STP ShaliFloor SL 3EPU
A three-component solventless epoxy-polyurethane self-levelling topping that marries epoxy hardness with polyurethane flexibility for resilient, seamless industrial floors.
What is it?
A 3K (three-component) solventless epoxy-polyurethane hybrid self-levelling pigmented floor topping from STP, laid at 1-2 mm to give a jointless, resin-rich wearing surface.
Where is it used?
Warehouses, light-chemical process areas, cold stores, and commercial or institutional floors that need a tough yet slightly forgiving finish.
Why use it?
The polyurethane content adds flexibility and impact tolerance that pure epoxy toppings lack, so the floor resists thermal movement and dropped-load cracking while still exceeding 55 MPa in compression.
How is it applied?
The base, hardener and pigment pack are batch-mixed on site, poured onto a primed, mechanically prepared substrate, spread to gauge and spike-rolled to de-aerate into a self-smoothing film.
About STP ShaliFloor SL 3EPU
STP ShaliFloor SL 3EPU sits in the middle ground between a thin decorative epoxy coating and a heavy-duty screed. It is a three-component, 100% solids system: an epoxy-polyurethane resin base, a co-reactive hardener and a pigment component that are combined on site and flowed onto the floor to self-level at 1-2 mm. Because it carries no solvent, there is nothing to flash off during cure, which means no VOC load, minimal shrinkage and a system that can be laid in enclosed or occupied buildings where ventilation is limited. The cured film is a dense, non-porous, monolithic surface that is easy to wash down and keep hygienic.
What sets this product apart from a conventional self-levelling epoxy is the polyurethane chemistry built into the resin. Straight epoxy toppings are hard and chemically resistant but brittle, so they can micro-crack under thermal cycling or the shock of dropped loads. By hybridising with polyurethane, ShaliFloor SL 3EPU keeps the compressive strength (over 55 MPa) and chemical resistance of epoxy while gaining meaningful flexibility and impact absorption. For a specifier that is choosing a floor for a cold store, a busy warehouse aisle or a light process area, that extra give is often the difference between a floor that lasts and one that spider-cracks in its first season.
The technical insight
The performance comes down to how the two resin families cross-link. Epoxy contributes a tightly bonded, aromatic network that delivers hardness, adhesion and resistance to acids, alkalis and many solvents. Polyurethane contributes softer, more elastic segments into the same cured matrix, which lets the film flex slightly and dissipate impact energy instead of transmitting it as a crack. Blended in a single self-levelling system, you get a floor that behaves like a toughened epoxy rather than a glassy one. The solventless, 100%-solids formulation matters here too: with no carrier solvent evaporating, the film cures at close to its applied thickness with very low shrinkage stress, so the bond to the substrate and the internal integrity of the 1-2 mm layer are both preserved. That is why the material can hold a dense, pore-free surface that shrugs off wash-down chemicals and forklift traffic.
