under
any Henkel Corporation patents that may cover such
processes or compositions. We recommend that each
prospective user test his proposed application before repetitive
use, using this data as a guide. This product may be covered
by one or more United States or foreign patents or patent
applications.
Heat Aging
Aged at temperature indicated and tested @ 22 °C
175
°C
% Initial strength, at RT
150
125
100
75
50
25
0
0
100
120 °C
100 200 300 400 500 600 700 800 900 1000
Exposure Time, hours
GENERAL INFORMATION
For safe handling information on this product, consult the
Material Safety Data Sheet (MSDS).
Where aqueous washing systems are used to clean the
surfaces before bonding, it is important to check for
compatibility of the washing solution with the adhesive. In
some cases these aqueous washes can affect the cure and
performance of the adhesive.
This product is not normally recommended for use on plastics
(particularly thermoplastic materials where stress cracking of
the plastic could result). Users are recommended to confirm
compatibility of the product with such substrates.
Directions for use
1. For best performance bond surfaces should be clean and
free from grease.
2. To ensure a fast and reliable cure, Activator 7387™
should be applied to one of the bond surfaces and the
adhesive to the other surface. Parts should be assembled
within 15 minutes.
3. The recommended bondline gap is 0.1 mm. Where bond
gaps are large (up to a maximum of 0.5 mm), or faster
cure speed is required, Activator 7387™ should be
applied to both surfaces. Parts should be assembled
immediately (within 1 minute).
4. Excess adhesive can be wiped away with organic solvent.
5. Bond should be held clamped until adhesive has fixtured.
Henkel Americas
+949.789.2500
Henkel Europe
+44.1442.278.000
Henkel Asia Pacific
+86.21.2891.8000
For the most direct access to local sales and technical support visit: www.henkel.com/electronics
Power technology
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