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| Tradename | Material | Manufacturer |
| Ocean Enplex | ABS/PVC | Ocean Plastics Ltd. |
| Octa | LCP | Dainippon Ink & Chemicals |
| Oilon | Cast PA | Nylacast |
| Okirol-EF | EPS | Dioki Organska Petrokemija |
| Okiten | LDPE | Dioki Organska Petrokemija |
| Okulen | UHMWPE, HMWPE | Dioki Organska Petrokemija |
| Oleflex | TPO | Riken Technos |
| Oleform | PP | Chisso |
| Olehard | PP | Chisso |
| Olesafe | PP | Chisso |
| Oltpur | PUR | Oltchim |
| Oltvil | S-PVC | Oltchim |
| Omay | PC film, PC sheet | Suzhou Omay Optical Material Ltd. |
| Omercon | PAni | Zipperling Kessler & Co. |
| Omikron | PP | Tecnopol s.p.a. |
| Omsky | SBR | Omsk |
| Omyafoam | PUR | Omya GmbH |
| Omycarb | PVC | Omya GmbH |
| Omyalene | PP | Omya GmbH |
| Omyalite | PVC | Omya GmbH |
| OnFlex-V | TPE-V | PolyOne |
| Ongro | CPE | Borsodchem RT |
| Ongrovil | PVC | Borsodchem RT |
| Onlymide | PAI | Kolon Industries |
| Ontex | TPE | Solvay Engineering Polymers |
| Oppanol IBS | TPE | BASF |
| OPPalyte | Oriented PP film | ExxonMobil Chemical |
| Optamid | PA | G. Schwartz GmbH + Co KG |
| Optema | EMA copolymer | ExxonMobil Chemical |
| Optic | Biaxially oriented PP film | Poly Pacific Pty Ltd |
| Optiflex | Clear TPE | Star Thermoplastic Alloys & Rubbers |
| Optimax | PC | Polymer Options LLC |
| Optimide | LCP | Optatech |
| Optimum | Copolyester | Rauh Polymers |
| Optix | PMMA | Plaskolite |
| Optum | PP alloy | Ferro |
| Orbilan | UHMWPE | Orbilan Kunststoffwerk GmbH |
| Orevac | Grafted PP, PE | Arkema Group |
| Orgalloy | PA alloys | Arkema Group |
| Orientene | PP | Oriental Petrochemicals Company |
| Orkot | Polyester thermoset | Trelleborg Sealing Solutions |
| Orlon | Acrylic fiber | DuPont |
| Ormecon | PAni | Zipperling Kessler & Co. |
| Oroglas | PMMA | Arkema Group |
| Oromid | PA | Rhodia |
| Orsoft | Polyethers | Orsa Foam S.p.A. |
| Osakryl | Vinyl | Firma Chemiczna Dwory |
| Osstyrol | ABS, ASA, HDPE, PP sheet | Hagedorn AG |
| Overflex | TPE | Star Thermoplastic Alloys & Rubbers |
| Owipian | EPS | Firma Chemiczna Dwory |
| Owispol | PS | Firma Chemiczna Dwory |
| Oxnilon | PA 6, PA 66 | Oxford Polymers |
| Oxy | Vinyl | Occidental |
| Oxyblend | Vinyl | Occidental |
| Oxyclear | PVC | Occidental |
| OxiShield | EVOH film | Honeywell Specialty Films |
| OxyVinyl | PVC | Occidental |
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