Isolast® J9503 grade of perfluoroelastomer material from Busak+Shamban proved to be an outright winner in independent tests undertaken by a major chemical manufacturer to find the best performingperfluoroelastomer from a range of FFKM materials.
Perfluoroelastomers were developed to meet the needs of chemical processing companies for sealing materials that have the elasticity of a Fluoroelastomer but the chemical resistance of a PTFE
material. A major chemical manufacturing company had a number of formulations to choose from and undertook independent tests to identify the material that offered the best performance.
The Isolast® range of materials are perfluoroelastomers specifically developed by Busak+Shamban for the manufacture of seals. They are resistant to virtually all chemicals, have operating
temperatures up to 325°C (617°F) and a low, long-term compression set.
Included in the tests by the chemical company were Isolast® J8325 and Isolast® J9503.
Isolast® J8325 material is specially engineered to withstand very high thermal stresses with a continuous operating temperature up to 325°C (617°F).
Isolast® J9503 has a resistance to virtually all media including hot amines, other nucleophiles, live steam up to 240°C (464°F), ethylene and propylene oxide, esters, ketones, strong acids and
Pictured are Isolast® O-Rings
The chemical company’s tests involved keeping the Isolast® materials and other competitive FFKM compounds immersed in a number of extremely aggressive chemical media for 112 days at varying temperatures. After this time, the material volume was measured. A volume increase of 20% is classed as ‘critical threshold value’ for seals in this type of experiment. Beyond that, the sealing material would not be considered suitable for sealing in a chemical media, at the temperatures where a volume change of over 20% occurred.
Tests were in the following media and temperature ranges:
- Hot aniline up to 184°C (363°F)
- Nitrotoluene up to 175°C (347°F)
- O-dichlorobenzene (ODCB) up to 180°C (356°F)
- Ethylene diamine (EDA) up to 100°C (212°F)
- Chlorosulfonic acid (CSS RT)
- 20% solution of hydrochloric acid up to 108°C (226°F)
- Sulfuric acid and sulfuric acid compounds at a solution up to 87% up to 175°C (347°F)
- 65% nitric acid at between 50°C (122°F) and 122°C (252°F)
- Hot air at 180°C (356°F)
Summary of results was as follows:
- Isolast® J9503 had the lowest volume change of all perfluoroelastomer tested in all chemicals
- Volume change of Isolast® J8325 and Isolast® J9503 was below 20% at all temperatures in aniline, nitrotoluene, o-dichlorobenzene, chlorosulfonic acid, hydrochloric acid, nitric acid
- In many of these chemicals the volume change of Isolast® J8325 and Isolast® J9503 was in fact, below 10%
- Isolast® J8325 and Isolast® J9503 had the widest chemical resistance of all perfluoroelastomers tested
- Isolast® J8325 showed a volume change of more than 20% in only one chemical, ethylene diamine but in this media, volume change was below 20% for Isolast® J9503
Isolast® J9503 has become the standard to which the chemical company test their perfluoroelastomers before they are specified for use in their processing plants. Compared to other perfluoroelastomers, Isolast® J8325 and Isolast® J9503, proved to be the best value, comparing cost to performance.