When it comes to sealing concrete floor joints, trafficked areas and construction joints in commercial and industrial settings, the choice of sealant matters more than many people realise. Get it wrong and you face premature failure, costly remediation and – in the case of isocyanate-based products – potential health and safety complications for your workforce.
That’s why more construction professionals and flooring contractors are turning to HS66, a one-part hybrid flooring sealant engineered for performance, safety and ease of use, as Luke Chester from Hodgson Sealants explains …
What is HS66?
The HS66 is part of our HY-SPEC® Hybrid Sealants range – a line built on the latest polymer technology, combining the best properties of silicone and polyurethane without the drawbacks of either.
Designed specifically as a flooring sealant, the HS66 addresses a critical gap in the market: a high-performance product that handles the rigours of trafficked surfaces, including car parks, warehouses and production floors, while being completely solvent-free and isocyanate-free.
It is CE marked for use in pedestrian walkways, confirming it meets the required safety, health and environmental standards for professional construction use.
Where is HS66 used?
HS66 is formulated for demanding flooring environments, including:
- Internal and external construction joints – providing durable, flexible sealing in new builds and refurbishments
- Concrete floor joints – bonding effectively to porous substrates without the need for a primer on most surfaces
- Trafficked areas – car parks, warehouses and logistics facilities where abrasion resistance and durability are non-negotiable
- Saw cut joints – accommodating natural movement in concrete slabs with ±25% movement accommodation
This makes HS66 an ideal specification choice for civil engineering structures, commercial flooring projects and industrial facilities where downtime for maintenance is costly.
Why choose a hybrid sealant over polyurethane?
This is one of the most important questions facing specifiers and contractors right now – and the answer has become more pressing since August 2023.
Since that date, all professional and industrial users of polyurethane (PU) adhesives and sealants containing more than 0.1% total monomeric isocyanate concentration are legally required to complete mandatory training before use. This is because isocyanates are highly reactive compounds that can cause serious respiratory and skin sensitisation if not handled correctly.
HS66 contains no isocyanates. There is no training requirement, no additional compliance burden, and no added risk to your workforce or subcontractors. For busy contractors managing multiple trades on site, this is a significant advantage.
Hybrid sealants also offer several technical benefits over traditional PU products:
- No solvents – safer to apply in enclosed or poorly ventilated spaces
- Low VOC emissions – more environmentally responsible and compliant with increasingly stringent site requirements
- Excellent adhesion without primer – on most substrates, including concrete, metals, wood, glass, plastics and polycarbonate
- Paintable once cured – a practical advantage for floor finishing workflows
Key technical properties at a glance
| Property | HS66 Specification |
| Movement accommodation | ±25% |
| Application temperature | +5°C to +40°C |
| Skinning time | 15-20 minutes |
| Curing rate | Approx. 3mm per 24 hours |
| Shelf life | 12 months (unopened, cool & dry) |
| Available pack sizes | 310ml cartridge / 600ml foilpack sausage |
| Colours | White, Grey (paintable) |
| Isocyanate content | None |
| Solvent content | None |
Substrate compatibility
One of the standout practical benefits of HS66 is its wide substrate compatibility. It bonds effectively – without a primer on most surfaces – to:
- Concrete and masonry
- Unprimed metals, aluminium and steel
- Stainless steel
- Composite panels
- Wood
- Glass
- Plastics and polycarbonate
- Polyurethane (PU) substrates
Specification confidence: CE marking and technical documentation
HS66 carries CE marking, supported by a full suite of technical documentation including a Product Data Sheet (PDS), Safety Data Sheet (SDS) and Declaration of Performance (DOP). These documents are available to download directly from the HS66 product page, making specification and compliance straightforward.
For specifiers writing NBS clauses or product schedules, this level of documentation is increasingly expected – and HS66 delivers.
Where is HS66 made?
HS66 is manufactured in-house by Hodgson Sealants. With decades of experience in developing high-performance sealant solutions for construction, industry and fire protection, we’ve built a reputation for combining technical innovation with practical usability.
The HS66 reflects that philosophy: a product developed in response to real-world changes in health and safety legislation, designed to make the professional applicator’s job safer, simpler and more compliant – without compromising on performance.
Ready to specify HS66?
Whether you’re a contractor specifying flooring sealants for a new commercial build, a facilities manager sourcing maintenance products for trafficked floors, or a distributor looking to stock a certified hybrid sealant, HS66 is a product designed with your application in mind.
View the HS66 product page or contact the team.
