Teflon™ FEPD 121
Fluoroplastic Resin

FEP Aqueous Dispersion

Product Information
Product Description

Processing

Teﬂon FEPD 121 is an off-white aqueous fluorinatedethylene propylene (FEP) dispersion stabilized with anon-ionic surfactant. It is a general-purpose dispersion
that can be used to impart some the unique properties ofFEP to end products that would be difficult to make using
traditional melt extrusion processes. It can be used to coator impregnate porous structures, or to make thin films. It canbe coated and melt bonded to polytetrafluoroethylene (PTFE)
resin or used as a hot melt adhesive.

Conventional dip or ﬂow techniques can be used for coating
or impregnating high temperature fabrics, fibers, and otherproducts with Teﬂon™ FEPD 121. A FEP resin coating on
woven fabrics made of fiberglass, Nomex® aramid ﬁber,Kevlar® aramid ﬁber, or other high-temperature resistantﬁbers, can be made by dip coating. Successive passes may
be necessary to build the desired thickness to produce asmooth, crack-free coating. Each coating layer is usually
dried to remove water (typically at 120 °C [250 °F]), baked
to remove the wetting agent (typically at 270 °C [518 °F]),
and then heated above the crystalline melting point of theresin particles (approximately 265 °C [509 °F]). If the Teﬂon™
FEPD 121 is being used as a top coat over a PTFE-coatedfabric or other parts, the coating must be heated to melt thePTFE (approximately 337 °C [639 °F]) to maximize adhesion.

™

The FEP resin in Teﬂon™ FEPD 121 is a melt flowable
thermoplastic, providing superior properties typical offluoroplastic resins: retention of properties after service at
204 °C (400 °F) and useful properties at –240 °C (–400 °F).
Teﬂon™ FEPD 121 aqueous dispersion provides:• Inertness to nearly all industrial chemicals and solvents• Stability at high temperatures• Excellent dielectric properties• Excellent weatherability

Typical Applications• Heat-sealable top coatings for PTFE-coated fabrics forbelting, circuit boards, architectural fabrics, and electricalinsulation• Cast film for capacitor dielectrics or chemical barriers• Hot melt adhesive for PTFE, PFA, and FEP parts• Metal coatings

Food Contact ComplianceProperly processed products (sintered at high temperaturescommon to the industry) made from Teﬂon™ FEPD 121 resin
can qualify for use in contact with food in compliance withFDA 21 CFR 177.1550 and European Regulation (EU) No.
10/2011. For details and information, please contact yourChemours sales representative.

Other solid or liquid ingredients can be added to Teﬂon™ FEPD
121 to provide speciﬁc processing or ﬁnished product behavior.

Safety Precautions
Before processing any fluoroplastics, read the Material
Safety Data Sheet, available upon request from ourCustomer Service Group at (844) 773-CHEM/2436 in theU.S. or (302) 773-1000 outside of the U.S. Also read thedetailed information in the latest edition of the “Guide tothe Safe Handling of Fluoropolymer Resins,” published by
the Fluoropolymers Division of The Society of the Plastics
Industry (www.fluoropolymers.org) or by PlasticsEurope(www.plasticseurope.org).

Storage and HandlingTeﬂon™ FEPD 121 must be properly stored to maximize
the stability of the dispersion. The FEP particles will
settle on prolonged standing and/or on prolonged heating;temperatures above 40 °C (104 °F) should be avoided. Thedispersion must be protected from freezing, which will cause
irreversible settling. The optimum storage temperature range
is 7–24 °C (45–75 °F). If dispersions are to be stored forextended periods, lower-temperature storage is desirable.

Teflon™ FEPD 121

Fluoroplastic Resin

For optimal performance, Teﬂon™ FEPD 121 should be gently
mixed or rolled monthly and prior to use.

Storage and handling areas should be clean. Keep dispersion
drums closed and clean to avoid both contamination andcoagulation by drying at the liquid surface. High processingtemperatures will cause even very small foreign particles tobecome visible or to make defects in ﬁnished products. Goodhousekeeping and careful handling are essential.

