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PTFE Gasket Material

PTFE Gasketing

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

PTFE Gasketing

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.

PTFE Gasketing

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.

PTFE Gasketing

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 - EPTFE 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.

PTFE Gasketing


TeflonŽ is a registered trademark of DuPont and is used in relation to products manufactured with Dupont’s fluoropolymer resins.

What is PTFE?
PTFE stands for PolyTetraFluoroEthylene, which is the chemical term for the polymer (CF2)n.

Polytetrafluoroethylene (PTFE), (DuPont’s 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 anti-stick properties.

Other trademarks, in addition to DuPont’s trademark TeflonŽ, of PTFE resin and their manufacturer are:

FLUONŽ AGC Chemicals Americas, Inc. (AGC). They have plants in the U.S., England, and Japan.
DYNEONŽ 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.
POLYFLONŽ 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.
ALGOFLONŽ 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

 Consult American Seal & Packing for your specific PTFE Gasket Material application.


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