Where it is used
- Warehouse and distribution floors carrying pallet and forklift traffic
- Cold stores and chilled areas where the floor sees thermal cycling
- Light and moderate chemical process floors
- Food, beverage and pharmaceutical support areas needing a washable, non-porous finish
- Commercial and institutional floors such as workshops, plant rooms and service areas
- Assembly and packing halls that need a seamless, easy-clean surface
- Areas subject to occasional dropped loads or mechanical impact
- Occupied or poorly ventilated buildings where a zero-VOC system is required
Key advantages
- Hybrid epoxy-polyurethane chemistry gives higher flexibility and impact tolerance than pure epoxy toppings
- Over 55 MPa compressive strength for heavy foot and light vehicular traffic
- Self-levelling flow produces a smooth, jointless, monolithic finish
- 100% solids, solventless and zero-VOC, so it can be laid in enclosed or occupied spaces
- Dense, non-porous surface that is hygienic and easy to wash down
- Good chemical resistance to routine spillage in process environments
- Better resistance to thermal-movement and impact micro-cracking, useful in cold stores
- Pigmented system delivers a uniform coloured floor without a separate top coat
Limitations & considerations
- Rated for good-to-moderate chemical exposure, not aggressive acid or solvent immersion — heavy chemical duty needs a specialist screed
- At 1-2 mm it is a topping, not a structural repair layer; deep damage or falls must be corrected first
- Being a three-component pour, it has a limited pot life once mixed and demands accurate, disciplined batch mixing
- Substrate must be sound, dry and mechanically prepared with the correct primer, or adhesion and finish suffer
- Epoxy-based resins can amber or yellow under strong UV, so it is intended for interior floors
- Application quality is installer-dependent — poor de-aeration or over-thinning shows up as pinholes or uneven gloss
Selection & best practice
Treat the substrate as the make-or-break step. The concrete should be structurally sound and cured, with surface laitance removed by shot-blasting or diamond grinding to expose a clean, open profile, and moisture within the manufacturer’s limit before priming. Prime with the recommended STP primer and let it tack off. Mix the three components in full, factory-supplied ratios using a slow-speed paddle — never split-batch by eye — and only mix what the team can lay within pot life. Pour, spread to the 1-2 mm gauge with a notched trowel or pin rake, then spike-roll promptly to release entrained air and let it flow out level. Protect the fresh floor from dust, foot traffic and temperature swings during cure, and keep the working area within the specified temperature band so the resin flows and cures predictably.
Specifications
| Product type | 3K (three-component) epoxy-polyurethane self-levelling topping |
| Chemistry | Solventless epoxy-polyurethane hybrid, pigmented |
| Solids content | 100% (solventless) |
| VOC | Zero |
| Application thickness | 1-2 mm |
| Compressive strength | >55 MPa |
| Flexibility | Higher than pure epoxy |
| Finish | Smooth, self-levelled, non-porous |
| Use area | Interior industrial and commercial floors |
Industry use cases
Warehousing & Logistics
Seamless, over-55-MPa surface that takes forklift and pallet-truck traffic while resisting impact from dropped loads in busy aisles.
Cold Storage
The polyurethane flexibility helps the floor absorb thermal cycling in chilled and cold rooms where brittle epoxy toppings tend to micro-crack.
Food & Beverage Support Areas
Non-porous, washable finish suits packing, storage and light process zones that need frequent hygienic clean-down.
Light Chemical Process Floors
Good-to-moderate chemical resistance handles routine spillage in workshops and light manufacturing without an aggressive-duty screed.
Institutional & Commercial
Zero-VOC, solventless formulation lets the floor be laid in occupied plant rooms, service areas and institutional buildings with limited ventilation.
Frequently asked questions
How is ShaliFloor SL 3EPU different from a normal self-levelling epoxy floor?
What thickness is it laid at, and is that enough for heavy traffic?
Is it safe to apply in an occupied or poorly ventilated building?
What kind of chemical exposure can the floor take?
Why is it a three-component product and does the mixing matter?
Can Space Arc supply and apply it, and does it come in colours?
How we position STP ShaliFloor SL 3EPU
Within STP’s own ShaliFloor flooring family, SL 3EPU is the flexible mid-build workhorse. If a project needs static-dissipative protection for electronics or explosive-atmosphere areas, its sister product ShaliFloor SL AS 3EPU adds anti-static performance in the same self-levelling format. Where the requirement is a thicker, higher-duty industrial screed rather than a 1-2 mm topping, STP’s heavier ShaliFloor epoxy screeds are the better fit. Across our other brands, teams standardising on Fosroc’s Nitoflor range, or on MC-Bauchemie and Sika flooring systems, can request an equivalent hybrid or epoxy self-levelling topping — we cross-reference by thickness, strength and chemical duty so the spec, not the label, drives the choice.
Fosroc Nitoflor SL2000 — Choose the Fosroc self-smoothing epoxy topping when the project is standardised on Fosroc and needs a 2 mm hygienic floor for clean rooms, labs or food-grade areas rather than the added polyurethane flexibility of the STP hybrid.
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