If you’re looking for a filoseal alternative uk, there’s a good chance you’re reviewing an older project specification, inherited framework document, or parts schedule that still names filoseal hd or similar sealing systems for cable ducts. This guide is intended for contractors, utilities and engineers who need an engineering duct sealing solution that works in practical site conditions, supports future modifications, and provides an effective seal against water ingress and potentially hazardous environments.
In simple terms, an effective duct sealing system should achieve three core objectives: create a durable watertight seal, cope with realistic cable configuration and cable scenario changes, and allow re entry when later works require teams to remove cables or remove cables or pipes without damaging the original installation.
Filoform to DuctSeal Conversion Table
Use this conversion table to align commonly referenced Filoform / FiloSeal product codes with DuctSeal alternatives for specification reviews, procurement planning, and ongoing maintenance requirements.
| Filoform / FiloSeal Product | Filoform Part Code | DuctSeal Equivalent | DuctSeal Code |
|---|---|---|---|
| FiloSeal+ 125mm | 282580 | DuctSeal LG 125mm | DSLG125 |
| FiloSeal+ 200mm | 282590 | DuctSeal LG 200mm | DSLG200 |
| FiloSeal HD 110mm | 280010 | DuctSeal HG 100mm | DSHG100 |
| FiloSeal HD 160mm | 280020 | DuctSeal HG 150mm | DSHG150 |
| FiloSeal HD 200mm | 280040 | DuctSeal HG 200mm | DSHG200 |
| FiloSeal HD 225mm | 280050 | DuctSeal HG 225mm | DSHG225 |
| FiloSeal HD 250mm | 280060 | DuctSeal HG 250mm | DSHG250 |
| FiloSeal HD Fire 110mm | 280070 | DuctSeal FR 100mm | DSFR100 |
| FiloSeal HD Fire 160mm | 280080 | DuctSeal FR 150mm | DSFR150 |
| FiloSeal HD Fire 200mm | 280100 | DuctSeal FR 200mm | DSFR200 |
| FiloSeal HD Fire 225mm | 280110 | DuctSeal FR 225mm | DSFR225 |
| FiloSeal HD Fire 250mm | 280120 | DuctSeal FR 250mm | DSFR250 |
What engineers typically need from duct sealing
Real installations are rarely tidy. In the field, engineers are often sealing active cable ducts in chambers, kiosks and service areas where:
- actual cable fill differs from the drawings
- large power cables are grouped with communication cables
- more than one service may occupy a single bore
- ducts can include pipes within pipes
- networks have changed over time through upgrades and repairs
That’s why many modern raceway seals are chosen as adaptable engineered systems rather than rigid one-size approaches—solutions capable of handling multiple duct diameters, variable cable fill, and mixed services within the same opening.
DuctSeal as a practical alternative (MEKO-free and designed for re-entry)
While some older products are associated with a single installation style, modern duct seal products are expected to offer both dependable sealing and straightforward repeat installation. DuctSeal is designed as an engineered universal solution with easy installation and quick and easy installation in mind, especially where routine access and easy re entry are important.
MEKO-free formulation: DuctSeal is MEKO-free. This is useful where procurement teams and site managers work to restricted-substance requirements, carry out COSHH assessments, and need to observe chemical resistance based on installation environment and exposure conditions.
Re-enterability: why it matters
One of the most common legacy search terms in this market is filoseal hd re enterable or enterable duct systems. That wording appears so often because sealed ducts rarely remain unchanged forever. Infrastructure grows, services are replaced, and cable routes are revised. A re-enterable system turns sealing into something maintainable, rather than a one-off installation that must be broken out every time access is needed.
Re-enterability also delivers a genuine lifecycle benefit. It helps reduce hidden maintenance costs that usually appear after handover, including additional labour, repeat access arrangements, shutdown risks, and delays linked to reopening a penetration that was never designed for future changes.
In day-to-day terms, re-enterability means installers can carry out re entry works, safely remove cables, introduce new services, and then restore the seal to the required standard without cutting away hardened materials or rebuilding the entire penetration. This becomes even more important where there are several cables, mixed sheath constructions such as pe sheathed cables, or both services and pipes located in one duct.
Why re-enterability supports long-term performance
- Planned network expansion: updates in cable configuration can be handled without rebuilding the duct entry.
- Maintenance and fault response: quicker reinstatement without disruptive breakout work.
- Consistency across sites: re-enterable sealing systems can reduce variation between crews and lower the risk of poor reinstatement.
- Protects the penetration: non-destructive access helps preserve the integrity of the duct sealing system over time.
