Recognized as the leading supplier of perfluoroelastomer parts for over 40 years, DuPont offers a variety of high performing
products that are formulated to give the best possible seal performance in numerous aggressive environments. Excellent balance of
finished properties is achieved through careful use of proprietary polymers, cure systems, fillers and additives, resulting in superior
seals for a broad range of applications.
This Selector Guide summarizes key physical properties and attributes of the most commonly used Kalrez
®
products for the Chemical
Process Industry, providing general chemical compatibility guidance.
For more detailed information about each product, please consult the DuPont™ Kalrez® Application Guide online or contact your
DuPont regional location to request assistance from a Kalrez
®
Technical Service & Development Engineer to assess performance fit
in your specific application.
Product Selector Guide
Kalrez
®
Grades General Purpose Specialty
6375 MS220 4079 7075 7090 7275 7375 7390 6380 0040 0090
Acids
Inorganic Bases
Hydrocarbons
Solvents
Water/Steam up to 200 °C (392 °F)
Water/Steam above 200 °C (392 °F)
Amines (Organic Bases)
Vinyl or Acrylic Monomers
Silanes and Chlorosilanes
Synthetic Oils
Strong Oxidizers (e.g., Nitric Acid, O
3
, ClO
2
)
Aldehydes
Streams (unknown composition)
Pure Ethylene / Propylene Oxide
Dry Heat
High Pressure / Extrusion Resistance
RGD Resistance*
Best Suitable Not Suggested
* Rapid Gas Decompression
Depending on Pressure conditions, some Kalrez
®
grades might exhibit a suitable resistance.
Please refer to the Kalrez
®
0090 technical datasheet for RGD testing details and applicable certifications/qualifications.
DuPont
™
Kalrez
®
Perfluoroelastomer Parts
in Chemical Process Industry
Product Selector Guide
Kalrez
®
Spectrum
™
6375
Broadest Chemical Resistance
Kalrez
®
6375 parts, developed specifically for the chemical processing industry, are
designed to give outstanding performance in the widest possible range of chemicals and
temperatures.
This product is an excellent choice for use in acids, bases, amines, steam, ethylene oxide,
and many other aggressive chemicals. The curing system also allows for a maximum
service temperature of 275°C (527°F). This high temperature stability translates to increased
chemical resistance over all temperature ranges, especially if high temperature process
excursions occur. This combination of chemical and thermal resistance provides advantages
for chemical processors.
Kalrez
®
MS220
Superior Chemical Resistance
Shorter lead-time & cost-effective compound
Kalrez® MS220 perfluoroelastomer parts are designed for chemical processing and
mechanical seals applications where superior chemical resistance and low compression
set are critical for successful sealing performance.
Kalrez® MS220 continues the DuPont tradition of providing high value in use
perfluoroelastomer parts to extend equipment Mean Time Between Repair (MTBR),
while offering an excellent combination of properties (resistance to steam, acids and
bases) at temperatures up to 230 °C (446 °F).
Kalrez® MS220 parts can be a suitable alternative to Kalrez® 6375 parts in applications
where service temperatures range remain between -15 °C (5 °F) and 200 °C (392 °F).
Kalrez
®
4079
High Temperature – High Mechanical Strength
Kalrez
®
4079 parts are a low compression set product for general purpose use in O-rings,
diaphragms, seals and other parts used in the chemical process and aircraft industries.
It is a carbon black filled product with excellent chemical resistance, good mechanical
properties, and outstanding hot air aging properties. It exhibits low swell in organic acids,
inorganic acids and aldehydes, and has good response to temperature cycling effects.
A maximum service temperature of 316°C (600°F) is suggested, with short excursions to
higher temperatures possible. Kalrez
®
4079 is not recommended for use in hot water/
steam applications or in contact with certain hot aliphatic amines, ethylene oxide, or
propylene oxide.
Kalrez
®
Spectrum
™
7075
Highest Temperature Resistance - Lowest Compression Set
Kalrez
®
7075 parts are a carbon black filled product that has enhanced physical performance
properties including very low compression set and improved seal force retention.
This product is designed for improved sealing performance in both high temperature
environments and temperature cycling situations.
Kalrez
®
7075 provides even greater sealing performance in dynamic applications where
low friction is required and it was specifically developed to be used in the chemical and
hydrocarbon processing industries, with an improved thermal resistance that extends
maximum service temperature to 327°C (620°F).
Kalrez
®
7075 offers the enhanced elastomeric properties outlined above while providing
chemical resistance better than the industry standard, set by Kalrez
®
4079.
Kalrez
®
7075 is not recommended for use in hot water/steam applications; for such cases,
please use Kalrez
®
Spectrum
™
7375.
