Encapsulated O-rings solves sealing problems in the aggressive fluids industry. They’re composed by 2 parts: a cover in FEP (Fluorine-Ethylene-Propylene) or PFA (PerfluoroAlcoxy) and an elastomeric core that could be in silicon, FKM (Viton®) or EPDM.
These two parts combined have the chemical resistance of the fluoroplastic materials and the elasticity of the elastomeric core; the cover grant protection from chemical agents and the internal part consent elastic memory.
ELASTOMERIC INTERNAL O-RING
The elastomeric materials used in the O-Rings are:
The FKM (Viton®) have a better “compression set” rate while the silicon solution is better for the low temperatures application or for the food / pharmaceutical industry; the EPDM is used only for special applications on customer request.
The cover could be in FEP or PFA, both of these materials applies to these regulations:
- FDA 21CFR. 177.1550
- EC 1935/2004 - UE 10/2011
- 3A Sanitary Standard
- USP Class VI <87> & <88>
FEP is the standard choice while PFA finds his application on higher temperatures.
- combination SILICON/FEP : -60°C / + 200°C
- combination VITON /FEP : - 20°C /+ 204°C
- combination SILICON/PFA: - 60°C / + 260°C
- combination VITON /PFA : -20°C/+204°C
- Great thermal resistance and chemical compatibility
- Good strain and compression resistance
- No joints on FEP/PFA covering
- Non contamination for food/pharmaceutical industry
- Smooth and non-adherent surface
- Low steam permeability
- Sections from 1,60 from 20,00 mm
- No mold or equipment costs