Ammonium hydroxide is used by Chemours to set the pH to
9.5-11.0 at the time of shipment. High ambient temperatures
can deplete the ammonium hydroxide level and reduce thepH. Declining pH eventually favors bacterial growth, whichcauses odor and scum. The pH of opened containers shouldbe measured and maintained between 9.5 and 11.0.
High-speed stirring, pumping, or any other violent agitation
should be minimized to prevent coagulation and to minimize
foaming. Ideally, the dispersion should be conveyed by gravity
from storage to processing stations.

PackagingTeﬂon™ FEPD 121 is packaged in 114-L (30-gal)
non-returnable drums and 1,000-L (264-gal) recyclable
containers.

Table 1: Typical Property Data for Teflon™ FEPD 121 Fluoroplastic Resin
Property

Test Method1

Unit

Typical Value

Solids Content (% FEP by weight)

ASTM D4441-04

ISO 12086%

55% Surfactant based on FEP solids

ASTM D4441-04

ISO 12086%

Density of Dispersion (at 55% solids)

ASTM D4441-04

ISO 12086

g/cm

1.41Chemoursµm0.18

Dispersion Particle Size, average diameter
pH of Dispersion

ASTM E 70

5.53ISO 1148

10Brookfield Viscosity (at 25 °C [77 °F])

ASTM D2196

ISO 2555

MPa·s

25

Melting Temperature

ASTM D2116

ISO 12086°C (°F)

260 (500)

Melt Flow Rate (MFR 372/5.0)

ASTM D2116

ISO 12086

g/10 min8

Typical properties are not suitable for specification purposes.

HOW TO USE THE TEFLON™ BRAND NAME WITH YOUR PRODUCTTeflon™ is a registered trademark of Chemours for its brand of fluoroplastic resins, coatings, films, and dispersions. The Teflon™ brand name is licensed by Chemours in association with approved applications.
Without a trademark license, customers may not identify their product with the Teflon™ brand name, as Chemours does not sell such offerings with the Teflon™ trademark. Unlicensed customers may refer tothe Chemours product offering with only the Chemours name and product code number descriptor as Chemours sells its product offerings. There are no fair use rights or exhaustion of rights to use the Teflon™
trademark from buying from Chemours, a Chemours customer, or a distributor without a trademark license from Chemours.
If you are interested in applying for a trademark licensing agreement for the Teflon™ brand, please visit www.teflon.com/license
CAUTION: Do not use or resell Chemours™ materials in medical applications involving implantation in the human body or contact with internal body fluids or tissues unless agreed to by Seller in a writtenagreement covering such use. For further information, please contact your Chemours representative. For medical emergencies, spills, or other critical situations, call (866) 595-1473 within the UnitedStates. For those outside of the United States, call (302) 773-2000.
The information set forth herein is furnished free of charge and based on technical data that Chemours believes to be reliable. It is intended for use by persons having technical skill, at their own
discretion and risk. The handling precaution information contained herein is given with the understanding that those using it will satisfy themselves that their particular conditions of use present
no health or safety hazards. Because conditions of product use are outside our control, Chemours makes no warranties, express or implied, and assumes no liability in connection with any useof this information. As with any material, evaluation of any compound under end-use conditions prior to specification is essential. Nothing herein is to be taken as a license to operate under or arecommendation to infringe any patents.
NO PART OF THIS MATERIAL MAY BE REPRODUCED, STORED IN A RETRIEVAL SYSTEM OR TRANSMITTED IN ANY FORM OR BY ANY MEANS ELECTRONIC, MECHANICAL, PHOTOCOPYING, RECORDING OR OTHERWISEWITHOUT THE PRIOR WRITTEN PERMISSION OF CHEMOURS.

For more information, visit teflon.com/industrial
For sales and technical support contacts, visit teflon.com/industrialglobalsupport© 2020 The Chemours Company FC, LLC. Teflon™ and any associated logos are trademarks or copyrights of The Chemours Company FC, LLC. Chemours™ and the Chemours Logo aretrademarks of The Chemours Company.
Nomex® and Kevlar® are registered trademarks of E.I. du Pont de Nemours and Company or its affiliates.
Replaces: K-25402
C-10097 (3/20)