Sealing
material is any substance that is used to seal joints or fill cracks in
a porous surface. It seals any gaps, thus shutting out heat, water,
noise or vibration. Sealing material comprises from 45% to 90% by weight
exfoliated graphite, from 5% to 20% by weight thermosetting resin and
from 5% to 50% by weight fibrous filler which is heat resistant at 250
degree C. the fibrous filler has fibers atleast 90% of which have a
fiber length of less tan 200 .mu.m, and an aspect ratio of less than
10:1.
It is used to seal valves, pumps, reaction vessels, air duct, borehole,
wells, etc. The most basic requirements to understand while choosing a
seal are pressure, temperature, dimensions, and fluid media to be
sealed. Temperature conditions greatly affects the work. The running
friction of the seal itself can cause local temperature spikes if it is
not effectively dissipated by the fluid or the housing. Specifying a
seal for an application is always a matter of balancing various
characteristics. In dynamic applications, the most common consideration
is friction versus leakage control.
Materials
Flexicarb Graphite Sealing Material
It is a pure exfoliated graphite material exhibiting excellent sealing
characteristics, withstanding a wide range of temperatures, pressures
and chemicals. This is a homogenous material free of respirable fibers,
binders and additives. It is chemically inert. Its low permeability and
chemical resistance make it an ideal choice as a sealing material.
Polyurethane
It is a sealing material known to be the most suitable for joints in
painted materials and have been used on painted office buildings,
apartment buildings, shopping centers and schools.
Vinyl
It is a sealing material used generally in air duct seal. It remains
rubbery and never cracks. It sticks to the holes in the air duct without
coating the rest of the duct. It is safe to use and is tested to last
over 10 years without failure.
S-Ecopur
It is an ideal sealing material for dry running conditions, high
sliding speeds, high-pressure dynamic applications, reduction of
breakout forces and water based fluids.
Bitumen
It is a stable material for most minor joint and crack sealing. It has
increased stickability and enhanced friction properties.
Cement
It is widely used as a sealing material in annulus and borehole walls.
Glass
It is used as high temperature sealing material for fuel cells.
Neoprene
A general purpose closed cell industrial grade rubber having good
resistance to ozone, fuel oils and fats.
Fluoroelastomer
It is a dimensionally stable sealing material with the best combination
of products that can contribute to a longer seal life and uninterrupted
sealing service demanded universally by the automobile industry.
Oil Seals
Oil seals finds wide application in various sectors of the automobile
industry. These come in a wide range of standard and non-standard
designs.
Marble Silicon
It is one component joint sealing material on basis of silicon rubber
which hardens in contact with atmospheric humidity. No discoloration in
the contact area. It is used for expansion and connecting joints.
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