PRODUCT DESCRIPTION

LOCTITE. Product 5140 is a single component, noncorrosive,
self-leveling, room temperature vulcanizing (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°C. Meets requirements of MILA-
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
Value Range

Chemical Type Alkoxy Silicone Rubber

Appearance Clear Rubber

Specific Gravity @ 25°C 1.05

Viscosity @ 25°C, mPa.s (cP)

 Brookfield RVT, Method B

 Spindle 6 @ 2.5 rpm 85,000 30,000 to 140,000

 @ 20 rpm 35,000 15,000 to 55,000

TYPICAL PROPERTIES OF CURED MATERIAL
Physical Properties

(cured 7 days @ 50% RH & 23°C)

Coefficient of thermal expansion, ASTM E831, /°C 2.93 x 10-4

Tensile Strength, ASTM D412, N/mm2 2.8

 (psi) (400)
Elongation, ASTM D412, % 250
Hardness, ASTM D2240, Shore A 30
Water absorption, 24hrs. @ RT., ASTM D570, % 0.05
Tear (die B), ASTM D624, kN/m 17.5

 (pli) (100)
Non-volatile content, ASTM D2369, % 96
Water vapor transmission, ASTM E96, gram/hr./M2 1.5
Tack free time, minutes 165

Electrical Properties
Dielectric constant & loss, ASTM D150, 25°C Constant Loss

 @ 100 Hz 3.05 0.015

 @ 1 kHz 3.05 0.009

 @ 1 MHz 3.05 0.0016
Volume Resistivity , ASTM D257, W.cm 7.0 x 1016
Dielectric Strength, ASTM D149, kV/mm, 4mm 16
film

Technical Data Sheet
Product 5140

Worldwide Version, September 1996
PERFORMANCE OF CURED MATERIAL

(cured 7 days @ 50% RH & 23°C)

Shear Adhesion Strength, ASTM D1002,
Aluminum to Glass, N/mm2 1.7
(psi) (250)
Steel to Glass, N/mm2 1.8
(psi) (260)
Glass to Glass, N/mm2 1.7
(psi) (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°C)

Tensile strength, ASTM D412, N/mm2 1.8

 (psi) (260)
Elongation, ASTM D412, % 200
Hardness, Shore A, ASTM D2240 30

Hydrolytic Stability

(After 28 days @ 95°C & 98% RH)

Tensile strength, ASTM D412, N/mm2 1.7

 (psi) (250)
Elongation, ASTM D412, % 235
Hardness, Shore A, ASTM D2240 22

GENERAL INFORMATION
This product is not recommended for use in pure oxygen
and/or oxygen rich systems and should not be selected
as a sealant for chlorine or other strong oxidizing
materials.

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.

Directions for use

For best performance surfaces should be clean and free of
grease or other contaminants . Full performance properties
will develop over 72 hours. Moisture curing begins
immediately after the product is exposed to the atmosphere,
therefore parts to be assembled should be mated within a
few minutes after the product is dispensed. Excess material
can be easily wiped away with non-polar solvents.

In case of eye contact flush at least 15 minutes with water
and seek medical attention. To avoid contact use the
applicator nozzle provided.

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

TDS 5140 September 1996

Storage

Product shall be ideally stored in a cool, dry location in
unopened containers at a temperature between 2°C to 8°C
(36°F to 46°F) unless otherwise labeled. Optimal storage is
at the lower half of this temperature range. To prevent
contamination of unused product, do not return any material
to its original container. For further specific shelf life
information, contact your local Technical Service Center.

Data Ranges

The data contained herein may be reported as a typical value
and/or range (based on the mean value ±2 standard
deviations). Values are based on actual test data and are
verified on a periodic basis.

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, Loctite
Corporation specifically disclaims all warranties
expressed or implied, including warranties of
merchantability or fitness for a particular purpose,
arising from sale or use of Loctite Corporation’s
products. Loctite 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 Loctite
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.

Loctite is a Trademark of Loctite Corporation U.S.A.