Product Bulletin P-14

D520CS/521CS,
D2020CS/2021CS
Ion Exchange Materials

Polymer Dispersions
Product Information
Nafion™ perfluorosulfonic acid (PFSA) polymer
dispersions are made from chemically stabilized PFSA/
polytetrafluoroethylene (PTFE) copolymer in the acid(H+) form and are available in several polymer content

and dispersant compositions. Typical uses include
fabrication of thin films, coating formulations for fuel cell
membranes, catalyst coatings, sensors, and a variety ofelectrochemical applications.

Typical Composition
Nafion™ PFSA Polymer Dispersions by Composition
Property

D520CS

D521CS

D2020CSD2021CS

Polymer Content, wt%

5.0 min.
5.4 max.

5.0 min.
5.4 max.

20.0 min.
22.0 max.

20.0 min.
22.0 max.

Water Content, wt%

45 ± 345 ± 334 ± 234 ± 2VOC Content, wt%

50 ± 350 ± 346 ± 246 ± 248 ± 348 ± 344 ± 244 ± 2Ethanol<4<4<2<2Mixed Ethers and Other VOCs

<1<1<1<1

0.92−0.94

0.92−0.94

1.01−1.03

1.01−1.03

>1.00

>0.92

>1.00

>0.92

1.03−1.12

0.95−1.03

1.03−1.12

0.95−1.03

10−40

10−40

50−50050−5001-Propanol

Specific Gravity
Available Acid Capacity, meq/g,
H+ polymer basis
Total Acid Capacity, meq/g,
H+ polymer basis
Viscosity, cP, at 25 °C (77 °F) and40 sec–1 Shear Rate**1 cP = 1 MPa·sec

Nafion™

Ion Exchange Materials

Order Information

Handling Practices

Dispersions are available in the following containers(4-L minimum order):Ventilation should be provided for safe handling andprocessing of Nafion™ dispersion. The amount of local
exhaust necessary for processing Nafion™ dispersion
at elevated temperatures will depend on the combined
factors of dispersion quantity, temperature, and exposure
time. Adequately ground both supply and receiving
containers before dispensing dispersions containing
flammable solvents.

• 4-L container package (air or land delivery)• 20-L container (air or land delivery)• 190-L drum (land delivery)
Safe Handling and Use of Nafion™ PFSA Polymer
Dispersions
The following information should be reviewed before
handling and processing Nafion™ PFSA polymer
dispersions:• Safety Data Sheets (SDSs) for Nafion™ PFSA polymer
dispersions D520CS/521CS and D2020CS/2021CS• Nafion™ “Safety in Handling and Use” technical bulletin,
T-01• “Guide to Safe Handling of Fluoropolymer Resins,”
Fourth Edition, November 2005, Published by theFluoropolymers Division of the Society of the Plastics
Industry, Inc.
Prior to each use, D520CS, D521CS, D2020CS, andD2021CS dispersions should be stirred or otherwise
mixed while in the original shipping container anddispensed through a 10 µm filter. Any dispersion notintended for immediate use should remain in its original
shipping container, and the exposure time to theatmosphere minimized.

Disposal
Refer to the SDS for Nafion™ dispersion. Treatment,storage, transportation, and disposal must be inaccordance with applicable federal, state/provincial, andlocal regulations.
Recommended Storage Conditions
For long-term storage, store in sealed glass, plastic, or
stainless-steel containers only between 0 °C (32 °F) and32 °C (90 °F) for D520CS, D521CS, D2020CS, andD2021CS. Store in a dry environment, away from direct
sunlight, ideally in a temperature-controlled room. Not tobe frozen.
Expected Shelf Life
Under our recommended storage and use conditions,a shelf life of two years is expected from the date ofpackaging into the shipping container. The date ofpackaging will be indicated on a label affixed to theproduct container.

The data listed here fall within the normal range of product properties, but they should not be used to establish specification limits nor used alone as the basis of design. This information is based ontechnical data that Chemours believes to be reliable. It is intended for use by persons having technical skill and at their own discretion and risk. This information is given with the understanding that thoseusing 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 obligation or liability in connection with any use of this information or for results obtained in reliance thereon. The disclosure of the information is not a license tooperate under or a recommendation to infringe any patent of Chemours or others.
Medical Statement: Please contact your Chemours representative to discuss limitations regarding medical applications.

For more information about Nafion™, contact:The Chemours Company
Global Customer Service for IXM
22828 NC Highway 87 W
Fayetteville, NC 28306, USATelephone USA: (800) 283-2493
Fax: (302) 861-3736
Email: customerservice.nafion@chemours.com
Web: chemours.com/Nafion© 2020 The Chemours Company FC, LLC. Nafion™ and any associated logos are trademarks or copyrights of The Chemours Company FC, LLC. Chemours™ and the Chemours Logo aretrademarks of The Chemours Company.
Replaces: K-24294
C-10606 (4/20)