About STP ShaliFloor 2E SF

STP ShaliFloor 2E SF sits in the “underlay” tier of an industrial epoxy floor build-up, the layer that does the unglamorous but critical work of turning a rough, out-of-level concrete slab into a flat, sound platform. It is a two-part epoxy binder, a resin base and a hardener, that is combined on site with Extender 36, STP’s non-toxic silicon-dioxide aggregate supplied in graded medium-to-fine particle sizes. The aggregate is what makes the system economical: instead of pouring an expensive pure-resin screed at full depth, you extend the epoxy with inert silica so each square metre of 2-4 mm build costs far less while still delivering a compressive strength above 50 MPa.

The product is aimed squarely at contractors and applicators who need to correct a slab before laying a finish coat. Warehouse floors that have settled unevenly, manufacturing bays with worn or patchy surfaces, and new slabs that simply were not power-floated flat enough all benefit from a levelling underlay of this kind. Because it self-levels, it also removes the need for a screed-laying machine on smaller or awkward areas, the material flows out under its own weight to a smooth plane. Space Arc Engineering supplies ShaliFloor 2E SF across Delhi NCR and Pan-India, and we can pair it with the right primer and STP topcoat so the full flooring stack is specified as one compatible system rather than mismatched layers.

The technical insight

The performance of an extended epoxy underlay comes down to the binder holding a tightly packed skeleton of aggregate. When the base and hardener are mixed, the epoxy cross-links into a rigid, chemically resistant matrix; the Extender 36 silica particles, graded from medium to fine, pack together to carry the compressive load while the resin bonds them into a monolith and glues the whole layer to the primed slab. That is why the system reaches over 50 MPa in compression despite being mostly inert filler, the load path runs particle-to-particle, with the epoxy resisting the shear and tension between them. Self-levelling behaviour comes from the resin’s controlled viscosity: fluid enough to flow out and release entrapped air, yet bodied enough by the aggregate to hold a 2-4 mm build without draining to the low spots. The trade-off is a working window, the pot life of roughly 20-30 minutes at 25 degrees C is the clock, once the exotherm starts the mix stiffens and can no longer flow, so mixing quantity, placing speed and floor temperature all have to be managed together.

Where it is used

• Levelling and building up industrial concrete floors from 2 to 4 mm before an epoxy topcoat
• Economical base coat for warehouse and logistics-centre floors
• Surface correction on manufacturing and production-shed slabs
• Filling undulations and re-establishing an even plane on worn or settled floors
• Preparing a sound, flat substrate for decorative or heavy-duty epoxy finishes
• Levelling awkward or smaller areas where a screed-laying machine is impractical
• Base build-up under high-traffic industrial coatings needing a strong underlay
• Bringing new, out-of-tolerance slabs up to a flat finish ahead of topcoating

Key advantages

• Economical per square metre because the epoxy is extended with Extender 36 silica rather than poured as pure resin
• Self-levelling flow gives a smooth, even base without a screed machine
• High compressive strength above 50 MPa for a load-bearing industrial underlay
• Rigid epoxy matrix provides a sound, well-bonded substrate for the topcoat
• Good chemical resistance from the epoxy binder
• Adjustable build in the 2-4 mm range to correct varying levels
• Pre-weighed components reduce site mixing errors and give consistent results
• Compatible within the STP ShaliFloor system so the full stack can be specified together

Limitations & considerations

• It is an underlay, not a wearing surface, and must be finished with an epoxy topcoat rather than left exposed
• Short pot life of roughly 20-30 minutes at 25 degrees C demands quick, well-planned placing
• Being epoxy, it is moisture-sensitive during cure and needs a dry, correctly prepared slab
• Higher ambient temperatures shorten working time further and can trap air if not managed
• Requires mechanical surface preparation and a suitable primer for the bond to develop
• Not intended for large-thickness screeds beyond its stated build range in a single pass

Selection & best practice

Specifications

Industry use cases

How we position STP ShaliFloor 2E SF

ShaliFloor 2E SF is the economical, extended-epoxy underlay in STP’s ShaliFloor flooring family, use it where cost-per-square-metre matters and the levelling depth sits in the 2-4 mm range. Within the same STP range, step up to ShaliFloor SL UL 2ES (a quartz-sand-filled 2K underlay) or the three- and four-component ShaliFloor SL UL 3 ES and ShaliFloor Screed systems when you need higher build or a specific pre-weighed screed, and finish any of them with an STP ShaliFloor SL topcoat. For a decorative or heavy-duty wearing coat over this underlay we also supply Fosroc Nitoflor and Sika Sikafloor systems, so the topcoat can be matched to the client’s chemical and traffic demands rather than to whatever underlay was laid.

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