Roxtec
Roxtec is a Swedish industrial technology company that develops modular cable and pipe sealing systems for critical infrastructure and equipment.
Last updated August 31, 2026
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Overview
Roxtec is a Swedish industrial technology company specializing in cable and pipe penetration seals, commonly referred to as multi-cable transits. Its systems are designed to close openings where cables, pipes, and other services pass through walls, decks, floors, cabinets, and equipment. The seals are intended to protect installations from several risks at once, including fire, water, gas, dust, vibration, electromagnetic interference, vermin, and explosive atmospheres. The company was founded in Sweden in 1990 following the development of Multidiameter, a modular sealing concept based on layers that can be removed to accommodate cables and pipes of different diameters. This adaptability distinguishes Roxtec's systems from fixed-size sealing solutions and allows a single frame or module family to support changing installation requirements. The approach is particularly useful in projects where cable bundles are modified during construction, commissioning, maintenance, or later expansion. Roxtec serves a broad industrial customer base. Its applications extend across power generation and transmission, renewable energy, nuclear facilities, marine and naval construction, oil and gas, telecommunications, data centers, transport, industrial equipment, process industries, infrastructure, hospitals, laboratories, and controlled environments. In the energy sector, its products have been used in offshore wind farms, substations, converter stations, cable trenches, nuclear facilities, drilling rigs, and large oil and gas developments. In marine applications, the systems are used on commercial ships, naval vessels, passenger ships, offshore construction vessels, and superyachts, where penetration seals must maintain the integrity of fire-rated and watertight compartments. The company also supplies solutions for infrastructure and specialized buildings. These include tunnels, bridges, airports, metro systems, water-treatment facilities, pharmaceutical plants, hospitals, laboratories, clean rooms, and containment rooms. Airtight and gas-tight sealing is important in such environments because cable and pipe entries can compromise pressure control, contamination protection, or biological containment. Roxtec systems have been described as suitable for certain CL3 and CL4 containment applications and for environments requiring positive or negative pressure integrity. Industrial-equipment applications include electrical cabinets, generators, turbines, robots, rolling stock, trackside systems, and vehicles. The company's products have been used in railway equipment and London Underground-related applications, where compactness, fire performance, and protection of power and communications connections are important. Telecommunications uses include network shelters, cabinets, switching facilities, radio sites, rooftop installations, and modular data centers. Roxtec operates from Sweden through subsidiaries and distributors. Roxtec International AB has been reported as certified under ISO 9001 for quality management and ISO 14001 for environmental management. Its products are tested or approved against sector-specific requirements, including marine fire and division standards, and have been certified by classification organizations such as Lloyd's, ABS, Bureau Veritas, and DNV GL for relevant applications. The company is owned by Mellby Gård Industri and is led by chief executive Magnus Holmberg. Its business model combines standardized sealing products with application engineering and project support for technically demanding installations.
History
Roxtec originated in Sweden in 1990 after the invention of Multidiameter, a modular sealing technology for cable and pipe penetrations. The central idea was to make penetration sealing adaptable rather than dependent on a separate fixed-size seal for every cable or pipe. Multilayer modules can be adjusted by removing layers, allowing the same basic system to accommodate different diameters and to respond to changes in an installation's cable schedule. From this foundation, Roxtec developed a portfolio for environments in which openings through walls, floors, decks, bulkheads, cabinets, and equipment must remain protected. The relevant hazards can include fire, flooding, gas, dust, vibration, electromagnetic disturbance, vermin, and explosion. This made the technology applicable to sectors where penetration failures can interrupt operations or compromise safety, including power generation, marine construction, offshore energy, process plants, transport, telecommunications, and critical buildings. The company expanded its industrial and energy presence through projects in oil and gas, including work associated with North Sea facilities, offshore drilling equipment, the Gorgon gas project in Western Australia, and the Kashagan development in Kazakhstan. In power, Roxtec systems were used in transmission and distribution infrastructure, nuclear facilities, renewable-energy installations, and offshore wind farms. Applications in offshore wind extended across turbine generators, towers, nacelles, converter equipment, substations, transition pieces, control cabinets, and associated grid infrastructure. Marine became another important field. Roxtec products were used in shipbuilding, ship conversion, repair, and upgrade work for commercial, naval, passenger, and offshore vessels. The systems were described as tested and approved for relevant A-class and H-class divisions under maritime requirements, with certifications from several classification societies. Royal Navy examples included refit work on HMS Lancaster and use on other fleet vessels. Offshore wind-turbine installation vessels also formed part of the company's maritime application base. Roxtec broadened its reach into infrastructure and specialized industrial buildings. Its systems were applied to tunnels, bridges, airports, metro systems, water-treatment facilities, pharmaceutical plants, hospitals, laboratories, clean rooms, and containment environments. In these settings, airtight or gas-tight cable and pipe entries help preserve controlled pressure and contamination conditions. Examples cited for the United Kingdom include isolation rooms at the Royal Victoria Hospital in Belfast and laboratory facilities associated with molecular biology research in Cambridge. The company also developed applications for telecommunications, data rooms, industrial equipment, and rail. Its seals have been used in telecom shelters, cabinets, communications centers, radio links, base-station shelters, and modular data centers. In rolling stock, the technology was applied to Bombardier Electrostar trains serving London's rail network, where the design requirements included low weight, compact installation, and fire resistance. Approval for London Underground applications was reported in 2017. Roxtec's international structure includes subsidiaries and distributors outside Sweden. The company has participated in industry bodies covering energy, maritime engineering, rail, oil and gas, and sustainable ports. Roxtec International AB has been reported as certified to ISO 9001 and ISO 14001. Recognition during the 2000s and 2010s included Swedish growth and export awards, the 2011 HazardEx Environmental Protection award, Sweden's Best Managed Companies recognition in 2019, and the Energy Industries Council's Diversification award in 2020. Roxtec is owned by Mellby Gård Industri, and Magnus Holmberg is identified as its chief executive.
