National Plastics & Seals Inc.
Distributes plastic sheet, rod, and tube, O-rings, packing seals, heat shrinkable tubing, and machined plastic parts.
http://www.nationalplastics.com/

Hallite Seals International
Hallite are an ISO accredited manufacturer of Hydraulic Seals - Piston, Rod, Gland, Wiper Seals, Bearings, Back-Up & O-Rings, Seal Kits, Single and Double Acting piston seals, excluder seal, Manufactured from PTFE, polyurethane, nitrile, NBR, AU, FKM
http://www.hallite.co.uk

Oil Seal Entersprise Ltd.
Manufacturer of rubber products (silicone, epdm, neoprene, silicone and teflon) including clamps, o rings and seals (oil, shaft, wiper).
http://www.jenp.com.tw/

Semiplas Security Seals
Manufacturer of plastic and metal tamper evident security seals. Based in Turkey.
http://www.semiplas.com

Harwal Oil Seals
Perhaps one of the largest selections of seals on the entire internet, große Auswahl der hydraulischen Dichtungen, selección grande hidráulicos de sellos
http://www.harwal.com

Facdem
scellé de sécurité, scellés plastiques, scellés métalliques, scellés containers, plombs, sécurité, fermeture, liens, colliers, pinces, pliers, attaches, identification, fixation, agrafe, crochet, plaque, plaquette, étiquette, marquage, gravage, moule, fil perlé, électricité, transport, anti-fraude, fixation, industrie, usinage plastique, composite, plastique, thermoplastique, usinage, fraisage, tournage, prototype, seal, plastic,security,ties,marking,collar,lead seal,label,plastic,PE,PET,PA,PA6,POM,PC,Polyethylene,ertalon,ertacetal,ertalyte,nylatron
http://www.facdem.com/AnglaisDefault.htm

Qualiseal Technology
Qualiseal Technology designs and manufactures custom mechanical seals for the aerospace industry and others that require unusual sealing performance with challenging parameters.
http://www.qualiseal.com/

Leak-Proof Engineering Pvt Ltd.
Manufacturer of various mechanical seals including metal bellow seals, multiple coil spring seals and rubber bellow seals. Full line of braided packings also available.
http://www.leakproofseals.com

Ashton Seals Ltd.
Supplier of bonded seals, "O" rings, filter seals and oil seals.
http://www.ashtonseals.com

Presray Pneuma-Seal
Inflatable seals can solve many engineering problems. Doors and other closures can be positively sealed by using inflatable seals. When inflated, an inflatable clamp provides uniform controlled pressure. An inflatable actuator exerts pressure to actuate switching devices.
http://www.pneuma-seal.com/