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D94-45M

Robotically Dispensed Gasket Materials

Product
Technology
Duro
Mix Ratio
Description
OEM Specs
D94-45M
CIPG
45
1:1
 2pt, heat cure, non-slump, liquid silicone rubber for fluid and air / dust / water sealing Chrysler
MS-6F42B

Dow Corning® D94-45M
Two-part silicone elastomer for integrated compression seals

FEATURES
• Two-part addition cure silicone elastomer
• Hardness suitable for sealing applications under high clamping loads
• Non-sag nature yields accurate, uniform gasket beads of precise dimensions as defined by robot application parameters
• User-friendly, easy to handle mix ratio
• Fast cure at elevated temperatures, no post-curing
• High tear resistance
• Low compression set
• Good adhesion to many substrates
• Long term stability over a wide temperature range (50°C to +200°C)
• Does not require solvents, CFCs other environmentally harmful materials for processing

APPLICATIONS
• DOW CORNING D9445M is designed to be dispensed and cured directly on automotive and other industrial components to form integrated gaskets.

• Typical applications include gaskets for components which require high clamping forces, e.g. cam covers, water pumps, ABS modules and thermostat housings.

TYPICAL PROPERTIES

1. Extrusion rate: 3.2mm nozzle at 0.63MPa.
* CTM: Corporate Test Method, copies of CTMs are available on request.
ASTM: American Society for Testing and Materials.

DESCRIPTION
DOW CORNING D9445M
is a two
component heat-cure silicone
elastomer, designed to be easily
mixed and dispensed via meter-mix
equipment. It is cured directly on
automotive and other industrial
components to form an integrated,
high strength compression seal. It is
resistant to many industrial fluids (e.g.
engine oils, water/glycol mixtures)
over a broad temperature range with
the exception of fuels and non-polar
solvents.

 

THE CURED-IN-PLACEGASKET
CONCEPT (CIPG)
The 'Cured-in-Place-Gasket' concept
made possible with DOW CORNING
D9445M Elastomer provides a
successful alternative to traditional
gasketing methods using manually
installed preformed rubber gaskets.
This approach provides greater design
flexibility as the robotically applied
liquid silicone beads can easily follow
complex surface geometries.
Additionally, changes in part design
can be rapidly accomodated by
reprogramming the dispensing system.
The extruding seals are applied and
positioned with excellent
reproducibility time after time,
ensuring good sealing performance.
Equally important, the sealing/curing
process lends itself ideally to a
continuous, fully automated operation
thus providing meaningful savings on
the costs associated with manual
gasket installation.

HOW TO USE
Substrate Preparation
DOW CORNING D9445M
adheres to many metallic and plastic
substrates (normally without using
primer). This feature ensures the
cured gaskets will not be displaced
during packaging or handling of the
sealed component. Regardless of the
substrate, the sealing surfaces should
be clean and free of dirt, oils, and
release agents to ensure good
adhesion.

In most instances washing with waterbased
industrial detergents will
remove these contaminants. Some
substrates however will require
additional treatment to achieve good
adhesion. This could mean plasma,
corona, flame treatment or chemical
priming. Contact Dow Corning for
more information.

Processing
DOW CORNING D9445M
is optimally mixed, dispensed and
applied to the components to be
sealed using a fully automated and
integrated process.

Metering/Mixing
The mixing step is succesfully carried
out with commercially available twocomponent
metermix pumps designed to work on a 1:1 weight
ratio. The A and B components are
pumped from pails or drums using
followerplate mounted piston pumps,
then fed into smaller, precise gear or
piston pumps where the actual
metering takes place. The precisely
metered A and B components are then
mixed by means of standard multielement
static mixers. The working
time of the A/B mixture at room
temperature is about 4-6 hours and
this eliminates the danger of blocking
the mixer with cured product during
normal production stops.
For information on suitable metering
and mixing equipment, contact
Dow Corning.