- 2020
Energy Industries Council Diversification award
[1]Roxtec Ltd won the EIC Diversification award for its cross-sector business development.
- 2019
Sweden's Best Managed Companies recognition
[1]Roxtec International received recognition in the Sweden's Best Managed Companies program.
- 2017
London Underground approval
[1]Roxtec's sealing system was approved for London Underground use.
- 2011
HazardEx Environmental Protection award
[1]The company received an award for environmental contribution associated with renewable-energy and hazardous-area applications.
- 2010
Grand Export Prize
[1]Roxtec received the Swedish Trade Council's Grand Export Prize.
- 2009
Recognition among Swedish high-performing companies
[1]Roxtec was included in Swedish business rankings described as recognizing highly successful and fast-growing companies.
- 1990
Roxtec founded in Sweden
[1]Roxtec was established in Sweden following the invention of its Multidiameter modular sealing concept.
Products and positioning
A specialized global supplier of adaptable, safety-critical cable and pipe sealing systems for energy, marine, infrastructure, telecommunications, transport, industrial, and process-industry applications.
Modular cable and pipe transit · 1990
Multidiameter modular sealing system
Roxtec's foundational technology uses modules made with removable layers. Installers can adjust the modules to the diameter of individual cables or pipes, enabling adaptable sealing without requiring a completely different fixed-size component for every penetration. The system is intended for installations where cable layouts may vary during construction or later maintenance.
Cable sealing
Cable transit systems
These systems seal groups of power, control, communications, and data cables passing through walls, floors, decks, bulkheads, cabinets, and equipment. Depending on the application, they provide protection against fire, water, gas, dust, vibration, electromagnetic interference, vermin, and explosive conditions. They are used in energy, marine, transport, telecoms, infrastructure, and industrial facilities.
Pipe sealing
Pipe transit systems
Roxtec pipe sealing solutions are used where metal or plastic pipes pass through structural divisions or equipment boundaries. Applications include ships, offshore facilities, process plants, substations, industrial buildings, and controlled environments. The systems are designed to maintain the required barrier against hazards such as water, fire, gas, dust, or pressure loss.
Electromagnetic compatibility protection
EMC sealing solutions
EMC-oriented Roxtec seals combine cable penetration sealing with protection against electromagnetic disturbances. They are relevant to electrical systems whose reliability depends on maintaining electromagnetic compatibility, including power plants, offshore energy projects, industrial equipment, communications infrastructure, and control systems.
Controlled-environment sealing
Airtight and containment-room seals
These solutions are designed for laboratories, hospitals, pharmaceutical facilities, clean rooms, and biological containment areas. By reducing and sealing cable and pipe entries, they help preserve airtight integrity under positive or negative pressure. The products have been described as approved for selected CL3 and CL4 containment-room applications.
Brand decisions
2017
Expansion into London Underground applicationsStrategyBackground
Railway and metro systems require compact, fire-resistant protection for power and communications connections.
Action taken
Roxtec's sealing system received approval for use on London Underground.
Aftermath
The approval strengthened the company's position in rail and urban transport infrastructure.
1990
Introduction of Multidiameter technologyProduct launchBackground
Cable and pipe penetration projects often require seals for multiple diameters and may change during installation or maintenance.
Action taken
Roxtec was founded around a modular system whose removable layers allow one sealing concept to be adapted to different cable and pipe sizes.
Aftermath
The technology became the basis of Roxtec's product portfolio and supported expansion across energy, marine, infrastructure, telecoms, transport, and process industries.
Recent events
- 2020
Roxtec recognized for strategic diversification[1]
Other
Roxtec Ltd received the Energy Industries Council's Diversification award for expanding its activities across multiple energy and industrial sectors.
- 2020
Roxtec UK receives EIC Diversification Award[1]
Other
Roxtec Ltd was recognized by the Energy Industries Council for diversifying its business across multiple energy and industrial market sectors.
- 2019
Roxtec International named a Sweden's Best Managed Company[1]
Other
Roxtec International received recognition in the Sweden's Best Managed Companies program, which evaluates private companies on strategy, execution, culture, and financial performance.
- 2019
Roxtec International receives Sweden's Best Managed Companies recognition[1]
Other
The private Swedish company received recognition associated with strategic direction, execution, corporate culture and financial performance.
- 2017
Roxtec cable sealing system approved for London Underground use[1]
Other
The company's sealing system received approval for use in London Underground applications, extending its transport-sector reach.
- 2017
Roxtec sealing system approved for London Underground[1]
Regulation · Product launch
The sealing system was approved for use on London Underground applications, extending the brand's rail-sector reach in the United Kingdom.
- 2011
Roxtec wins Environmental Protection award[1]
Other
Roxtec received a HazardEx Environmental Protection award connected with its work in renewable energy and potentially explosive industrial environments.
- 2011
Roxtec receives HazardEx Environmental Protection award[1]
Other
Roxtec's work connected with UK wind farms was recognized for an environmental contribution involving energy-efficient processes or products in potentially explosive atmospheres.
- 2010
Roxtec receives Swedish Trade Council Grand Export Prize[1]
Other
The company was awarded the Swedish Trade Council's Grand Export Prize in recognition of international business development.
Sources1 sources
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