FSI

What FSI does

FSi Limited, trading as FSi Promat, is a UK-based manufacturer of passive fire protection products and a wholly-owned subsidiary of Belgian building materials conglomerate Etex N.V. Founded in 2000 and headquartered in Measham, Leicestershire, the company operates from a manufacturing site in Measham and a distribution centre, Firesafe & Sound, in Grays, Essex. It self-describes as the UK's largest manufacturer of passive fire protection products, employing 51-100 people and offering a portfolio of more than 20 SKUs across penetration seals, linear gap seals, and cavity barriers.

The core technology is built on proprietary intumescent and ablative material formulations, mineral wool composites, and reactive fire-stopping devices tested to EN 1366-3, EN 1366-4, EN 13501-1, and EN 13501-2 standards. Products are manufactured under ISO 9001:2015 procedures and carry UKCA, CE, UL-EU, and IFC third-party certifications, with key brands including Pyrocoustic, Pyrolastic, PYROPRO, Stopseal, Silverliner (including the OSCB open-state cavity barrier range), PipeBloc, Silverseal, Flexi-Coat, NS Putty, S-Line, Pass-It, and Paraflam. In October 2023, the company consolidated sister brand Promat's UK fire-stopping portfolio under the FSi Promat brand, combining 88 years of experience across the two legacy brands.

Revenue is generated through direct hardware sales of fire-stopping and cavity-barrier products to architects, contractors, installers, facade contractors, and developers, supplemented by technical consultancy and specification services. Distribution is handled through the wholly-owned Firesafe & Sound logistics centre with next-day UK and same-day London delivery, plus channel-partner distributors in Ireland, the UAE, and the Netherlands. Pricing is quote-based and not publicly disclosed. The company targets early-stage specification via RIBA-accredited CPDs, ASFP seminars, a Product Selector App, and 2024-launched specification packs and online product training.

Name

FSI

Legal name

FSi Limited

Website

https://fsiltd.com

Company type

Private

Founded year

2000

Operating status

Operating

Headcount range

51–100 employees

Short description

FSi Promat is a UK-based manufacturer of passive fire protection products — including intumescent sealants, collars, wraps, coatings, mortars, and open-state cavity barriers — serving architects, contractors, and developers through its own Firesafe & Sound distribution network.

Ownership category

akta.pro rank

Product category

Passive Fire Protection Products

SIC

Chemicals & Allied Products (2800)

akta.pro primary industry

Firestopping & Fire-Resistant Sealants (IMADAOAI)

akta.pro secondary industries

Fireproofing & Intumescent Coatings (IMAIAKAH), Firestop & Penetration Sealing Materials (IMADAGAL)

Keywords

• Passive fire protection
• Fire stopping products
• Cavity barrier systems
• Intumescent sealants
• Penetration seals

Headquarters

HQ city

Measham

HQ country

United Kingdom

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Passive Fire Protection Products: Manufacture and sale of fire stopping products including sealants, batts, collars, wraps, pillows, coatings, and cavity barriers for the construction industry. Products are sold directly through Firesafe & Sound distribution center and through channel partner distributors.
2. Technical Support and Specification Services: Technical consultancy services including system consultancy, installation guidance, and specification pack support for architects and fire engineers.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels6 records

Core offering

FSi Promat manufactures passive fire protection products including fire stopping sealants, intumescent pipe collars and wraps, mineral wool batts and coatings, gypsum-based mortars, fire pillows, and open state cavity barriers for the construction industry. Products reinstate fire resistance of wall and floor constructions where joints and service penetrations exist, and protect building envelope voids in ventilated facades. The company manufactures in-house to ISO 9001:2015 standards, tests products to EN 1366-3, EN 1366-4, EN 13501-1, and EN 13501-2, and distributes through its Firesafe & Sound logistics centre offering next-day UK delivery.

Product overview

FSi Promat is a manufacturer of passive fire protection products, operating as part of the Etex Group. The company produces a comprehensive portfolio of fire stopping and cavity barrier systems for the construction industry. The product range is organized into three main categories: Penetration Seals (including sealants, coatings, coll ... raps, pillows, mortars), Linear Gap Seals (sealants for joints), and Cavity Barriers (for ventilated facades and external envelope protection). Core penetration seal products include Pyrocoustic® Sealant, Pyrolastic® Silicone, PYROSEAL 2K, PYROPRO® HPE, Pyropro® LST, Stopseal® Batt, Stopseal® Ablative Spray Coating, PS Coating, and Pyrocoustic® Trowel Grade. Pipe protection is provided through PipeBloc® PCP (collar), PipeBloc® EL (wrap on roll), and PipeBloc® PWP (wrap). Additional sealing solutions include NS Putty®, NS Putty® Pads, PenoPatch, S-Line® Pillows, Silverseal® HS Compound, Silverseal® Compound, and Pass-It® Transit. Cavity barriers include Silverliner® Open State Cavity Barrier (OSCB) and Paraflam® SEB, with Flexi-Coat® Coating offering flexible movement accommodation. Products are tested to EN and ISO standards, carry CE and UKCA marking, and are supported by the Firesafe & Sound distribution center offering next-day UK delivery.

