Mersen

What Mersen does

Mersen is a French-listed industrial group (Euronext Paris: MRN; OTC: CBLNY) founded in 1892 as Société Le Carbone and headquartered in Courbevoie, France. The company designs, manufactures, and sells advanced materials and electrical power components across two segments: Advanced Materials (impervious graphite grades under the Graphilor® brand, Boostec® sintered silicon carbide, and corrosion-resistant process equipment) and Electrical Power (fuses, bus bars, slip rings, carbon brushes, capacitors, and cooling solutions). Its proprietary technologies enable operation in extreme environments — up to 430°C service temperatures, full vacuum to 12 barg pressure ranges, and 600°C aerospace applications — addressing corrosion, thermal management, and high-voltage circuit protection. The company operates 54 industrial sites and 24 R&D centers across 32 countries, employing approximately 7,259 people globally and joined the SBF 120 index in June 2026.

Mersen serves seven primary verticals: aerospace, chemicals, energy (wind, solar, BESS), semiconductors, electric vehicles, railways and metro, and emerging nuclear micro-reactors. The business model is B2B hardware sales — quotation-based pricing through direct enterprise field sales supplemented by industrial distributors (e.g., Heilind Electronics for fuse switches). Process equipment is custom-engineered (450 units produced annually), while electrical components are sold through configured SKUs and channel partners. 59% of 2025 sales were tied to energy-transition markets, with FY2025 sales of €1,186 million (-3.2% YoY) and Q1 2026 sales of €296 million (+3.1% organic). The customer base spans industrial OEMs and operators in chlor-alkali, aerospace propulsion, wind turbine generators, semiconductor wafer processing, EV charging infrastructure, rail transit, and now micro-modular nuclear reactors (via Terra Innovatum partnership, FOAK 2027). New product launches in 2026 include 1,000V/1,000A AC/DC combined fuses for EV charging and static charging systems for urban tramways.

Name

Mersen

Legal name

Mersen Corporate Services SAS

Website

https://mersen.com

Company type

Public

Founded year

1892

Operating status

Operating

Headcount range

5,001–10,000 employees

Short description

Mersen is a French-listed industrial group (Euronext Paris: MRN) that designs and manufactures advanced graphite and silicon carbide materials plus electrical power components (fuses, bus bars, slip rings, carbon brushes, heat exchangers) for aerospace, chemicals, energy, semiconductors, EV, rail, and nuclear micro-reactor customers across 32 countries.

Ownership category

akta.pro rank

Product category

Industrial Materials & Electrical Components

NAICS

Carbon and Graphite Product Manufacturing (335991), Electrical Equipment Manufacturing (3353), Other Electrical Equipment and Component Manufacturing (3359)

SIC

Electronic & Other Electrical Equipment (No Computer Equip) (3600), Fabricated Rubber Products, Nec (3060), Screw Machine Products (3451)

akta.pro primary industry

Functional Carbon Fillers (Carbon Black, Graphite) (IMAEAFAO)

Keywords

• Advanced graphite materials
• Electrical power components
• Industrial heat exchangers
• Carbon brushes slip rings
• Circuit protection fuses

Headquarters

HQ city

Paris

HQ country

France

HQ region

Europe

Offices5 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Operations, Supply Chain, Personnel, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Advanced Materials Sales: Sales of graphite specialties, impervious graphite products, silicon carbide components, and advanced materials for industrial corrosion protection and high-temperature applications
2. Electrical Power Components: Sales of fuses, bus bars, heat sinks, capacitors, slip rings, and carbon brushes for power management and transfer applications across industrial sectors
3. Process Equipment: Customized heat recovery units, heat exchangers, HCl burners, PTFE-lined columns, and anticorrosion equipment for chemical processing industries
4. Machining Services: GMI Group acquisition (~$40M annual sales) expanding machining capacities for graphite and advanced materials in the United States

Pricing tiers

Go-to-market motion3 records

Distribution channels4 records

Marketing channels9 records

Core offering

Mersen designs, manufactures, and sells graphite-based advanced materials (impervious graphite, sintered silicon carbide, carbon composites) and electrical power components (fuses, bus bars, heat sinks, capacitors, slip rings, carbon brushes). The company also produces customized process equipment such as graphite and silicon carbide heat exchangers, HCl burners, and PTFE-lined columns for the chemical processing industry, serving aerospace, chemicals, energy, semiconductors, EV, and rail markets.

