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TABLE I: PROPERTIES OF ELASTOMERS AND FLUOROPLASTICS

DESCRIPTION ELASTOMERS FLUOROPLASTICS
  Neoprene Hypalon EPDM Chlorobutyl Fluoroelastomer Silicone Fluoro Ethyllene Propylene Poly Tetra Fluoro Ethylene
ASTM Designations (CR) (CSM) (EPDM) (CIIR) (FKM) (SL)⁺⁺ (FEP) (PTFE)
I. Material Temperature    
Minimum Low Temp. Brittle Point -40 -40 -60 -40 -40 -60 -110 -110
Continuous Operating Temp. 180 235 300 300 400 450 450 600
Intermittent Operating Temp.** 250 250 350 350 550 -- 500 700
(Accumulative Time in Hours) 168 hrs. 2600 hrs. 200 hrs. 150 hrs. 240 hrs.   100 hrs. 75 hrs.
    350     600      
    70 hrs.      48 hrs.      
          650      
          16 hrs.      
          700*      
          4 hrs.      
II. Chemical Resistance      
H₂SO₄ Acid Hot < 50% Concentration B-C A A A A C A A
H₂SO₄ Acid Hot > 50% Concentration C B B-C B-C A C A A
HCL Acid Hot < 20% Concentration C B B B A C A A
HCL Acid Hot > 20% Concentration C C C C A-B C A A
Anhydrous Ammonia A B A A C C A A
NAOH < 20% A A A A A A A A
NAOH > 20% A A A A B B A A
III. Abrasion Resistance A A A A A C C C
IV. Environmental Resistance                
Ozone B A A A A A A A
Oxidation B A A A A A A A
Sunlight B A A A A A A A
Radiation*** A A A C B B C C

Rating Code:   A= little or no effect   B= minor or moderate effect   C= severe effects

⁺⁺ For clean air systems only. Not acceptable for flue gas applications.
*Fluoroelastomers, when reinforced with non-reactive materials, have an intermittent temperature capability of 4 hours at 700F and 2 hours at 750F.
**Excursions at high temperatures will have a detrimental effect on the useful life of the product.
***Any nuclear application should be referred to expansion joint manufacturer for specific elastomer recommendation.

TABLE II: TEMPERATURE LIMITS, CHEMICAL COMPATIBILITY, AND STRENGTH OF VARIOUS FABRICS

TYPE OF FABRIC NYLON POLYESTER ARAMID FIBERGLASS KNITTED ALLOY WIRE
Temperature F 230 250 450-700 700-1000 1500
Dilute Sulfuric Acid Good Good Good Very Good Excellent
Concentrated Sulfuric Acid Poor Fair Poor Good Excellent
SO₂, SO₃ Good Good Good Very Good Excellent
Tensile Strength Fair Poor Excellent Very Good Fair
Retained Strength Good Fair Good Fair Excellent