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| Tradename | Material | Manufacturer |
| Label-Lyte | Oriented PP film | ExxonMobil Chemical |
| Lacea | PLA (biodegradable polymer) | Mitsui Chemicals |
| Lactel | PLA (biodegradable polymer) | Durect Corporation |
| Lacovyl | PVC copolymers | Arkema Group |
| Lacqrene | HIPS | Total Petrochemicals |
| Lacqtene | LDPE | Total Petrochemicals |
| Lactel | Biodegradable polymers | Birmingham Polymers |
| Laestra | SPS | Lati Industria Termoplastici S.p.A. |
| Lagomix | PE | Polinter |
| Lagotene | PE | Polinter |
| Lajaprene | SBS | Laja SA |
| Lajavinyl | PVC | Laja SA |
| Lamapet | PET | Mitsubishi Chemicals |
| Lamdex | LDPE foam | Dow Chemical |
| Lamide | PA | LAMPLAST di Aldo Redaelli e C. s.a.s. |
| Lamigamid | PA 12 | G. Schwartz GmbH + Co KG |
| Lanoform | POM | Godiplast GmbH |
| Lanomid | PA | Godiplast GmbH |
| Lanoprop | PP | Godiplast GmbH |
| Lanufene | HDPE | Vebel S.r.l. |
| Lapex A, B | PES, PPSU | Lati Industria Termoplastici S.p.A. |
| Laprene | SEBS (TPE-S) | So.F.Ter S.p.A. |
| Laramid | PPA | Lati Industria Termoplastici S.p.A. |
| Laricol | TPU | COIM S.p.A. |
| Larflex | TPO | Lati Industria Termoplastici S.p.A. |
| Laril | PPOm | Lati Industria Termoplastici S.p.A. |
| Laripur | TPU | COIM S.p.A. |
| Larithane | PU elastomer | COIM S.p.A. |
| Larpeek | PEEK | Lati Industria Termoplastici S.p.A. |
| Larton | PPS | Lati Industria Termoplastici S.p.A. |
| Laser + | PET | DAK Americas |
| Lastane | PUR | Lati Industria Termoplastici S.p.A. |
| Lastik | Theromoplastic resin & alloys | CAS Kunststoffe |
| Lastil | SAN | Lati Industria Termoplastici S.p.A. |
| Lastilac | ABS, ABS/PC | Lati Industria Termoplastici S.p.A. |
| Lastirol | PS | Lati Industria Termoplastici S.p.A. |
| Lasulf | PSU | Lati Industria Termoplastici S.p.A. |
| Latamid | PA 6, PA 66, PA 68 | Lati Industria Termoplastici S.p.A. |
| Latan | POM | Lati Industria Termoplastici S.p.A. |
| Latene | HDPE, PP | Lati Industria Termoplastici S.p.A. |
| Later | PBT | Lati Industria Termoplastici S.p.A. |
| Latigea | PLA | Lati Industria Termoplastici S.p.A. |
| Latilon | PC | Lati Industria Termoplastici S.p.A. |
| Latilub | Self lubricating PC | Lati Industria Termoplastici S.p.A. |
| Latiohm | PA, POM conductive resin | Lati Industria Termoplastici S.p.A. |
| Latishield | EMI shielding resin | Lati Industria Termoplastici S.p.A. |
| Latistat | Antistatic resin | Lati Industria Termoplastici S.p.A. |
| Lauramid | PA 12 | Handtmann ELTEKA Kunststofftechnik |
| Lavirex | EVA compound | Finproject S.p.A. |
| Laxtar | LCP | Lati Industria Termoplastici S.p.A. |
| Lay | PC/ABS | Lucky Enpla Co. Ltd. |
| Lemalloy | mPPE | Mitsubishi Engineering Plastics |
| Lemapet | PBT | Mitsubishi Engineering Plastics |
| Lennite | UHMWPE, LDPE, HDPE | Westlake Plastics |
| Leomide | PI film | Kolon Industries |
| Leona | PA 66 | Asahi Kasei |
| Leostomer | TPE-S | Riken Technos |
| Levamelt | HNBR | Lanxess |
| Levapren | HNBR | Lanxess |
| Levblend | PC/ABS | Bayer MaterialScience |
| Lexan | PC | Sabic Innovative Plastics |
| Lexan SLX | Amorphous PC copolymer | Sabic Innovative Plastics |
| Lexguard | Bullet resistant PC | Sabic Innovative Plastics |
| LGExpol | EPS | LG Chemical |
| LGF | PC | Lucky Enpla Co. Ltd. |
| LGStrene | PS | LG Chemical |
| Lifoflex | TPE-S | Mueller Kunststoffe |
| Lifolit | Soft PVC | Mueller Kunststoffe |
| Lifoprene | TPU | Mueller Kunststoffe |
| Lighter | PET | Equipolymers s.r.l. |