Product overview

Mersen is a global expert in electrical power and advanced materials serving high-tech industries. The company operates two main segments: Advanced Materials (impervious graphite, Graphilor materials, Sintered Silicon Carbide, carbon composites) and Electrical Power (fuses, bus bars, cooling solutions, capacitors, slip rings, carbon brushes). The portfolio includes corrosion-resistant process equipment (heat exchangers, columns, HCl burners), power transfer systems (brushes, brush-holders, slip rings, current collectors), circuit protection (fuses for EV, railway, industrial), and specialized products for aerospace, wind, rail, chemicals, and emerging nuclear micro-reactor applications. Mersen's offerings combine materials expertise with engineered components, supported by simulation tools, on-site maintenance, and testing services.

Differentiator

Problem solved

Functional benefit

Brands

• Graphilor®: Impervious graphite materials for chemical applications - phenolic resin impregnated (BS, XBS), PTFE impregnated (XTH), and carbon impregnated (XC) grades
• Polybloc®
• Boostec®
• ProGrid

Products and services

• Bus Bars Laminated bus bars for efficient power distribution in electrical systems, reducing assembly time and wiring errors for industrial OEMs and power-electronics manufacturers.
• Isostatic & Extruded Graphite High-performance graphite materials, including impervious Graphilor® grades, used for corrosion-resistant process equipment in chemical and high-temperature industrial applications.
• ABAT Fuses (DC Protection for EV and Batteries) Advanced battery protection fuses designed for electric vehicle and battery energy storage system applications, providing DC overcurrent protection for high-voltage battery packs.
• Polybloc® Graphite Block Heat Exchanger Modular graphite block heat exchangers for heating, cooling, condensation, evaporation and absorption of highly corrosive liquid chemicals, offering up to 350 m² heat transfer surface across block diameters from Ø100 to 1500 mm.
• Heat Exchangers (Graphite Shell & Tube, Cubic, SSiC, Annular Groove) Complete range of heat exchangers including graphite shell and tube, cubic graphite, silicon carbide, and annular groove variants for corrosive chemical processes in the chlor-alkali and specialty chemicals industries.
• Sintaclor® HCl Burners Specialized burners for hydrochloric acid production in the chlor-alkali industry, recovering 800 KWH per ton of burned chlorine and reducing cooling water consumption by 65%.
• Graphilor® Impregnated Graphite Materials Impervious graphite materials with phenolic resin, PTFE, or carbon impregnation (BS, XBS, XTH, XC grades) for chemical resistance, manufactured internally at US and China plants with full traceability.
• Carbon Brushes Range Metal graphite brushes for current and signal transmission, including grades for wind turbines (CG626, CG677), turbo generators (LFC554), and various industrial applications requiring high electrical conductivity and wide speed range.
• Current Collector Device (CCD) Shoes Specialized systems for transferring electrical power from track to train, including third rail shoes with robust construction and efficient power transfer capabilities for rail transport fleets.
• Pantograph Contact Strips Overhead power collection components for electric railways ensuring continuous and stable connection between train and overhead lines for high-speed rail, metros, and trams.
• Earth Return Current Units Grounding brush systems for safe and efficient return of electrical current to ground in rail systems, preventing stray currents that can cause rail corrosion and signal interference.
• Boostec® Space Optics High-performance optics designed for space telescopes and observational instruments, made from Boostec® silicon carbide substrates with superior rigidity and thermal stability.
• Capacitors for Aeronautics & Defence Energy storage capacitors for aerospace applications, releasing energy when needed for quick bursts of power in aircraft systems.
• Cooling Solutions & Services (Heat Sinks) Heat sinks for thermal management including LV100 series and battery thermal management solutions for aerospace, power electronics, and industrial applications.
• Graphilor® Graphite Rupture Discs Bursting discs and rupture discs made from impervious graphite for overpressure protection in chemical and industrial applications.
• ProGrid AC/DC Combined Fuse Solutions AC/DC combined fuse solutions combining AC and DC ratings in a single compact housing, eliminating the need for separate fuse types across AC and DC power stages for EV charging, grid-scale storage, and data center applications. Nominated for GIT Security Award 2026.
• MEV100 Series 1,000 VDC Fuse Solutions 1,000 VDC fuse solutions designed for next-generation electric vehicles, providing overcurrent protection for high-voltage DC bus architectures in EV powertrains and charging infrastructure.
• FS Series Class J Fuse Switches Compact fused disconnect solutions for industrial motor and control applications, available in single, 2-pole, and 3-pole configurations in 30 amp and 60 amp sizes, utilizing Class J fuses with up to 200kA short-circuit current rating.
• Static Charging System for Urban Tramways Ground-level charging system using inductive or conductive pad technology embedded in roadways for wireless tram charging, eliminating overhead catenary wires and reducing lifecycle costs for urban tramway operators.
• Nuclear-Grade Graphite for Micro-Modular Reactors Nuclear-grade graphite materials and reactor core prototypes developed for Terra Innovatum's SOLO Micro-Modular Reactor program, supporting first-of-a-kind deployment targeted for 2027 and commercial production from 2028.
• GMI Group Graphite Machining Services Graphite machining services for aerospace, process industries, and energy sectors, providing custom-machined graphite and advanced-material components across Mersen's US operations following the GMI Group acquisition.

