Röhm produces methacrylate monomers (MERACRYL®), PMMA molding compounds (PLEXIGLAS®) and methacrylate semi-finished products at production sites in Europe, North America and China.
Röhm GmbH
Darmstadt · Worms · Wesseling · Hanau · Weiterstadt · Bay City, TX · Osceola, AR · Wallingford, CT · Parsippany, NJ · Shanghai · Veracruz · Mexico CityNew on Amplifa
About Röhm
Röhm GmbH is one of the world's leading manufacturers in methacrylate chemistry and supplies customers in growth markets such as the automotive industry, construction and medical technology. The company produces methyl methacrylate (MMA) under the MERACRYL® brand, PMMA molding compounds under the PLEXIGLAS® and ACRYLITE® brands, copolymers for medical technology (CYROLITE®), PMMI molding compounds (PLEXIMID®), reactive resins (DEGADUR®), binders (DEGALAN®), cold plastic for road markings (DEGAROUTE®) as well as CyPlus® cyanides. Production takes place in an integrated production network across four business units (Bulk Monomers, Molding Compounds, Methacrylate Resins, CyPlus Technologies), including the proprietary C2-based LiMA technology for resource-efficient MMA production. Parts and semi-finished products are manufactured by injection molding (including Mold-in-Color) and extrusion. Around 2,700 employees at production and research sites in Europe, North America and China generate revenue of €1.4 billion (2025). The company is headquartered in Darmstadt; its largest site is Worms.
- Site
- Darmstadt
- Processes
- Mold-in-Color injection molding (colored molding compounds instead of painting), Injection molding of PMMA/copolymer molding compounds, Extrusion of semi-finished products (PLEXIGLAS® semi-finished products), MMA production using LiMA C2 technology (ethylene/methanol-based), Production of methacrylate monomers (MERACRYL®), Production of cold-curing reactive resins for flooring, Production of cold plastic for road markings, Take-back of industrial packaging
- Materials
- PMMA (polymethyl methacrylate), PMMA (Americas), PMMA copolymers for medical technology, PMMI (polymethacrylimide), Methyl methacrylate (monomer), Cold-curing methacrylate reactive resins, Methacrylate-based binders, Cold plastic road marking
- Founded
- 1907
- Employees
- 2700
- Industries
- Automotive & Transport, Construction & Architecture, Paints & Coatings, Precious Metal Mining, Lighting, Electronics, Optics, Medical Technology
- 01
Raw material supply (ethylene, methanol)
- 02
MMA synthesis (LiMA C2 technology)
- 03
Monomer processing/distillation
- 04
Polymerization into PMMA molding compounds and copolymers
- 05
Injection molding/extrusion into semi-finished products and molded parts
- 06
Logistics (tank and transshipment terminals, truck, rail, inland waterway)
Materials & Processes
Methyl methacrylate (MMA)
Global monomer portfolio with over 80 years of experience as a basic building block for downstream applications.
PMMA (polymethyl methacrylate)
Standard and specialty molding compounds for automotive, lighting, optics and household appliances.
PMMA (Americas)
PMMA molding compounds for the American market, among other things for permanent outdoor applications.
PMMA copolymers
Copolymers based on methacrylates, developed specifically for medical technology.
PMMI (polymethacrylimide)
Molding compound for high-performance optics with high continuous service temperature.
Methacrylate reactive resins
Solvent-free, cold-curing resins for high-quality flooring.
Methacrylate binders
Binders for applications requiring weather resistance, brilliance and color stability.
Methacrylate cold plastic
Solutions for sustainable road markings.
Cyanides
Products and technologies for precious metal mining, the chemical-pharmaceutical industry and metal surface treatment.
Sites
Darmstadt
DEHeadquarters / Holding
Worms
DEProduction site (largest site, approx. 1,300 employees)
Wesseling
DEMMA production site
- Materials
- MMA
Hanau (Industrial Park Wolfgang)
DEProduction and research site
Weiterstadt
DEProduction site for PLEXIGLAS® semi-finished products
- Materials
- PMMA
- Extrusion machines
Bay City, TX
USMMA production (LiMA), approx. 90 employees
- Materials
- MMA
- C2 reactor system (LiMA)
- MMA distillation plant
- Digital twin
Osceola, AR
USProduction site for ACRYLITE®/CYROLITE® molding compounds
- Materials
- PMMA
Wallingford, CT
USProduction site + Innovation Center
- Materials
- PMMA
Shanghai (Shanghai Chemical Industry Park)
CNProduction site (MERACRYL®, PLEXIGLAS® molding compounds)
- Materials
- MMA, PMMA
Veracruz (Coatzacoalcos)
MXProduction site CyPlus Idesa (cyanides)
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Mold-in-Color injection molding (colored molding compounds instead of painting)Plastics | – | – | – | – | PLEXIGLAS® PMMA molding compounds |
| Injection molding of PMMA/copolymer molding compoundsPlastics | – | – | – | – | PLEXIGLAS® (PMMA), ACRYLITE®, CYROLITE®, PLEXIMID® (PMMI) |
| Extrusion of semi-finished products (PLEXIGLAS® semi-finished products)Plastics | – | – | – | – | PLEXIGLAS® (PMMA) |
| MMA production using LiMA C2 technology (ethylene/methanol-based)Plastics | – | – | – | – | Methyl methacrylate (MMA) |
| Production of methacrylate monomers (MERACRYL®)Plastics | – | – | – | – | Methyl methacrylate (MMA), Methacrylate monomers |
| Production of cold-curing reactive resins for flooringPlastics | – | – | – | – | Methacrylate reactive resins |
| Production of cold plastic for road markingsPlastics | – | – | – | – | Methacrylate cold plastic |
3 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Extrusion machines | – | 18 | – | – | Weiterstadt (history, 1969 first hall) |
| C2 reactor system (LiMA MMA production) | – | – | – | 2025 | Bay City, TX, USA |
| MMA distillation plant | – | – | – | – | Bay City, TX, USA |
Additional services
Reference customers
History
- 1907
Founding of the company Röhm & Haas OHG by Dr. Otto Röhm and Otto Haas in Esslingen
- 1909
Relocation of company headquarters and production to Darmstadt; first US branch established by Otto Haas
- 1933
Development of PLEXIGLAS® (PMMA), brand name registered
- 1937
Gold medal at the World Exhibition in Paris for the PLEXIGLAS® invention
- 1969
Commissioning of the first production hall in Weiterstadt with 18 extrusion machines
- 1971
Renaming to Röhm GmbH following the exit of the Haas family
- 1989
Röhm GmbH becomes a 100% subsidiary of Hüls AG
- 1999
Merger with Agomer GmbH after the Degussa/Hüls fusion; product lines DEGADUR®, DEGALAN®, DEGAROUTE®
- 2009
Full inauguration of the new integrated production facility in Shanghai
- 2025
Commissioning of the LiMA MMA plant in Bay City, Texas (March 2025)
- 2026
Official full-scale opening of the Bay City MMA plant with LiMA technology (June 2026)