Superior Seals, Exceptional Service

D94-30P

Robotically Dispensed Gasket Materials

Product
Technology
Duro
Mix Ratio
Description
OEM Specs
D94-30P
CIPG
30
1:1
 2pt, heat cure, non-slump liquid silicone rubber for fluid and air / dust / water sealing GM 236M Type 2

Dow Corning® D94-20P
Liquid Silicone Rubber
A two-part, nonslumping, heat-cure liquid silicone rubber elastomer designed to be easily mixed, dispensed, and cured directly on automotive and other industrial components to form a compression gasket.

FEATURES
• Noncorrosive
• Low odor
•Unprimed adhesion

COMPOSITION
• Two-part, heat-cure, liquid silicone rubber

APPLICATIONS
• Sealing engine valve covers, cam covers, front covers, and oil pans, as well as other automotive and industrial components

TYPICAL PROPERTIES

1 Tested at 23°C (73°F) and 50% relative humidity.
2 Corporate Test Method. Methodology is available from your Dow Corning representative.
3 After curing 5 minutes at 150°C (302°F).
4 After curing 30 minutes at 150°C (302°F) in an aluminum fixture.
5 “MOBIL” is a registered trademark of Mobil Oil Corporation.
6 “Prestone” is a registered trademark of Prestone Products Corporation.
7 “Dexcool” is a registered trademark of General Motors Corporation.

DESCRIPTION
Dow Corning® D94-30P Liquid
Silicone Rubber is a two-part, nonslumping,
heat-cure silicone elastomer
designed to be easily mixed,
dispensed, and cured directly on
automotive and other industrial
components to form a compression
gasket. It is resistant to engine oils,
water/glycol mixtures, and many
other automotive and industrial
fluids with the exception of fuels
and solvents.
Dow Corning D94-30P Liquid
Silicone Rubber, mixed in a 1:1
ratio, exhibits excellent unprimed
adhesion to a variety of plastic
and metal substrates. For these substrates,
the gasket will not become
loose during shipping and handling,
assembly, or operation.
The cured-in-place gasket (CIPG)
concept made possible with
Dow Corning D94-30P Liquid
Silicone Rubber provides a successful
alternative to traditional gasketing
methods using manually
installed preformed gaskets. The
CIPG approach provides increased
design flexibility, as the gaskets can
be dispensed on complex parts.
The gasket can be changed simply
by reprogramming the dispensing
system.
The dispensed gaskets are applied
and positioned in a reproducible
fashion, ensuring good sealing performance.
The dispensing/curing
process lends itself ideally to a
continuous, fully automatic, costeffective
operation.

 HOW TO USE
Substrate Preparation
Adhesion is important to ensure
the gasket stays where it belongs.
Therefore, you need to keep a few
things in mind.

First, this product bonds better
to some substrates than others.
For instance, metals typically are
easier to adhere to than plastics,
and some low-surface-energy
plastics such as polyethylene and
polypropylene are very difficult
to bond to.

Regardless of the substrate, it must
be clean for best adhesion. This
means no dirt, oils, release agents,
dust, or shavings. To clean the
substrate, it may be necessary to
wash the part prior to applying the
gasket material. Keep in mind that
not all washing techniques achieve
the same results. Certain cleaning
solutions can leave a residue that
may actually hamper adhesion,
so be sure to test your washing
process thoroughly.

Finally, some substrates—even
when properly washed—will
require additional treatment to
achieve good adhesion. This could
mean plasma, corona, or flame
treatment; chemical priming; or,
in some cases, both. If you think
your application will require
surface treatment, contact your
Dow Corning representative for
more information.

Metering/Mixing
Dow Corning D94-30P Liquid
Silicone Rubber should be metered
using a positive displacement
device, such as a gear pump, and
mixed using static or dynamic mixing.
For information on suitable
metering and mixing equipment,
contact Dow Corning.


Dispensing
Apply the product to the prepared
surface in a continuous, uniform
thickness. Dow Corning D94-30P
Liquid Silicone Rubber should be
dispensed using a suitable robot,
XYZ table, or other motion device
to obtain a uniform seal.

The gasket bead size to be specified
is a function of the anticipated
gap size for the part and the
flange width. Consult your
Dow Corning representative
for design recommendations.


Working Time
Dow Corning D94-30P Liquid
Silicone Rubber has a working time
of about 30 minutes at 23°C (73°F)
for automated processes. Higher
temperatures will reduce working
time.

Cure
When properly mixed, a bead
of Dow Corning D94-30P Liquid
Silicone Rubber on a typical component
will cure in five to eight
minutes at 150°C (302°F). This
heat can be developed with a
traditional convection oven or
an infrared oven. Typically, the
portion of the part directly underneath
the bead will be the last section
to reach temperature. This
area should be at 150°C (302°F)
before the part leaves the oven.

Cure Inhibition
Certain materials, chemicals,
curing agents, and plasticizers can
inhibit the cure of Dow Corning
D94-30P Liquid Silicone Rubber.
The most notable are organo-tin
and other organo-metallic compounds;
silicone rubber containing
an organo-tin catalyst; sulfur,
polysulfides, polysulfones, and
other sulfur-containing materials;
and unsaturated hydrocarbon
plasticizers. Many lubricating oils
contain sulfur.

USABLE LIFE AND STORAGE
When stored in dry conditions
below 35°C (95°F) in original
containers, Dow Corning D94-30P
Liquid Silicone Rubber has a shelf
life of 9 months from the date
of manufacture.


PACKAGING
Dow Corning D94-30P Liquid
Silicone Rubber is available in
19-L/36.3-kg (5-gallon/80-lb)
pail kits and 208-L/362.8-kg
(55-gallon/800-lb) drum kits.

HANDLING PRECAUTIONS
PRODUCT SAFETY INFORMATION
REQUIRED FOR SAFE
USE IS NOT INCLUDED IN
THIS DOCUMENT. BEFORE HANDLING,
READ PRODUCT AND
MATERIAL SAFETY DATA SHEETS
AND CONTAINER LABELS
FOR SAFE USE, PHYSICAL AND
HEALTH HAZARD INFORMATION.
THE MATERIAL SAFETY
DATA SHEET IS AVAILABLE
FROM YOUR DOW CORNING
REPRESENTATIVE, OR
DISTRIBUTOR, OR BY WRITING
TO DOW CORNING CUSTOMER
SERVICE, OR BY CALLING
1-517-496-6000 begin_of_the_skype_highlighting              1-517-496-6000      end_of_the_skype_highlighting.

LIMITATIONS
Do not use in applications where
the product will be in constant contact
with fuels or solvents. Mixing
part A and part B at a ratio other
than 1:1 may lead to poor product
adhesion and seal performance.
This product is neither tested nor
represented as suitable for medical
or pharmaceutical uses. Not for
human injection.


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 of 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.

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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