PRELIMINARY
PRODUCT DESCRIPTION
LOCTITE
廬
Product 5140 is a single component, non-
corrosive, self-levelling, room temperature vulcanising (RTV)
silicone sealant. This product cures when exposed to
atmospheric moisture to form a tough rubber coating. The
cured elastomer resists weathering, moisture and ozone, and
retains its flexibility up to 200擄C. Meets requirements of MIL-
A-46146B Group I Type II.
TYPICAL APPLICATIONS
Specifically formulated for potting, sealing and coating of
electronic devices, especially for military, automotive and
industrial electronics.
PROPERTIES OF UNCURED MATERIAL
Typical
Chemical Type
Appearance
Specific Gravity @ 25擄C
Viscosity @ 25擄C, mPa.s (cP)
Brookfield RVT, Method B
Spindle 6 @ 2.5 rpm
@ 20 rpm
Value
Alkoxy Silicone
Rubber
Clear Rubber
1.05
Range
Technical Data Sheet
Product 5140
Worldwide Version September 10, 1999
PERFORMANCE OF CURED MATERIAL
(
cured 7 days @ 50% RH & 23擄C
)
Shear Adhesion Strength, ASTM D1002,
Aluminium to Glass, N/mm
2
(psi)
Steel to Glass, N/mm
2
(psi)
Glass to Glass, N/mm
2
(psi)
1.7
(250)
1.8
(260)
1.7
(250)
TYPICAL ENVIRONMENTAL RESISTANCE
The following tests refer to the effect of environment on
strength. This is not a measure of sealing performance.
Heat Resistance
(7 days @ 200擄C)
Tensile strength, ASTM D412, N/mm
2
(psi)
Elongation, ASTM D412, %
Hardness, Shore A, ASTM D2240
1.8
(260)
200
30
85,000
35,000
30,000 to
140,000
15,000 to 55,000
Hydrolytic Stability
(After 28 days @ 95擄C & 98% RH)
Tensile strength, ASTM D412, N/mm
2
(psi)
Elongation, ASTM D412, %
Hardness, Shore A, ASTM D2240
1.7
(250)
235
22
TYPICAL PROPERTIES OF CURED MATERIAL
Physical Properties
(
cured 7 days @ 50% RH & 23擄C)
Coefficient of thermal expansion, ASTM E831, /擄C
Tensile Strength, ASTM D412, N/mm
2
(psi)
Elongation, ASTM D412, %
Hardness, ASTM D2240, Shore A
Water absorption, 24hrs. @ RT., ASTM D570, %
Tear (die B), ASTM D624, kN/m
(pli)
Non-volatile content, ASTM D2369, %
Water vapour transmission, ASTM E96, gram/hr./M
2
Tack free time, minutes
2.93 x 10
-4
2.8
(400)
250
30
0.05
17.5
(100)
96
1.5
165
Electrical Properties
Dielectric constant & loss, ASTM D150, 25擄C
@ 100 Hz
@ 1 kHz
@ 1 MHz
Volume Resistivity , ASTM D257,
鈩?cm
Dielectric Strength, ASTM D149, kV/mm, 4mm
film
Constant
3.05
3.05
3.05
Loss
0.015
0.009
0.0016
7.0 x 10
16
16
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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