Current Kalrez
®
Product Offering
General Purpose
Kalrez
®
Spectrum
™
6375 O-rings
Kalrez® MS220 vs Kalrez® Spectrum 6375
Chemical resistance
Typical product positioning of Kalrez
®
4079
Compression Stress Relaxation of Kalrez
®
Spectrum
™
7075 in air (250 °C / 482 °F)
Specialty Products
Kalrez
®
Spectrum
™
7090
High Temperature - High Hardness
Kalrez
®
7090 parts are specifically targeted for use in applications requiring high hardness/
higher modulus properties. These specialty black parts have excellent mechanical properties
including compression set resistance, seal force retention, response to temperature cycling
effects and rapid gas decompression resistance.
Kalrez
®
7090 parts are well suited for both static and dynamic sealing applications,
especially applications that require extrusion resistance at higher temperatures. They also
offer outstanding thermal stability and chemical resistance.
Kalrez
®
7090 is not recommended for use in hot water/steam applications; for such cases,
please use Kalrez
®
Spectrum
™
7390.
A maximum service temperature of 325 °C (617 °F) is suggested. Short excursions to higher
temperatures may also be possible.
Kalrez
®
Spectrum
™
7275
Oxidizing & Reactive Chemical Environments
Kalrez
®
7275 parts are a light brown product based on a proprietary crosslinking system
targeted specifically for the chemical processing industry. It exhibits minimal swelling
and improved retention of physical properties when exposed to aggressive chemicals,
e.g., concentrated nitric acid, organosilanes, chlorosiloxanes, pure ethylene oxide,
butyraldehyde, amines and vinyl and acrylic monomers. It also has excellent compression
set resistance and good retention of physical properties after aging at high temperatures. A
maximum service temperature of 300 °C (572 °F) is suggested.
Kalrez
®
Spectrum
™
7375
High Temperature
Broad Chemical & Water/Steam resistance
Kalrez
®
7375 parts are an innovative FFKM product based on a patented crosslinking
system for chemical process industry applications where broad chemical and water/
steam resistance are needed at elevated temperatures. Kalrez
®
7375 parts exhibit excellent
compression set resistance, outstanding physical property retention, and good mechanical
strength properties. A maximum service temperature of 300 °C (572 °F) is suggested.
Kalrez
®
Spectrum
™
7390
High Temperature - High Hardness
Broad Chemical & Water/Steam Resistance
Kalrez
®
Spectrum
™
7390 perfluoroelastomer parts is a versatile FFKM product based on a
patented proprietary crosslinking system that can meet your 90 durometer (Shore A) FFKM
specifications in numerous shapes and configurations where higher mechanical strength
is needed.
Kalrez
®
Spectrum
™
7390 parts are designed to reliably seal in the most demanding chemical
and hot water/steam environments.
Thermally stable up to 300 °C (572 °F), it is an ideal fit for downstream and CPI applications
such as valves, compressors, pumps, process instrumentation and sensors as well as
mechanical seals.
Kalrez
®
Spectrum
™
7090 –
Long-Term Compression Set analysis
Kalrez
®
Spectrum
™
7275 O-rings
Kalrez
®
Spectrum
™
7375 –
Our best compound for use in hot water / steam
Product positioning –
Kalrez
®
Spectrum
™
7390 vs. competitive FFKM
Kalrez
®
Spectrum
™
6380
Strong Amines
Kalrez
®
6380 parts are a non-black product specifically developed for chemical processes
involving hot, aggressive amines. In addition, it has excellent overall chemical resistance.
This cream-colored product is easily identifiable when selecting an O-ring material for
harsh chemical plant services. This material has excellent mechanical properties and is a
top choice for both static and dynamic sealing applications.
A maximum service temperature of 225 °C (437 °F) is suggested while short-term excursions
to higher temperatures are permissible.
Kalrez
®
Spectrum
™
0040
Low Temperature
Kalrez
®
0040 parts are specifically designed for low temperature environments where
significant chemical resistance is required. Low temperature sealing performance (-42 °C /
-44 °F) typically unattainable for perfluoroelastomers parts is achievable with Kalrez
®
0040.
Kalrez
®
0040 is an excellent choice in applications such as couplings for the chemical
transportation industry or for other applications where chemical resistance and elasticity
are required in some of the coldest environments.
Kalrez
®
0090
Rapid Gas Decompression (RGD) Resistance
Kalrez
®
0090 parts deliver durable, reliable sealing solutions for applications requiring
excellent Rapid Gas Decompression (RGD) properties as well as high hardness, high modulus
properties, and excellent extrusion resistance (even without backup rings). Potential oil and
gas applications include downhole equipment such as drilling and completion tools, as well
as industrial equipment including pumps, valves and compressors.
Kalrez
®
0090 has been certified by two independent laboratories to meet rigorous
requirements for resistance to RGD.
