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Silicone
is the elastomer of choice for most medical device manufacturers
because of it's unique performance characteristics; the combination
of which cannot be achieved by any other elastomer product. Truly
a strong but worthy claim!
WHAT is it?
Silicone elastomers are based on a unique chemistry
developed in the early 1960's. Basically, a strong alternating silicon
and oxygen atom backbone in the silicone molecule is responsible
for many of its inherent properties. Different functional groups
are chemically linked to the silicon atom to modify its behavior
for performance in chemical, drug, reagent or specific media resistance.
Silicone elastomers are simply very long chains of silicone molecules,
called polymers, chemically bonded together to achieve specific
property profiles.
WHY is it chosen?
Silicone's chemical structure imparts inherent properties:
- Wide temperature performance from -75f to 500F.
- Excellent electrical insulative properties; non-conductive and
constant dielectric
strength through temperature extremes
- Good Compression Set resistance
- Wide range of Mechanical Properties in the Elastomer form: (typical
values)
| Duromerter hardness, Shore
A |
10-80* |
| Tensile strength, psi |
1,200* |
| Elongation, % |
900* |
| 100% Modulus, psi |
1000* |
| Tear resistance,
pi |
250* |
| Compression Set, % |
15* |
(*Although these represent average typical values,
we can modify elastomer compounds to optimize each property; ie.
Tear resistance to 300 psi ave.)
Through the years, silicone has also demonstrated
superior performance properties as it relates to it's use in medical
devices:
Superior compatibility with human and animal tissue and body
fluids - does not irritate skin or other organs.
Is extremely soft and pliable, easily conforms to different
cavity shapes.
Biologically inert - Does not support the growth of bacteria
Does not stain or corrode other materials which it contacts.
Withstands common sterilization methods - alcohol wash, dry
heat, steam autoclave, ethylene oxide, gamma radiation and electron
beam.
Most silicones have been shown to meet the requirements for
USP Class VI, FDA Tripartite Biocompatibiility Guidelines and ISO
10093 requirements.
WHAT do we do with Silicone Elastomers?
Saint-Gobain Performance Plastics is a custom fabricator
who converts uncured silicone platinum or peroxide curable elastomers
into the final form that is desired by our customers utilizing one
of the techniques explained under Extrusion or Molding and/or Assembly.
Many products are available from silicone suppliers
that will meet the mechanical profiles, however, when special needs
arise, we customize a product through specialty blending to achieve
the desired properties. When custom fabricators contract with a
customer to assist in the development of the components or final
assembly, it is critical that Engineers are willing to describe
the application in it's entirety because subtle performance characteristics
can alter the choice of a compound or the design of a tool.
It is our job to evaluate all the varied input on
a project and apply our years of experience to assist our customers
in the development of their product to achieve and exceed their
performance goals. To have an engineer contact you about your project
today, link here to enter your information.
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