Premium Biaxial HS10 PTFE - Orginally developed by Dupont, the HS 10 process, evenly distributes fillers and overcomes the "cold flow" issues inherant in virgin PTFE. This process has been utilized by very few companies (including Garlock). Today a new competitor has entered the US market. AS&P now offers a superior product made in Italy by FMI-SPA. FMI has agreed to produce product for AS&P under our trade name Ameri-lon, and also provides FMI Branded Product to AS&P for US distrbution. The quality of FMI's product has been documented and verified by Munster University in Germany. The performance data from Munster University is published at www.gasketdata.org
Filled "Skived" PTFE - The common method of making PTFE sheet is to Skive it. If filling PTFE helps to reduce "cold flow" in gaskets why not fill and skive. The problem is the filler is never evenly displaced when mixed and if it was, the compression used (to form the billet the material is skived from) orients the filler in a common direction. So, the tensile strength of the finished product is strong in one direction and week in another. Skived materials are cheaper to buy but more expensive to use in the long run due to leakage.
PTFE sheet gasket material comes in
several forms. The first thing that must be determined is what
type of PTFE gasket material your looking for. The first and
most common form is a virgin PTFE gasket material. Virgin PTFE is
specified for medical or electrical applications. Most applications
however are not medical or electrical and can easily be satisfied
with mechanical grade PTFE.
Mechanical grade PTFE is almost
identical to Virgin and to the naked eye is very hard to
differentiate. The difference is in mechanical grade
reprocessed PTFE has been added. Generally a very small
percentage of the material is reprocessed. The percentage will
vary however by manufacturer.
Some applications call for
thinner material. While PTFE gasket material is exceptional in
it's range of temperature (to 500 F) and PH range (0-14) it has
limitations on the thickness available. Most PTFE sheet is skived
off of a roll. Some material is molded but this is generally
limited to 24" x 24" or 12" x 12" sections.
PTFE Film is
another product that has the same or similar properties but is made
in very thin and produced in rolls. We offer PTFE Film in .001" to
.025" thick. The next size above .025" we offer is .032" which
we then term as sheet PTFE gasket material.
Expanded PTFE -
Gasket material is a soft and conformable material that is ideal for
applications with limited bolt load torque available. Or in
applications such as glass lined pipe where excessive bolt load will
cause more problems than it will solve. If you have never
touched this exceptional sealing material think of a dense
marshmallow. It has the same chemical resistance and temperature
range as any PTFE but it is soft and will effect a seal much quicker
than regular PTFE gasket material.
WHAT IS TEFLONŽ? WHAT IS PTFE?
WHAT IS TEFLONŽ?
TeflonŽ is a registered trademark of DuPont and is
used in relation to products manufactured with Duponts
What is PTFE?
PTFE stands for PolyTetraFluoroEthylene,
which is the chemical term for the polymer (CF2)n.
Polytetrafluoroethylene (PTFE), (DuPonts trademark of TeflonŽ)
is a thermoplastic member of the fluoropolymer family of plastics.
PTFE has a low coefficient of friction, excellent insulating
properties, and is chemically inert to most substances. It also can
withstand high heat applications and it is well know for its
Other trademarks, in addition to DuPonts trademark TeflonŽ, of
PTFE resin and their manufacturer are:
||AGC Chemicals Americas, Inc. (AGC). They
have plants in the U.S., England, and Japan.
||Dyneon, a 3M Company, produces PTFE resin in
Gendorf, Germany. This plant has operated since 1964, founded by
Hoechst AG and resin formerly trademarked as HOSTAFLONŽ.
||Daikin Industries Ltd. has been producing
PTFE resin since the 1960's in Japan and since 1994 in the U.S
as Daikin America Inc.
||Solvay Solexis, formerly Ausimont, has
plants in the U.S. and Italy. Ausimont was purchased by Solvay.
TEFLONŽ is a
Registered Trademarks of E.I. du Pont de Nemours and Company
Seal & Packing for your specific
PTFE Gasket Material application.