Application
For automated bead application the
mixing head is attached to a robotic
arm or alternatively the wrist
applicator of an XYZ
table gantry.
Typically the metermix
equipment and the robot or XYZ
table are fully integrated in a system which
dispenses precisely metered volumes
of uncured elastomer in a preprogrammed
path onto the component to be sealed.
The desired bead dimensions are achieved by a
combination of parameters involving
the pump throughput rate, the
dispensing head diameter and tip
speed, and the distance from tip to
component surface. The nonsag
nature of DOW CORNING D9445M
ensures that the dispensed bead
dimensions remain unchanged after
the bead is cured. The gasket bead
size is a function of the sealing gap
and the flange width. Please consult
Dow Corning for design
recommendations.

Cure
Curing and adhesion of
DOW CORNING D9445M gasket
beads are achieved by submitting the
uncured elastomer to a temperature of
150°C for 6-8 minutes. In an
automated process the components to
be sealed will typically be mounted
on a conveyor system and the bead
applied by robot with a typical cycle
time of 10 to 45 seconds per
component (depending on size). The
gasket beads are then cured by
passing the sealed components
through a heating tunnel. The required
cure time of 6-8 minutes is obtained
by appropriate dimensioning of the
tunnel length for a given conveyor
speed. A particularly efficient way to
transfer heat to the elastomer for
effective curing, and to minimize heat
dissipation in the mass of the
component, is the use of focused
infrared heating elements.

TECHNICAL SERVICES
For specific information and technical
service relating to sealing
technologies please refer to the
Dow Corning Sealing & Gasketing
Expertise Team located in Wiesbaden,
Germany.

HANDLING PRECAUTIONS
PRODUCT SAFETY
INFORMATION REQUIRED FOR
SAFE USE IS NOT INCLUDED.
BEFORE HANDLING, READ
PRODUCT AND SAFETY DATA
SHEETS AND CONTAINER
LABELS FOR SAFE USE,
PHYSICAL AND HEALTH
HAZARD INFORMATION. THE
SAFETY DATA SHEET IS
AVAILABLE FROM YOUR LOCAL
DOW CORNING SALES
REPRESENTATIVE.


DOW CORNING D9445M
is nonhazardous and non-flammable
according to classification guidelines
as laid down in EU-Directive
88/379/EEC and it's subsequent
amendments. The part B of
DOW CORNING D9445M can evolve
hydrogen when in contact with
hydroxy containing materials such as
water, alcohols and others. Ensure
that containers are properly closed
after use in order to avoid
contamination of the components.

USABLE LIFE AND STORAGE
When stored at or below 35°C in the
original unopened containers, this
product has a usable life of 12 months
from the date of production.


PACKAGING
This product is available as kits in
standard industrial container sizes
suitable for use in commercially
available meter/mix equipment. For
details please refer to your
Dow Corning sales office.


LIMITATIONS
This product is neither tested nor
represented as suitable for medical or
pharmaceutical uses.


HEALTH AND
ENVIRONMENTAL INFORMATION
To support customers in their product
safety needs, Dow Corning has an
extensive Product Stewardship
organization and a team of Health,
Environment and Regulatory Affairs
specialists available in each area.
For further information, please
consult your local Dow Corning
representative.
WARRANTY
INFORMATION - PLEASE
READ CAREFULLY
The information contained herein is
offered in good faith and is believed
to be accurate. However, because
conditions and methods of use of our
products are beyond our control, this
information should not be used in
substitution for customer's tests to
ensure that Dow Corning's products
are safe, effective, and fully
satisfactory for the intended end use.
Dow Corning's sole warranty is that
the product will meet the
Dow Corning sales specifications in
effect at the time of shipment. Your
exclusive remedy for breach of such
warranty is limited to refund of
purchase price or replacement of any
product shown to be other than as
warranted. Dow Corning specifically
disclaims any other express or implied
warranty of fitness for a particular
purpose or merchantability. Unless
Dow Corning provides you with a
specific, duly signed endorsement of
fitness for use, Dow Corning
disclaims liability for any incidental
or consequential damages.
Suggestions of use shall not be taken
as inducements to infringe any patent.		  

 

Heat Ageing and Fluid Immersion Resistance

Site Information

Sealing Devices Inc.
4400 Walden Ave. Lancaster, NY 14086
Tel: 716.684.7600
Fax: 716.684.0760
E-mail: seals@sealingdevices.com

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