Research, Development & Engineering
Tallaght Business Park,
Dublin, Ireland
PRODUCT DESCRIPTION
LOCTITE
廬
Product 3880 is a silver filled, one-component,
epoxy adhesive that can be cured by heat. It combines high
tensile strength with good electrical and thermal conductivity.
The product has particularly good syringe dispensing
characteristics and can also be applied by stencil/screen
printing.
TYPICAL APPLICATIONS
Bonding of metals, ceramics and plastics as used in electronic
parts, where good adhesion combined with electrical and
thermal conductivity is required. Typical examples are bonding
of surface mount devices to flexible or rigid substrates; bonding
of semiconductor elements; joining EMI parts; bonding
electrodes, lead wires or other connectors that require
conductivity.
PROPERTIES OF UNCURED MATERIAL
Typical
Value
Chemical Type
Epoxy
Appearance
Smooth, Silver Paste
Specific Gravity @ 25擄C
2.12
Viscosity @ 25擄C, mPa.s (cP)
125,000
VOC (g/l)
177
Flash Point (TCC),
擄C
107
Technical Data Sheet
Product 3880
Worldwide Version, October 1998
TYPICAL CURING PERFORMANCE
Cure times at temperature as determined by DSC:
@125潞C
@150潞C
@175潞C
10 min.
6 min.
3 min.
The above times give an indication of the time/temperature
relation needed to cure the adhesive. Actual times needed will
be longer since various part and board configurations heat at
different rates depending on mass and types of ovens used.
The adhesive itself needs to reach the indicated temperature for
the indicated time to achieve full cure.
TYPICAL PROPERTIES OF CURED MATERIAL
Physical Properties
Coefficient of thermal expansion, ASTM D696, K
-1
(-20 to 40潞C)
(80 to 120潞C)
Glass Transition Temperature, Tg, 潞C
Coefficient of Thermal Conductivity, W/m潞C
Modulus, MPa
(psi)
Tensile Strength @ peak, MPa
(psi)
Elongation @ peak, %
Weight Loss, 30 minute @ 200潞C, %
Chloride content, ppm
Sodium content, ppm
Potassium content, ppm
Typical
Value
110 x 10
-6
188 x 10
-6
64
1.5
1,275
(185,000)
25
(3,700)
3.4
3.50
20
1
<1
Flow Curve
The following graph shows a typical flow curve (ascending) as
measured using a Haake rotoviscometer PK100, M10/PK1
2擄Cone system at 23擄C.
SHEAR STRES
S, Pa
1 0000
Electrical Properties
Volume Resistivity, Mil 883D, ohm-cm
< 0.0005
PERFORMANCE OF CURED MATERIAL
(cured for 15 minutes @ 130潞C)
1000
Lap Shear Strength
Copper,
Epoxy (G-10),
100
0.1000
10.00
1.000
SHEA RATE, 1 / s
R
MPa
(psi)
MPa
(psi)
MPa
(psi)
MPa
(psi)
4.8
(690)
3.4
(490)
3.1
(450)
2.8
(400)
100.0
Glass,
Aluminum,
NOT FOR PRODUCT SPECIFICATIONS.
THE TECHNICAL DATA CONTAINED HEREIN ARE INTENDED AS REFERENCE ONLY.
PLEASE CONTACT LOCTITE CORPORATION QUALITY DEPARTMENT FOR ASSISTANCE AND RECOMMENDATIONS ON SPECIFICATIONS FOR THIS PRODUCT.
ROCKY HILL, CT FAX: +1 (860)-571-5473
DUBLIN, IRELAND FAX: +353-(1)-451 - 9959
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