| Lightlon | LDPE foamed sheet | Sekisui Plastics Co., Ltd. |
| Lignostone | Phenolic resin | Roechling Engineering Plastics KG |
| Limera | SMA | Dainippon Ink & Chemicals |
| Linathene | LLDPE | USI Far East Corporation |
| LinTech | LLDPE | Braskem |
| Lipol | PP | Exopt |
| Lionpol | TPE, TPO, TPV | Lion Polymers |
| Litac-A | SAN | Nippon A&L |
| Liten | HDPE | Chemopetrol A.S. |
| LiveFresh | Antibacterial PA filament yarn | Toray Industries |
| Lomod | TPE | Sabic Innovative Plastics |
| Longhua | PC film | Mianyang Longhua Film Co., Ltd. |
| Longlite | PBT, PBT/ABS, TPEE | Chang Chun Group |
| Lonoy | PC/PET | Guangzhou Kingfa Science and Technology Co., Ltd. |
| Lottmer | TPEV | Honam Petrochemical Corporation |
| Lotrene | LDPE | Qatar Petrochemical Company Ltd. |
| Low E Poly | TPO sheet | Spartech |
| LPC | PC | Lucky Enpla Co. Ltd. |
| Luban | PP | Oman Polypropylene LLC |
| Lubelac | ABS | Luben Plast |
| Lubemid | PA | Luben Plast |
| Lubemix | PC/ABS | Luben Plast |
| Lubexan | PC | Luben Plast |
| Lublene | PP | Luben Plast |
| Lubmer | UHMWPE | Mitsui Chemicals |
| Lubotene | LDPE film | Optatech |
| Lubriblend | Internally lubricated PA, POM | TP Composites |
| Lubricomp | Wear resistant resin | Sabic Innovative Plastics |
| Lubrilon | PA, PC | A. Schulman |
| Lubriloy | Internally lubricated resins | Sabic Innovative Plastics |
| Lubri-Tech | Internally lubricated resins | PolyOne |
| Lubrix | PPS | Plasti Green |
| Lucalen | Ethylene/acrylate copolymer | LyondellBasell Industries |
| Lucalor | Chlorinated PVC | Arkema Group |
| Lucet | POM | LG Chemical |
| Lucel | POM | LG Chemical |
| Lucite | PMMA | Lucite International |
| Luckpor | EPS | LG Chemical |
| Lucobit | PE/bitumen blend | Lucobit AG |
| Lucofin | PE | Lucobit AG |
| Lucolit | PE | Lucobit AG |
| Lucon | ABS | LG Chemical |
| Lucopren | TPE/PP | Lucobit AG |
| Lucalor | Chlorinated PVC | Arkema Group |
| Lucryl | PMMA | BASF |
| Luflexen | mLLDPE | LyondellBasell Industries |
| Lukor | HDPE | Lukoil |
| Lumation | Light Emitting Polymer | Dow Chemical |
| Lumax | ABS/PBT | LG Chemical |
| Lumenex | PP | Ferro |
| Lumiflon | FEVE | Asahi Glass Company |
| LumiLid | PET film | Toray Industries |
| Lumirror | PET film | Toray Industries |
| Lumitac | LLDPE | Tosoh |
| Lupan | SAN | LG Chemical |
| Lupet | PET | LG Chemical |
| Lupol | PP | LG Chemical |
| Lupolen | LDPE, HDPE | LyondellBasell Industries |
| Lupolex | LLDPE | LyondellBasell Industries |
| Lupon | PA | LG Chemical |
| Lupos | ABS, ABS/SAN | LG Chemical |
| Lupox | PBT | LG Chemical |
| Lupoy | PC, PBT, ABS/PC | LG Chemical |
| Lupranol | Polyether polyols | Elastogran |
| Lupraphene | Polyester polyols | Elastogran |
| Luran | SAN, ASA | BASF |
| Luran S | ASA (PC) | BASF |
| Luranyl | PPE/HIPS, PPE/PA | Romira GmbH |
| Lurethane | TPE | Ludowici Platics Ltd. |
| Lusep | PPS, Syndiotactic PS | LG Chemical |
| Lustran | ABS, SAN, ABS+PMMA | Lanxess GmbH |
| Lutene | PE | LG Chemical |
| Lutrel | Flame retardant PBT | LG Chemical |
| Luvocom | PA 66, PAEK, PEEK, PBT, PA 6, PC, POM, POM/PTFE | Techmer Lehvoss LLC |
| Luvogard | PP | Lehmann & Voss |
| Luvopor | TPE | Lehmann & Voss |
| Luvotech | PA 6 | Techmer Lehvoss LLC |
| Luxacryl | PMMA | TTV GmbH |
| Luxamid | PA 6, PA 66 | Dilaplast |
| Luxene | PE | M.P.B. S.r.l. |
| Luytex | Polyester thermoset | Trelleborg Sealing Systems |
| Lycra | Spandex fiber | Invista |
| Lytex | Carbon reinforced epoxy | Quantum Composites |
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