| DESCRIPTION | ELASTOMERS | FLUOROPLASTICS | ||||||
| | Neoprene | Hypalon | EPDM | Chlorobutyl | Fluoro elastomer | 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° | -51° | -40° | -40° | -51° | -79° | -79° |
| Continuous Operating Temp.C | 82° | 113° | 149° | 149° | 204° | 232° | 232° | 316° |
| Intermittent Operating Temp.C** | 121° | 121° | 177° | 177° | 288° | -- | 260° | 370° |
| (Accumulative Time in Hours) | 168 hrs. | 2600 hrs. | 200 hrs. | 150 hrs. | 240 hrs. | | 100 hrs. | 75 hrs. |
| | | 177° | | | 316° | | | |
| | | 70 hrs. | | | 48 hrs. | | | |
| | | | | | 343° | | | |
| | | | | | 16 hrs. | | | |
| | | | | | 371°* | | | |
| | | | | | 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
*Fluoroelastomers, when reinforced with non-reactive materials, have an intermittent temperature capability of 4 hours at 370°C and 2 hours at 400°C.
**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.
**** For clean air systems only. Not acceptable for flue gas applications.
Temperature Limits, Chemical Compatibility and Strength of Various Fabrics
| TYPE OF FABRIC | NYLON | POLYESTER | ARAMID | FIBERGLASS | KNITTED ALLOY WIRE |
| Temperature °C | 110° | 121° | 232°-370° | 370°-538° | 816° |
| 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 |
