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Technical Information
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® ™
Kalrez Spectrum 6375
Product Overview
®
For over 25 years, Kalrez parts have been the sealing material of choice for long-term reliable
sealing in the harshest chemical environments. Today, elastomeric seals are expected to perform in a
variety of even more aggressive chemicals and at higher temperatures. To meet the needs of
chemical processors, DuPont Performance Elastomers has developed a product that expands on the
capabilities of existing Kalrez® parts with broader chemical resistance while maintaining the high
temperature stability you’ve come to expect from Kalrez®.
® ™
Kalrez Spectrum 6375
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® ™ Typical Physical Properties
Kalrez Spectrum 6375, designed specifically
for the chemical process industry, combines 2
Hardness , Shore A 75
innovative polymer and cure technology to give 3
100% Modulus , MPa (psi) 7.24 (1050)
outstanding performance in the widest possible 3
range of chemicals and temperatures. This Tensile at Break , MPa (psi) 15.16 (2200)
3
product is an excellent choice for use in acids, Elongation at Break , % 160
4
bases, amines, steam, ethylene oxide, and Compression Set , % 30
many other aggressive chemicals. Mixed 70 hr at 204°C (400°F)
5
streams, once a problem for many chemical Maximum Service Temperature ,
processors, can now be handled by compound °C (°F) 275 (527)
1
6375. The curing system also allows for a Not to be used for specifications
2 ASTM D2240 (pellet test specimen)
continuous upper service temperature of 275°C 3
ASTM D412, 500 mm/min (dumbbell test specimen)
(527°F). This is approximately 100°F higher than 4 ASTM D395B (AS568 K214 O-ring test specimen)
other products claiming broad chemical 5 DuPont Performance Elastomers proprietary test method
resistance. 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. Today, chemical
processors use several perfluoroelastomer parts, including compounds 4079, 1050LF, and 2035, to
optimize chemical and thermal performance. Kalrez® Spectrum™ 6375 may be used in many
applications to displace these products.
However, if optimum chemical resistance is required, then applications must be inpidually reviewed
for the optimum compound selection.
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Chemical Resistance to: Kalrez 6375 Kalrez 4079 Kalrez 2035 Kalrez 1050LF
Aromatic/Aliphatic oils ++++ ++++ ++++ ++++
Acids ++++ ++++ ++++ +++
Bases ++++ +++ +++ ++++
Alcohols ++++ ++++ ++++ ++++
Aldehydes ++++ +++ ++++ ++++
Amines +++ + ++ ++++
Ethers ++++ ++++ ++++ ++++
Esters ++++ ++++ ++++ ++++
Ketones ++++ ++++ ++++ ++++
Steam/Hot water ++++ + +++ +++
Strong Oxidizers ++ ++ ++ ++
Ethylene Oxide ++++ x ++++ x
Hot Air +++ ++++ ++ +++
++++ = Excellent +++ = Very Good ++ = Good + = Fair x= Not Recommended
Chemical Resistance
For many applications, low volume swell of elastomers is critical to proper operation of equipment.
Excessive swell may cause permanent seal failure due to equipment hangup, extrusion, etc. The
following data is the result of lab testing to determine the volume swell of Kalrez® Spectrum™ 6375
when exposed to various fluids. Other physical property testing is needed to further define product
performance; however, volume swell is an excellent predictor of performance. The following
chemicals were chosen since they are representative of some of the most aggressive applications in
the industry. These test results are an indication of the performance of compound 6375; however, all
applications are unique, and it is strongly recommended that immersion testing be performed in the
actual process fluids.
® ™
Temperature Kalrez Spectrum 6375 Nearest
Chemical °C (°F) Rating Competitive FFKM
Water 225 (437) A C
Glacial acetic acid 100 (212) A A
Nitric acid (70%) 85 (185) B C
Sulfuric acid (98%) 150 (302) A C
Maleic acid 90 (194) A B
Ammonium hydroxide 100 (212) B B
Ethylene oxide 50 (122) A A
Urea 175 (347) A B
Epichlorohydrin 100 (212) A A
Butyraldehyde 70 (158) A B
Toluene diisocyanate 100 (212) A B
HCFC 134a 25 (77) A A
Exposure time = 672 hr.
Rating system:
A: 0–10% volume swell
B: 10–20% volume swell
C: >20% volume swell
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Thermal Resistance
® ™
Kalrez Spectrum 6375 has excellent heat resistance to go along with the outstanding chemical
resistance. Innovative curing technology allows this compound to have a continuous use service
temperature of 275°C (527°F). This results in the best combination of chemical resistance and
thermal resistance of any elastomer on the market today. One method of predicting heat resistance is
compression set. This is defined as: the amount by which a standard test piece (typically an O-ring or
pellet) fails to return to its original thickness after being subjected to a standard compressive load or
deflection for a fixed period of time. The following charts shows some elastomer comparisons with
regard to compression set resistance.
Compression Set vs.Time at 204°C (400°F)
Compression Set vs.Time at 260°C (500°F)
The information set forth herein is furnished free of charge and is based on technical data that DuPont Performance Elastomers believes to be
reliable. It is intended for use by persons having technical skill, at their own discretion and risk. 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 of our control, we make no warranties, express or implied, and assume no liability in
connection with any use of 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 or a recommendation to infringe on any patents. CAUTION: Do not use in medical applications involving permanent implantation in the human body. For other medical applications, discuss with
your DuPont Performance Elastomers customer service representative and read Medical Caution Statement H-69237.
™
DuPont is a trademark of DuPont and its affiliates.
® ® ™
Kalrez and Kalrez Spectrum are trademarks or registered trademarks of DuPont Performance Elastomers.
Copyright © 2005 DuPont Performance Elastomers L.L.C. All rights reserved.
(10/99) Printed in U.S.A.
Reorder no: H-82112-01
