234476 Loctite, 234476 Datasheet
234476
Manufacturer Part Number
234476
Description
3873 SELF SHIM HI COND THREM ADH
Manufacturer
Loctite
Series
LOCTITE® 3873™r
Type
Acrylic Adhesive (Activator Sold Separately)r
Datasheet
1.234476.pdf
(3 pages)
Specifications of 234476
Size / Dimension
25 ml Syringe
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
1000-103
PRODUCT DESCRIPTION
3873™ provides the following product characteristics:
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
applications include the bonding of various heat generating
devices (power devices) to thermal spreaders.
TYPICAL PROPERTIES OF UNCURED MATERIAL
TYPICAL CURING PERFORMANCE
Cure Speed vs. Substrate
Technology
Chemical Type
Appearance (uncured)
Components
Viscosity
Cure
Application
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.
one surface)
Specific Gravity @ 25 °C
Flash Point - See MSDS
Viscosity, Brookfield - HBT, 25 °C, mPa·s (cP):
Spindle TB, speed 0.5 rpm
Spindle TB, speed 5.0 rpm
150
125
100
75
50
25
1min 5min 10min 30min 1h
0
of
solid
Acrylic
Acrylic ester
Light grey opaque thixotropic fluid
with no visible bubbles
One component - requires no mixing
High
Activator
Bonding
glass
(Activator 7387™ applied to
spheres.
750,000 to 2,000,000
200,000 to 600,000
3h 6h
Recommended
LMS
24h
LMS
2.08
LMS
72h
TYPICAL PROPERTIES OF CURED MATERIAL
TYPICAL PERFORMANCE OF CURED MATERIAL
TYPICAL ENVIRONMENTAL RESISTANCE
Hot Strength
Tested at temperature
Cured for 24 hours @ 70 °C, followed by 2 days @ RT
Cured for 24 hours @ 70 °C, followed by 7 days @ RT
Cured @ RT
After 1 week @ 85 °C / 85% RH
After 7 days @ 22 °C, Activator 7387™ on 2 sides
After 24 hours @ 22 °C, Activator 7387™ on 1 side
Cured for 1 week @ 22 °C, Activator 7387™ on 2 sides
Physical Properties:
Physical Properties:
Electrical Properties:
Electrical Properties:
Lap Shear Strength, ISO 4587:
Lap Shear Strength, ISO 4587:
Lap Shear Strength, ISO 4587:
Coefficient of Thermal Expansion,
Glass Transition Temperature, °C
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
Young's Modulus
Volume Resistivity, IEC 60093, Ω·cm
Surface Resistivity, IEC 60093, Ω
Dielectric Breakdown Strength,
IEC 60243-1, kV/mm
Volume Resistivity, IEC 60093, Ω·cm
Surface Resistivity, IEC 60093, Ω
Dielectric Breakdown Strength,
IEC 60243-1, kV/mm
Steel
Aluminum
Steel
Steel:
Aluminum:
ISO 11359-2, K
@ 50 °C
@ 100 °C
@ 125 °C
@ 50 °C
-1
Technical Data Sheet
N/mm² 9.7
(psi)
N/mm² 850
(psi)
N/mm² 14.7
(psi)
N/mm² 9.5
(psi)
N/mm² ≥11.7
(psi)
3873™
N/mm² 14.7
(psi)
N/mm² 8
(psi)
N/mm² 5.6
(psi)
N/mm² 11.8
March-2008
(1,400)
(123,250)
(2,130)
(1,380)
(≥1,696)
76×10
49
1.25
72
3.2
4.3×10
3.8×10
23.62
1.5×10
2.6×10
3.54
(2,130)
(1,160)
(815)
LMS
-6
14
14
14
13
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234476 Summary of contents
Page 1
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 Components One component - requires no mixing Viscosity High Cure Activator Application Bonding 3873™ is ...
Page 2
... N/mm² 4.2 ambient conditions). (psi) (610) Loctite Material Specification LMS dated May-22, 1998. Test reports for each batch are N/mm² 8 available for the indicated properties. LMS test reports include (psi) (1,160) selected QC test parameters considered appropriate to N/mm² ...
Page 3
Trademark usage Except as otherwise noted, all trademarks in this document are trademarks of Henkel Corporation in the U.S. and ® elsewhere. denotes a trademark registered in the U.S. Patent and Trademark Office. Reference 0.3 Henkel Americas +949.789.2500 For the ...