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Available Materials
Chloroprene (CR)
- More commonly recognized as neoprene
and is made using chlorine and butadiene. Expansion joints
constructed using CR are very resistant to oils, greases and
many other petroleum based products. CR has excellent
ozone and weather resistance along with enhanced abrasion
and impact properties. Upper temperature limit is 250 F.
CR been utilized in power generation applications since 1960.
Ethylene Propylene (EPDM)
- A low cost, high performance
compound with excellent ozone, oxygen and chemical resis-
tance including ammonia and mild acids. EPDM can operate
at 300 F constant and has excellent low temperature resistance.
Chloronated Isobutylene Isoprene (CIIR)
- Most
commonly termed Chlorobutyl, is inherently resistant to
ozone and oxidizing chemicals including some mineral acids
and ketones. CIIR has good tensile strength, elongation,
dampening characteristics and low gas permeability. Can
operate at 300 F constant temperature.
Fluoroelastomers (FKM)
- Manufactured in the U.S.A. by
DuPont (Viton
®
) and Dyneon (Fluorel
®
). This family of
elastomers have outstanding resistance to chemicals, oils,
and heat compared other elastomers. FKM is excellent for
high acid conditions typically found from the air heater to
stack and are acceptable for use where low concentrations
of ammonia are possible due to ammonia slip (<10ppm).
400F operating and 750 F excursion.
Silicone (SL)
- Silicone has poor resistance to chemical
environments and wet conditions and should not be used
in any flue gas application. Silicone should be restricted to
hot dry applications to 500 F only.
Fluoroplastics (PTFE)
are a family of compounds that
have excellent heat and chemical resistance. Based on the
coating technique and film thickness, these materials can be
zero porosity and have the ability to resist chemical attack in
the harshest environments. Upper temperature of 575 F
constant operating.
Note: Fluoroplastics require a flow deflector in most cases and should
not be used as a stand-alone solution due to weaknesses associated
with vibration and flutter in coal-fired flue gas applications.
Viton is a registered trademark of E.I. Dupont
Fluorel is a registered trademark of 3M
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MATERIALS