Datasheet

DOW CORNING®
Construction Primer
Guide
Product Information
DESCRIPTION
The DOW CORNING Brand Primer
Range is a series of surface treatments
designed to enable DOW CORNING®
Brand Silicone Sealants to achieve
optimum adhesion to a wide range of
substrates.
BENEFITS
Use of the primers has shown the
following benefits when used with the
indicated DOW CORNING silicone
sealants:
Optimizes adhesion of sealant to
surface
•
More rapid development of adhesion to
surface
•
It is essential that all surfaces are clean,
dry and free from contamination prior to
the application of any primer or sealant.
For specific technical recommendations,
contact your local Dow Corning Regional
Service Center.
RANGE
The DOW CORNING Construction
Primer Range consists of the following
primers:
DOW CORNING® 1200 OS Primer
DOW CORNING® P Primer
DOW CORNING® Barrier Primer
DOW CORNING® 1205 Primer
DOW CORNING
1200 OS Primer
DESCRIPTION
DOW CORNING 1200 OS Primer is an
air drying primer supplied as a dilute
solution of moisture reactive materials in
volatile siloxane.
TYPICAL PROPERTIES
Specification writers: These values are not
intended for use in preparing
specifications.
As supplied
Color: Clear
•
Specific gravity (ASTM D 1298): 0.82
•
Viscosity at 25°C (77°F) (mPa.s): 1.0
•
Non-volatile content: 5%
•
Flash point - closed cup: 27°C (80.6°F)
•
After application
Minimum sealant application time at
25°C (77°F): 15 minutes
•
Maximum sealant application time at
25°C (77°F): 360 minutes
•
TECHNICAL DATA
Packaging: 500ml container
•
Application temperature: 5-35°C
(41-95°F)
•
APPLICATIONS
DOW CORNING 1200 OS Primer is used
to improve both the quality and speed of
adhesion development to room
temperature vulcanizing silicone sealants
to a variety of common non-porous
substrates.
APPLICATION METHOD
Surfaces to which primer will be applied
should be thoroughly cleaned by wiping
using an appropriate solvent on a coarse
lint-free cloth. Ensure surfaces are wiped
dry immediately after cleaning. Please
consult the relevant product information
sheet for recommendations on cleaning
products.
Prior to application, sufficient primer
should always be transferred to a working
container and not used directly from the
original container. Do not decant more
primer than can be used in one hour. This
procedure will prevent wastage and
contamination of the bulk material.
DOW CORNING 1200 OS Primer should
be applied using a lint-free cloth to form a
thin film on the surface of the substrate.
Excessive over-application of the primer
will cause the formation of a white
powder that will impair the adhesion of
the sealant. Should this occur, it will be
necessary to reclean the surface and
reapply the primer.
After application of the primer, working
containers should be cleaned with an
appropriate solvent. Any unused primer
that has been decanted should be
discarded in an appropriate manner and
not returned to the original container.
HANDLING PRECAUTIONS
The following points should be taken into
account when using DOW CORNING
1200 OS Primer:
Flammable
•
Avoid contact with skin and eyes
•
Use only in well ventilated areas
•
USABLE LIFE AND STORAGE
Containers should be kept tightly sealed
when not in use. The primer hydrolyses
upon contact with air moisture, and
prolonged exposure will reduce or destroy
its effectiveness.
Once hydrolyzed, indicated by a white
precipitate or milky appearance, the
primer cannot be reclaimed and will
contaminate any unreacted primer with
which it is mixed.
When stored between 5°C (41°F) and
30°C (86°F) in the original unopened
containers, this product has a usable life of
18 months from the date of production.
DOW CORNING
P Primer
DESCRIPTION
DOW CORNING P Primer is an air
drying primer supplied as a solution of
reactive materials in solvent.