As a leading manufacturer and supplier of silicone O-Rings in the UK, NES pride themselves in offering a wide range of sizes, types, and styles of O-Rings to suit virtually any application you might require.
NES manufactures encapsulated O-Rings comprising an elastomeric core, which has a seamless jacket made from fluoropolymer. The jacket can be either FEP (Fluorinated Ethylene Propylene) or PFA (Perfluoroalkoxy) with the elastomeric core being either Viton or Silicone.
The distinct advantage of having a fluoropolymer jacket over the solid PTFE O-Ring / PTFE Envelope or PTFE Coated is that PFA & FEP are not prone to cold flow and the inner core is protected from solvent ingress.
NES has total in-house control of the manufacturing process for their encapsulated seals. They extrude the inner core, outer tube, and assemble the O-ring in the same factory location, ensuring tight tolerances and reliable consistency. Their in-house extrusion control also ensures that NES produces encapsulated seals with a zero tolerance of air gaps, mitigating the risk of failure and enhancing compression set performance.
Customised Encapsulated Seals Available
We understand that every project is unique, and that’s why NES offers a wide variety of customised encapsulated O-rings.
High-Quality Materials for Optimal Performance
NES is a long-term Chemours™ licensee, using only the highest grade 100% pure materials that are not diluted with scrap material. Thier encapsulated seals are made with fluoropolymers that meet FDA, USP, 3A, EU1335, FEP/PFA/Tefzel standards. Our insistence on high-quality materials allows NES to achieve the lowest compression set on the market.
Along with Encapsulated O Rings NES is a market leader in the manufacture of hot vulcanised O-rings, offering outstanding tolerances and a joint strength of 90% of a fully moulded product.
NES understands the importance of lead times and in some instances can offer :
