SILASTIC® 3483
Base and
SILASTIC® 83 Curing Agent
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High Strength Silicone Mold Making Rubber |
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| FEATURES : |
• Outstanding release properties
• High flowability and long working
time
• Low hardness
• High tear resistance
High elasticity, for easy removal of
complex replica parts
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Can be made thixotropic (nonflowable)
for vertical surface
replication |
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APPLICATIONS
• SILASTIC 3483 is suited for the detailed reproduction of figures, art objects
and similar items. |
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TYPICAL PROPERTIES
Specification writers: These values are not intended for use in preparing specifications.
Please contact your local Dow Corning sales representative prior to writing specifications
on this product. |
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| Property |
Unit |
Value |
| Base and Curing Agent mixture (100:5 by weight) |
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| Mixed viscosity |
mPa.s |
17,000 |
| Color |
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White |
| Working time of catalyzed mixture at 23°C (73.4°F) |
minutes |
90-120 |
| Curing time |
hours |
24 |
| Cured, tested after 7 days at 23°C (73.4°F) |
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| Hardness (Shore A) |
|
13 |
| Tensile strength |
MPa |
3.5 |
| Elongation at break |
% |
600 |
| Tear strength |
kN/m |
25 |
| Relative density at 25°C (77°F) |
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1.15 |
| Linear shrinkage |
% |
0.2-0.4 |
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| DESCRIPTION |
| SILASTIC 3483 Moldmaking Rubber
is a two-component material
consisting of SILASTIC 3483 Base,
which when mixed with SILASTIC
83 Curing Agent, cures at room
temperature by a condensation
reaction. A range of materials can be
cast into the cured silicone mold:
plaster, polyurethane and polyester
resins are materials typically used. |
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| HOW TO USE |
| Substrate preparation
The surface of the original should be
clean and free of loose material. If
necessary, and in particular with
porous substrates, use a suitable
release agent such as petroleum jelly
or soap solution. |
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Mixing
Thoroughly stir SILASTIC 3483 Base
before use as filler separation may
occur upon prolonged storage.
Weigh 100 parts of SILASTIC 3483
Base and 5 parts SILASTIC 83
Curing Agent in a clean container.
Mix together until the curing agent is
completely dispersed in the base.
Hand or mechanical mixing can be
used, but do not mix for an extended
period of time or allow the
temperature to exceed 35°C (95°F).
Mix suitably small quantities to
ensure thorough mixing of the
SILASTIC 3483 Base and SILASTIC
83 Curing Agent.
It is strongly recommended that entrapped air be removed in a vacuum
chamber, allowing the mix to
completely expand and then collapse.
After a further 12
minutes under
vacuum, the mix should be inspected
and can be used if free of air bubbles.
A volume increase of 35
times will
occur on vacuum de-airing the
mixture, so a suitably large container
should be chosen.
Caution: prolonged vacuum will
remove volatile components from the
mix and may result in poor thick
section cure and non-typical
properties.
Note: If no vacuum de-airing
equipment is available, air entrapment
can be minimized by mixing a small
quantity of SILASTIC 3483 Base and
SILASTIC 83 Curing Agent, then
using a brush, painting the original
with a 12mm
layer. Leave at room
temperature until the surface is bubble
free and the layer has begun to cure.
Mix a further quantity of base and
curing agent and proceed as follows
to produce a final mold.
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Pouring the mixture and
curing
Pour the mixed SILASTIC 3483 Base
and SILASTIC 83 Curing Agent as
soon as possible onto the original,
avoiding air entrapment. The
catalyzed material will cure to a
flexible rubber within 24 hours at
room temperature (22°C24°
C/
71.675.2°
F) and the mold can then be
separated from the original. If the
working temperature is significantly
lower, the cure time will be longer. If
the room temperature or humidity is
very high, the working time of the
catalyzed mixture will be reduced.
The final mechanical properties of the
mold will be reached within 7 days. |
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| ADDITIONAL
INFORMATION |
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Reproduction of vertical
surfaces
If a skin mold is required of a vertical
object or surface and cannot be made
by normal pouring techniques, the
catalyzed mixture can be made non
flowable by the addition of
SILASTIC® Thixo Additive. |
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Resistance to casting materials
The chemical resistance of fully cured
SILASTIC 3133 is excellent, and
similar to all condensation cure
silicone elastomers. It should be noted
however that ultimately, resins and
other aggressive casting materials will
attack silicone molds, changing
physical properties, surface release
and possibly mold dimensions. Molds
should be checked periodically during
long production runs.
1. Prepare the original as described
earlier.
2. Brush the original with a thin layer
of catalyzed mixture. Repeat the
operation when the first layer has
started to cure, to achieve a coating
thickness of >2mm. Leave to cure at
room temperature until the material is
tacky.
3. Prepare a new catalyzed mixture of
SILASTIC 3483 and add 3% by
weight of SILASTIC Thixo Additive
and mix thoroughly until a paste
consistency is reached. De-airing of
the mixture is not required.
4. Using a spatula, cover the coated
original with the thixotropic coating
until all undercuts are filled; leave to
cure for 24 hours at room temperature.
5. Construct a support mold using
polyester resin or plaster and allow to
set in contact with the silicone
coating. Carefully remove the support
mold. Peel the rubber off the original
and place in the support mold. |
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Use at high temperatures
Some molds produced from
condensation cure silicone rubbers
can degrade when exposed to
temperatures above 150°C (302°F)
over a period of time or when totally
confined in storage at high ambient
temperatures. This can result in
softening and loss of elastic properties.
Please contact a Dow Corning
distributor for further advice. |
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Resistance to casting materials
The chemical resistance of fully cured
SILASTIC 3483 is excellent, and
similar to all condensation cure
silicone elastomers. It should be noted
however that ultimately, resins and
other aggressive casting materials will
attack silicone molds, changing
physical properties, surface release
and possibly mold dimensions. Molds
should be checked periodically during
long production runs. |
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Note:
SILASTIC 3483 is an industrial
product and must not be used in food
molding, dental and human skin molding applications. |
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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. |
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USABLE LIFE AND
STORAGE
When stored at or below 32°C
(89.6°F) in the original unopened
containers SILASTIC 3483 Base and
SILASTIC 83 Curing Agent have a
usable life of 9 months from the date
of production.
When stored below 20°C (68°F),
SILASTIC Thixo Additive may
solidify. The product can be easily
liquified by immersing the closed
container in warm water. |
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PACKAGING
SILASTIC 3483 Base is available in
5kg, 20kg and 200kg containers.
SILASTIC 83 Curing Agent is
available in 0.25kg, 1kg and 10kg
containers. SILASTIC 3483 Base
with SILASTIC 83 Curing Agent is
also available as a 1.05kg kit.
SILASTIC Thixo Additive is
available in 100g and 500g containers. |
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LIMITATIONS
This product is neither tested nor
represented as suitable for medical or
pharmaceutical uses. |
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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. |
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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. |
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