Re-enterability also supports key sealing objectives such as control of water ingress and preservation of a watertight seal. Each time a duct is reopened and resealed with non-re-enterable materials, the likelihood of voids, incomplete bonding, or rushed repairs increases—particularly in difficult or wet conditions.
Chemical resistance and hazardous environments
On many infrastructure sites, seals are exposed to more than just moisture. Duct sealing products may need proven chemical resistance and to be chemical agents resistant because chambers, pits and industrial service areas may contain oils, alkaline water, or process-related gases.
Where the environment includes flammable gases, ex zones, chlorine gas, methane, or hydrogen sulphide, choosing a system that is resistant to hydrogen sulphide may be essential. Some specifications also refer to exposure under ASTM oil conditions or water alkaline chemical agents.
DuctSeal is supplied as a one component system developed as a flexible one component adhesive and adhesive and sealing compound in a single application method. In practical terms, that means one sealing compound performing like a plastic elastomer mass, delivering water tightness excellent adhesion and secure bonding around common cable and pipe sheath materials.
Water performance: watertightness, pressure and typical duct conditions
For many projects, the primary requirement is a dependable watertight seal that prevents water ingress. Some installations may be specified for lower pressure conditions such as 1 bar pressure, although project conditions and actual duct state should always be confirmed.
In practice, the system should offer special qualities effectively sealing around uneven cable bundles, retain water tightness excellent adhesion, and remain serviceable if future works require service changes inside the duct.
Installation approach: bore holes, transit frames, kits and retrospective work
Cable duct sealing does not always take place on a clean new-build project. A large proportion of work involves bore holes or existing penetrations that need sealing later, including systems installed retrospectively in chambers, walls, basements, cabinets or live duct entries.
Depending on the application, services may also pass through transit frames. A practical solution should be supplied as a complete kit so installers can work consistently on site, and it should support easy installation without specialist equipment.
DuctSeal is regularly installed using a component adhesive and sealing method (also described as component adhesive and sealing compound) where the same material provides both sealing and bonding performance.
Operational conditions: temperature and long-life performance
For engineering approval, it is important to check operating temperature ranges and verify that the selected product remains stable in wet, contaminated, or chemically aggressive environments over the long term.
Some projects also include compliance wording such as WIMES compliant where relevant to the specification and available product evidence. Any compliance references should always be checked against the latest documentation for the exact product, test scope and application.
Why teams switch from other sealing systems
When reviewing legacy specifications, many engineers look for a universal solution that can work across a wider range of site conditions instead of relying on other sealing systems that may be harder to re-enter, inconsistent in installation, or less suitable for mixed service penetrations.
A combination of easy re entry, repeatable placement, and a single compound-based approach can help improve consistency and reduce remedial work on site.
Notes engineers sometimes search
You may still come across search strings such as nec articles 225.27 230.8 and grouped references like articles 225.27 230.8 300.5 or nec articles 225.27 230.8 300.5. In some records, this also appears as 225.27 230.8 300.5 g and 230.8 300.5 g 300.7. These terms often show up in historic documentation and can help confirm you are tracing the correct legacy product line or schedule item.
Summary: choosing the right duct seal for cables and pipes
When converting an older specification, the selection process comes down to a few practical questions. What is the diameter and condition of the duct? Are you sealing cable ducts carrying only cables, or are pipes present as well? Are there exposure conditions that mean you need to consider chemical resistance or a more clearly chemical agents resistant solution? And do you need future flexibility so teams can remove cables or pipes and restore the seal without damaging the penetration?
Where the requirement includes re-enterability, dependable water performance, and durable sealing around common cable sheath types, DuctSeal is positioned as a practical, contractor-friendly option that combines straightforward installation with long-term serviceability.
Related: DuctSeal LG | DuctSeal HG | DuctSeal FR
FAQs
What is the best filoseal alternative uk for cable ducts?
The right alternative will depend on duct size, service fill, and whether the application needs heavy-duty or fire-resistant performance. The conversion table above is a useful starting point, but final selection should also consider duct condition, cable or pipe layout, and any site-specific environmental requirements.
Does a re-enterable duct sealing system help future upgrades?
Yes. A re-enterable system supports later modifications by allowing re entry works to remove cables, add services and reseal the penetration without destructive removal methods.
Do duct sealing systems need chemical resistance?
In many utility, water and industrial environments, chemical exposure is a real consideration. Chemical resistance requirements should always be reviewed where oils, alkaline water, or industrial gases could be present.