NON METALLIC GASKETS
Non metallic gaskets usually consist of composite sheet
materials for low-pressure applications. Suitable for a wide range of
general and corrosive chemical services. Some types are: Elastomers,
Non-asbestos sheeting and graphite sheet products. We also stock PTFE
envelope gaskets that offer a cost effective solution for sealing
relatively low temperature and pressure applications containing corrosive
fluids. PTFE envelope gaskets consist of a sheet/composite insert
encapsulated in the bore by a thin PTFE sheath. Wilmington Rubber and
Gasket has the capability to cut gaskets to fit standard flanges, any
shape that can be formed with a die, or hand cut to suit your needs.
SEMI-METALLIC GASKETS
A composite gasket consists of both non-metallic and metallic
materials. The metal generally provides the strength 
and resilience of the gasket. These gaskets are suitable for both low and
high temperature/ pressure applications.
A requirement of any gasket is the ability to recover under variable
loads. That’s why Wilmington Rubber and Gasket stocks various types of
spiral wound gaskets. The effects of pressure and temperature
fluctuations, the temperature difference across the flange face, together
with flange rotation, bolt stress relaxation and creep, demand a gasket
with adequate flexibility and recovery to maintain a seal under variable
and uneven loading. Our spiral wound gaskets meet these requirements. They
may include a centering ring, an inner ring or both. Filler and wire can
be changed to accommodate different chemical compatibility requirements.
METALLIC GASKETS
Can be fabricated from one metal or a combination of metallic
materials, in a variety of shapes and sizes. Suitable for high
temperature/pressure applications. High loads are required to seat
metallic gaskets, relying on the deformation of the material into the
flange imperfections.
