A substance that's
“chemically inert” means it won't react to anything. You can
leave a chemically inert plastic out in the sun, douse it with water,
or pour acid on it. You won't get a nudge out of it.
Being inert is important for
essential
substances such as polytetrafluoroethylene (PTFE), known to the
world simply as Teflon. Generally, it means PTFE can be used in a
wide array of situations sans risk of a chemical reaction that may
pose a health or safety threat. The bond of carbon and fluorine atoms
is strong enough to shrug off anything that comes their way.
On an atomic point of view,
the secret for inert of substances lies in the outer shells. Case in
point: noble gases; their outer shells have the right amount of
electrons, which is 8 (save for helium, with 2). As these gases have
the right amount of electrons, there's no more reason for them to
gain or lose some. In addition, inert substances themselves don't
participate in any chemical reaction.
This is good news for
industries that will be using inert substances. Handling chemicals
has always been an edgy job requiring nerves of steel to make sure
you don't drop that vial of volatile compounds. Substances like PTFE
were chosen to assume various duties that commonly come in contact
with a variety of compounds and other substances.
Most
mechanical devices aren't composed of just a single piece; they're usually a
well-organized assembly of various components that work in conjunction with
each other to produce the desired effect. Naturally, these parts need to be
joined securely lest the entire device fails to work or falls apart. However,
linked parts, particularly those parts that aren't made to be permanently
linked together, are sure to leak essential mechanical fluids without any form
of sealing.
Sealing
two parts together involves more than just covering up the seam. It often
entails pressurizing the joint to guarantee absence of leakage without having
to resort to welding both parts together. Seals made from polymer such as
gaskets and o-rings are some of the more common sealing materials used for
engines and such.
It's
important for engines and other devices that experience high pressures and temperatures
to have resilient polymer seals installed in vital areas. Temperature can warp
or even outright destroy seals, and that's never good for an engine.
Thankfully, modern seals are made from specially developed polymers that are
very resistant to heat and even the cold. Operators of these machines should
still be wary of the condition of their seals, and shouldn't hesitate to have
their machinery examined if something doesn't feel right about it.
Source:
http://www.ehow.com/how_7902518_shrink-rubber-seals.html
Static polymer seals are
found in various settings, most notably in the industrial,
transportation, oil and gas, aerospace and defense, and medical
fields. These components add a great deal of structural integrity to
a wide range of machinery by virtue of their exceptional resistance
to extreme temperatures and harsh chemical substances. Sensitive
equipment in the above areas require high-quality polymer seals to
withstand considerable wear and tear that build up over years of
constant usage.
Aside from ensuring the
durability of moving machine parts, polymer seals also function as
excellent stabilizers that hold things in place. Likewise, key
components of sensitive machinery subjected to constant heat and
friction require special polymer seals that allow them to resist
damage for far longer. It is this versatility that makes polymer
seals so useful in a wide range of applications and helps ensure the
safety of everyone involved.
Given that polymer seals
fulfill vital functions, it is, thus, crucial to obtain these
products only from reputable sources. While it is easy enough to find
vendors online with a simple search, you might want to look into the
credibility of prospective suppliers. Industry forums or online
review sites should prove rather helpful in this regard.
Polymer is a durable
material that is used for many industrial applications such as
construction, plumbing and even the automotive industry. Its wide
array of uses is thanks to the fact that it's extremely water
resistant and fade-proof.
Resin
Durable polymer begins from
a humble resin; a clear, liquid product made of plastic. To make the
hardened polymer, the liquid plastic resin is infused with a liquid
catalyst. When these are mixed in the appropriate amount, the
catalyst activates the resin and begins the hardening process.
Curing
Curing refers to the
chemical process that occurs as the resin shifts from liquid to solid
state. Depending on the materials that make up the polymer, the resin
can cure from 48 to 72 hours. In this process, bubbles usually form,
but they can be removed from the final product through the
application of heat.
Polymer
Once the resin has
completely cured, water and a clean, damp cloth can be used to clean
it up. Minor scratches can be rubbed off while the polymer is still
hot. After cleaning, the finished product is now ready to be used as
polymer seals.
Polymer-based
products include credit cards, cookware, liquid absorbing
crystals, take-out containers, and PET bottles.