In addition to demonstrated RGD resistance, Kalrez
®
0090 seals provide superior
performance regarding chemical and temperature properties:
• Chemical resistance:
Kalrez
®
0090 is resistant to chemicals encountered in the oil and gas industry, including
sour process streams containing H
2
S. (Reference NORSOK M-710 Rev 2 Sour Fluid aging
resistance performed by MERL (UK))
• Broad temperature capability:
Kalrez
®
0090 retains good physical properties up to temperatures as high as 250 °C (482
°F) and down to –21 °C (–5.8 °F). Under pressurized conditions, in laboratory tests, Kalrez
®
0090 has demonstrated low temperature performance down to –40 °C (–40 °F).
Kalrez
®
Spectrum
™
6380 weight change in Ethylene
Oxide (still the preferred Kalrez
®
option for Ethylene
Oxide / Water mix)
Low temperature static sealing
(DuPont Proprietary test method)
Effects of High Pressure on elastomeric O-rings
Legend:
Thermal Chemical Low Temperature Hot water and steam High Pressure / Extrusion resistance
1. O-Ring installed
3. O-Ring extruding 4. O-Ring Failure
2. O-Ring under pressure
Visit us at kalrez.com
The information set forth herein is furnished free of charge and is based on technical data that DuPont believes to be reliable and falls within the normal range of properties. It is intended for use
by persons having technical skill, at their own discretion and risk. This data should not be used to establish specication limits nor used alone as the basis of design. Handling precaution
information is given with the understanding that those using it will satisfy themselves that their particular conditions of use present no health or safety hazards. Since conditions of product use and
disposal are outside our control, we make no warranties, express or implied, and assume no liability in connection with any use of this information. As with any product, evaluation under end-use
conditions prior to specication is essential. Nothing herein is to be taken as a license to operate or a recommendation to infringe on patents.
CAUTION: Do not use in medical applications involving permanent implantation in the human body. For other medical applications,
discuss with your DuPont customer service representative and read Medical Caution Statement H-50103-3.
DuPont
™
, the DuPont Oval Logo, and all products, unless otherwise noted, denoted with ™,
sm
or ® are trademarks, service marks
or registered trademarks of afliates of DuPont de Nemours, Inc. © 2022 DuPont. All rights reserved.
Form No. KZE-A40126-00-B1122 CDP
Rev. 0, November 2022
1 DuPont proprietary test method; useful temperature range may vary with seal design and application specifics
2 ASTM D2240 (pellet test specimens unless otherwise noted)
3 ASTM D412, (dumbbell test specimens)
4 ASTM D395B, (pellet test specimens)
5 Modulus at 50% elongation
6 ASTM D395B & D1414 (AS568 K214 O-ring test specimens)
* Not to be used for specification purposes
Kalrez
®
grade Color
Service Temperature
1
Shore A
hardness
2
Modulus
at 100%
elongation
3
Tensile
Strength
3
Elongation at
Break
3
Compression
Set
4
70 hours
204 °C (400 °F)
Lowest Maximum
6375 Black
-20 °C
(-4 °F)
275 °C
(527 °F)
75
9.1 Mpa
(1320 psi)
15.2 Mpa
(2200 psi)
160% 24%
MS220 Black
-14 °C
(7 °F)
230 °C
(446 °F)
76
6.9 Mpa
(1010 psi)
15.9 Mpa
(2310 psi)
154% 24%
4079 Black
-19 °C
(-2 °F)
316 °C
(601 °F)
75
7.2 Mpa
(1050 psi)
16.9 Mpa
(2450 psi)
150% 14%
7075 Black
-18 °C
(0 °F)
327 °C
(621 °F)
75
11.2 Mpa
(1630 psi)
17.2 Mpa
(2500 psi)
138% 10%
7090 Black
-26 °C
(-15 °F)
325 °C
(617 °F)
90
14.1 Mpa
(2050 psi)
13.7 Mpa
(1980 psi)
52% 12%
7275 Light Brown
-20 °C
(-4 °F)
300 °C
(572 °F)
75
9.7 Mpa
(1410 psi)
14.5 Mpa
(2100 psi)
160% 22%
6
7375 Black
-20 °C
(-4 °F)
300 °C
(572 °F)
77
15.2 Mpa
(2200 psi)
20.0 Mpa
(2900 psi)
115% 9%
6
7390 Black
-22 °C
(-8 °F)
300 °C
(572 °F)
89
21.3 Mpa
(3090 psi)
22.1 Mpa
(3210 psi)
101% 14%
6
6380 Cream
-22 °C
(-8 °F)
225 °C
(437 °F)
80
6.9 Mpa
(1000 psi)
15.9 Mpa
(2300 psi)
160% 42%
0040 Black
-42 °C
(-44 °F)
220 °C
(428 °F)
70
5.2 Mpa
(750 psi)
9.0 Mpa
(1300 psi)
170% 42%
0090 Black
-27 °C
(-17 °F)
250 °C
(482 °F)
95
14.2 Mpa
5
(2060 psi)
5
19.5 Mpa
(2830 psi)
80% 19%
Typical Physical Properties*
