STP ShaliFloor SL AS 3EPU
A three-component epoxy-polyurethane self-levelling floor that drains static charge safely to earth while staying seamless, chemical-resistant and easy to clean.
What is it?
A 3K (resin, hardener, solid extender) epoxy-polyurethane self-levelling top coat that forms a monolithic, non-porous anti-static dissipative floor with a surface resistivity in the 10^6-10^9 ohm band.
Where is it used?
ESD-sensitive spaces such as electronic assembly areas, pharma clean zones, hospitals and operation theatres, plus abrasion-heavy industrial, food and automotive floors.
Why use it?
It bleeds off static build-up to protect components and people, and combines that with the flexibility, seamlessness and chemical resistance of a PU-modified epoxy that pure epoxy anti-static floors lack.
How is it applied?
Laid as a full system: ShaliPrime 2E SF primer, a 2 mm ShaliFloor SL UL 3ES base coat, a copper-strip earthing grid, a ShaliPrime 2E ASC conductive prime, then the 1-2 mm SL AS 3EPU dissipative top coat.
About STP ShaliFloor SL AS 3EPU
STP ShaliFloor SL AS 3EPU is the static-dissipative member of STP Limited’s ShaliFloor EPU family, and it is engineered for one job: keeping stray electrostatic charge from ever reaching a level that damages sensitive electronics or triggers a spark in a controlled environment. Rather than a single coating, it is a built-up system. A solvent-free primer wets out the prepared concrete, a 2 mm self-levelling underlay (ShaliFloor SL UL 3ES) creates the body of the floor, a copper earthing grid is embedded, a conductive prime (ShaliPrime 2E ASC) ties the network together, and the SL AS 3EPU top coat is flow-applied over it at 1-2 mm. The result is a jointless, hygienic surface that reads a controlled surface resistivity of N x 10^6 to N x 10^9 ohms and clears a static charge in roughly 0.03-0.05 seconds.\n\nWhat separates it from a conventional anti-static epoxy is the polyurethane modification in the chemistry. That PU content gives the film more flexibility and better resistance to micro-cracking under thermal and mechanical movement, while retaining the hardness (Shore D of 60 or above) and abrasion resistance a working floor demands. It cures to a semi-gloss finish, is available in a wide colour range, and can carry an optional aliphatic ShaliFloor TC 2PU seal coat of 60-70 microns where UV colour retention matters. For Indian projects, Space Arc Engineering supplies and applies the complete system, so the specification, earthing detail and post-installation resistance testing are handled as one accountable scope.
The technical insight
Static dissipation is not about insulating a floor or making it a bare conductor; it is about landing the resistance-to-earth in a deliberate window. SL AS 3EPU sits in the dissipative band of N x 10^6 to N x 10^9 ohms (verified to BS 2050 and ASTM D 257). That range is high enough to slow the discharge so a person or component never sees a sudden spike, yet low enough that charge always finds a path to ground instead of accumulating. The path itself is the embedded copper-strip grid laid at roughly one-metre centres in both directions, run to within about 150 mm of the walls, and connected out to the building earth at one end of the room. The conductive ShaliPrime 2E ASC beneath the top coat is what electrically couples the whole floor plane to that grid, which is why the layer sequence cannot be shortcut. The polyurethane-modified epoxy binder then does the mechanical work: it stays dense and pore-free so contaminants and static-generating dust cannot lodge, and its measured static decay of 0.03-0.05 seconds confirms the film moves charge fast enough for electronics-grade and clean-room duty.