Differentiator

Problem solved

Functional benefit

Products and services

• Pyrocoustic Sealant

Quantifiable outcome

• Water waste reduction of 550,000 liters per year through wastewater treatment system
• +2 more outcomes

Named customers1 record

Segments4 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Seven partnerships are on record, tiered core, major and minor.

• Firesafe & Sound LtdcoreImplementation/ SI/ Consulting PartnerFiresafe & Sound (FSS) is the distribution center and logistics team behind FSi Limited. Part of FSi Promat since 2000, FSS handles all customer service, order fulfillment, and delivery operations including next day UK delivery and same day London delivery.
• IFC CertificationmajorTechnology or IntegrationPartnership with IFC Certification to provide third-party certification for Silverliner OSCB products. This certification strengthens market position and provides independent verification of product performance and quality.
• PromatcoreStrategic or Co-development PartnerPromat and FSi have combined under the FSi Promat brand. Promat specializes in protective board solutions while FSi Promat handles fire stopping and cavity barriers. Both are part of Etex Group with 88 years combined experience.
• Tennants (Ireland)minorChannel Partner/ Reseller/ DistributorIrish distributor for FSi Promat fire stopping products in the Republic of Ireland.
• MHI (UAE)minorChannel Partner/ Reseller/ DistributorUAE-based distributor for FSi Promat fire stopping products in the Middle East.
• DFI Trading (Netherlands)minorChannel Partner/ Reseller/ DistributorDutch distributor for FSi Promat fire stopping products in the Netherlands.
• RIBA (Royal Institute of British Architects)majorStrategic or Co-development PartnerPartnership to deliver RIBA-accredited CPD courses for architects on passive fire protection, raising awareness of legislation and product types.

Scale indicators7 records

Recent moves7 records

Expansion highlights5 records

Direct peers

• Nullifire: Nullifire (Tremco CPG) is a leading UK-based manufacturer of intumescent firestopping sealants, coatings, and cavity barriers. Direct head-to-head competitor to FSi Promat across the same product categories, customer base (architects, contractors), and UK distribution model.
• Specified Technologies Inc (STI Firestop): STI is a US-headquartered specialist manufacturer of firestopping systems including sleeves, collars, wraps, and sealants. Comparable in product depth to FSi Promat, though with stronger North American presence. Direct product category overlap in penetration seals and intumescent technologies.

Broad incumbents

• Hilti: Hilti is a global construction product manufacturer with a substantial firestop product line, including sealants, collars, wraps, and modular transit systems. It directly competes with FSi Promat at the contractor and installer level, with particular strength in Pass-It Transit and PipeBloc-style solutions.
• Knauf: Knauf is a global manufacturer of drywall, insulation, and firestopping systems. Comparable to FSi Promat in combining fire protection products with broader construction materials, though Knauf's portfolio is significantly wider and includes the structural assemblies within which FSi's products are installed.
• Sika: Sika is a global specialty chemicals company with a construction sealants and firestopping product line. Its Sikaflex and Sika firestop products compete directly with FSi's Pyrocoustic, Pyrolastic, and PyroPro lines in penetration and linear gap seal applications.
• Würth: Würth is a global construction and industrial supplier with a firestopping product line including sealants, collars, and cavity barriers. Competes with FSi Promat at the contractor and installer level, leveraging its vast distribution network and tradesperson relationships.
• Rockwool: Rockwool is a global manufacturer of stone wool insulation and fire protection products, including firestopping and fire-rated cavity barriers. It competes with FSi in penetration and cavity barrier applications, particularly for stone wool-based products like Stopseal Batt and Silverliner core.
• BASF (MasterSeal / MasterFire): BASF's Master Builders Solutions brand offers MasterSeal and MasterFire firestopping products, including sealants, mortars, and intumescent systems. A broad incumbent chemical company competing with FSi Promat in chemical-based firestopping products, particularly in larger commercial construction projects.
• 3M Fire Protection: 3M manufactures a broad range of firestopping products including intumescent wraps, sealants, and putty products under the FireDam brand. A broader incumbent competing against FSi Promat in penetration seal applications, particularly in larger commercial and institutional projects.

Others

• Promat: Promat is FSi's sister brand within Etex Group, specializing in fire protective boards and high-temperature insulation. Following the 2023 FSi-Promat UK rebrand, Promat UK fire stopping products were transferred to FSi Promat, making them a directly aligned sibling brand rather than independent competitor.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/fsilimited
• Xx.com/FSiLimited

Compliance6 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles9 records

Subsidiaries1 record

Funding overview

Funding rounds

Investors

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

M&A

Investments

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

Frequently asked questions about FSI