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| FEP envelope silicone O-rings are made of special heat resistant rubber coated by fluoride plastic with unique manufacture technique. Therefore,they possess the characteristic of low permanent deformation rate given by rubber O-rings,along with the special features endowed by fluoride plastic such as resisting heat,cold,oil,rub,climate changersand chemical corrosion. |
| Encapsulated teflon o rings, include FEP/PFA coatiing with Silicone/FKM o rings. Polytetra fluoroe thylene o rings. The thickness of coating is 0.2mm. |
| ORIGINAL PROPERTIES | A PFA+FKM | B FEP+FKM | C FEP+Silicone | D PFA+silcione | ||
| HARDNESS SHORE A | 70~90 | 70~90 | 60~75 | 60~75 | ||
| TENSILE STRENGTH,MPa, MIN | 16 | 16 | 16 | 16 | ||
| ELONGATION, %, MIN | 60 | 60 | 80 | 80 | ||
| COMPRESSION RATE, % | 50~60 | 50~60 | 60~75 | 60~75 | ||
| COMPRESSION SET, MAX, % | 10 | 10 | 20 | 20 | ||
| HEAT RESISTANCE 24H . AT 230°C | ||||||
| CHANGE IN HARDNESS, POINTS | -5~+5 | -5~+5 | -5~+5 | -5~+5 | ||
| CHANGE IN TENSILES STRENGTH, % | -15 | -15 | -15 | -15 | ||
| CHANGE IN ULTIMATE ELONGATION, % | -20 | -20 | -20 | -20 | ||
| COMPRESSION SET, MAX, 70H AT 175°C | ≤20 | ≤20 | ≤30 | ≤30 | ||
| COLLOR | BROWN | BLACK | RED | RED | ||
| Suggestion Working Condition | ||||||
| Working temperature °C | -20~250 | -20~200 | -50~200 | -50~250 | ||
| Working pressure MPa | 0~35 | |||||
| Working Medium: All medium except for the Elemental fluorine and molten sodium metal. | ||||||
Encapsulated seals are available with two types of Teflon® jacket - FEP which is standard, and PFA for more demanding applications.
The energising core is available in Viton®, Silicone or EPDM. Viton® is offered as the standard because of its superior compression set. For low-temperature applications, or where lower closure forces are required either a solid Silicone or hollow Silicone core is specified