Quantifiable outcome

• 600°C operating temperature capability for aerospace applications
• +6 more outcomes

Named customers3 records

Segments8 records

Ideal customer profiles6 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

One partnership is on record.

• Terra Innovatum Global N.V.coreStrategic or Co-development Partner · 1 April 2025Strategic partnership for nuclear-grade graphite supply and reactor core prototype production for the SOLO Micro-Modular Reactor program. Mersen and Terra Innovatum achieved key graphite reactor core prototype milestone supporting first SOLO micro-reactor deployment targeted for 2027, with commercial production beginning in 2028. The collaboration validates reactor system integration for scalable manufacturing of next-generation nuclear technology.

Scale indicators16 records

Recent moves8 records

Expansion highlights7 records

Broad incumbents

• Schneider Electric: French industrial peer serving similar data-center, EV-charging and electrical-distribution end-markets with power management, fuses and protection products; broader portfolio but overlapping customer base.
• Eaton: Global power-management leader offering electrical components including fuses, bus bars and power distribution that overlap with Mersen's Electrical Power segment, but at much broader scale and across more end-markets.
• ABB: Swiss-Swedish broad-line electrical equipment and industrial automation incumbent; overlaps with Mersen's electrical-power components (fuses, capacitors, bus bars) particularly in rail, energy and process industries.

Direct peers

• Tokai Carbon: Japanese graphite and carbon-black producer with comparable impervious graphite, fine carbon and smelting products. Overlaps directly with Mersen's graphite specialties and anticorrosive equipment.
• CoorsTek: Privately held US technical ceramics manufacturer producing silicon carbide and other advanced ceramics for semiconductor, aerospace and chemical applications — directly comparable to Mersen's Boostec SSiC line.
• Schunk Group: German privately held maker of carbon technology and technical ceramics, including SiC products for similar high-temperature, semiconductor and industrial applications as Mersen.
• SGL Carbon: German-listed specialist in graphite, carbon fibers and composite materials serving similar industrial end-markets (chemicals, automotive, aerospace, energy). Closest direct comparable to Mersen's Advanced Materials segment.
• Morgan Advanced Materials: UK-listed advanced materials specialist with carbon, graphite, ceramic and SiC products serving aerospace, defense, energy and industrial customers — closely comparable to Mersen's Advanced Materials business.

Others

• Avocarbon (part of Mersen Group): Listed as an acquired subsidiary rather than peer; referenced only because the historical acquisition footprint shows overlap with current Mersen's carbon-brush portfolio.
• Carbone Lorraine (historical/Mersen legacy): Pre-2010 predecessor name for Mersen (formerly Carbone Lorraine); included for historical context rather than as a current competitor.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• YouTubeyoutube.com/user/MersenGroup
• Facebookfacebook.com/mersen
• LinkedInlinkedin.com/company/mersen
• Instagraminstagram.com/mersengroup
• Xx.com/mersensa

Compliance12 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Subsidiaries1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A16 records

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Mersen