Where it is used
- Electronic assembly, PCB and semiconductor production areas where ESD would destroy components
- Pharmaceutical clean rooms and manufacturing suites needing hygiene plus static control
- Hospital operation theatres and critical-care areas requiring spark-free, easily sanitised floors
- Data centres, server rooms and control rooms with sensitive equipment
- Defence, ammunition-adjacent and aerospace electronics handling zones
- Food, beverage and commercial kitchen floors needing a seamless, washable finish
- Automobile assembly lines, workshops and showroom floors
- General industrial floors demanding high abrasion resistance with dust-proofing
Key advantages
- Delivers a controlled dissipative resistivity of 10^6-10^9 ohms with a 0.03-0.05 second static decay
- PU-modified chemistry gives more flexibility and crack resistance than a plain anti-static epoxy
- Self-levelling flow produces a seamless, jointless surface that is genuinely easy to clean
- Hard-wearing: Shore D of 60 or more and low abrasion loss (about 80 mg, CS17 / 1000 cycles)
- Non-porous and hygienic, so dust and contaminants have nowhere to settle
- Good resistance to chemicals, oils and water for demanding process environments
- Available in a wide colour range with an optional UV-stable TC 2PU top seal
- Backed by BS 2050 and ASTM D 257 conformity for specification confidence
Limitations & considerations
- ESD performance depends entirely on correct copper-strip earthing and connection to building earth; poor detailing voids the anti-static benefit
- Colour can fade over time in areas exposed to direct sunlight unless the aliphatic ShaliFloor TC 2PU protective coat is applied
- It is a multi-layer specialist system, not a single-coat paint, so it needs skilled application and adds programme time
- Requires fully cured concrete (minimum 28 days old) and a properly prepared, moisture-controlled substrate
- Foot traffic only after 60-72 hours and full cure at 7 days, so the area must be programmed out of use
- Once a pack is opened the full quantity must be used, as the pre-batched three components cannot be part-mixed reliably
Selection & best practice
Success starts with the substrate: the concrete must be at least 28 days old, mechanically ground or abraded smooth, and free of oil, dust and laitance. Set out the copper earthing grid before the conductive layers go down, sticking self-adhesive strips at one-metre centres lengthwise and breadthwise, running them about 150 mm off the walls, and leaving one strip extended at a room end for the earth connection. Follow the layer order without shortcuts: ShaliPrime 2E SF primer (surface-dry in 6-10 hours), the SL UL 3ES base coat at 2 mm (leave 12 hours minimum), then the copper strip, then ShaliPrime 2E ASC over it, and finally the SL AS 3EPU top coat at 1-2 mm. Mix resin (A) with the solid extender (C) first to a homogeneous blend, add hardener (B) slowly, mix a full 5-10 minutes, then wait about 5 minutes to release entrapped air before pouring — pot life is only 40-60 minutes at 27 C. Allow 72 hours before use, clean tools immediately with ShaliPoxy Thinner, and always verify the installed floor’s resistance-to-earth by testing before handover.
Specifications
| Product type | 3K epoxy-polyurethane self-levelling anti-static dissipative top coat |
| Components | A = liquid resin, B = liquid hardener, C = solid extender |
| Top coat thickness | 1-2 mm (over a 2 mm SL UL 3ES base coat) |
| Surface resistivity | N x 10^6 to N x 10^9 ohms (dissipative), to ASTM D 257 / BS 2050 |
| Static decay | 0.03-0.05 seconds |
| Top coat coverage | 1.8-1.9 kg/m2/mm (primer 240-300 gm/m2; base coat 3.2-3.6 kg/m2/2 mm) |
| Pot life / full cure | 40-60 min at 27 C; foot traffic 60-72 hrs; full cure 7 days |
| Shore D hardness / abrasion | >=60 (7 days); ~80 +/- 20 mg loss (CS17, 1000 cycles) |
| Packaging / shelf life | Top coat 14 kg (4.72+2+7.28), conductive primer 10 kg; 12 months at 5-40 C |
Industry use cases
Electronics & Semiconductors
Assembly, PCB and semiconductor lines rely on the 10^6-10^9 ohm band and fast static decay to protect components from ESD damage during handling and production.
Pharmaceutical & Healthcare
Clean rooms, manufacturing suites and operation theatres get a seamless, non-porous, easily sanitised floor that controls static without harbouring contaminants.
Data Centres & Control Rooms
Server halls and control rooms use the dissipative surface to protect sensitive equipment and keep static from disrupting operations.
Defence & Aerospace
Electronics assembly and ammunition-adjacent handling areas specify the earthed dissipative system for spark-safe, static-controlled floors.
Food, Beverage & Automotive
Kitchens, beverage plants and vehicle assembly floors benefit from the seamless, abrasion- and chemical-resistant finish alongside static control.
Frequently asked questions
Is SL AS 3EPU conductive or dissipative?
Why does it need copper strips and earthing?
How thick is the finished floor?
How is it different from a standard anti-static epoxy?
Will the colour stay stable in daylight?
How long before the floor can be used, and who installs it?
How we position STP ShaliFloor SL AS 3EPU
Within STP’s own range, SL AS 3EPU is the dissipative, PU-modified upgrade over the epoxy-based ShaliFloor 3E SL ASC (conductive) and sits alongside ShaliFloor SL 3EPU, the non-anti-static solventless EPU topping for standard industrial floors. It is built on ShaliFloor SL UL 3ES as its base coat and pairs with ShaliPrime 2E SF, ShaliPrime 2E ASC and the ShaliFloor TC 2PU seal to complete the system. Where a project is Fosroc-specified, the closest equivalents from our Fosroc range are Nitoflor EPU Conductive & Dissipative (the direct epoxy-PU hybrid match) and the epoxy-based Nitoflor SL Conductive / Dissipative; for a pure-PU heavy-duty ESD floor, Nitoflor SL3000 U ESD is the alternative. Talk to Space Arc about matching resistance-to-earth targets and the correct grade for your clean-room, electronics or process environment.
Fosroc Nitoflor EPU Conductive & Dissipative — A specifier locked to the Fosroc system, or wanting the Nitoflor track record for a QA-critical electronics or clean-room floor, would choose this direct epoxy-PU hybrid ESD counterpart.
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