Sika Sikafloor-161
A low-viscosity, two-component epoxy primer that soaks into concrete pores and gives Sikafloor resin systems the bond strength they were designed to deliver.
What is it?
A two-part, solvent-free, low-viscosity epoxy resin used to prime concrete and cement screeds before Sika resin flooring, and as a binder for levelling mortars.
Where is it used?
Industrial floors, warehouses, workshops, pharma and food plants, parking decks and any concrete slab receiving an epoxy or PU topping.
Why use it?
It penetrates the substrate, seals pores and locks out air, so the topcoat bonds mechanically instead of blistering, pinholing or peeling later.
How is it applied?
Mix Part A and Part B in the supplied ratio, apply by roller or squeegee onto a mechanically prepared slab at 0.25 to 0.55 kg per square metre, then overcoat within the curing window.
About Sika Sikafloor-161
Sikafloor-161 is one of the most widely specified priming resins in the Sika flooring range, and for good reason. It is an economical, two-component epoxy with very low viscosity, formulated to wet out and penetrate concrete rather than sit on top of it. On a typical Indian job site that means it works its way into the open pore structure of a shot-blasted slab, displaces trapped air and creates a sound, sealed platform for whatever self-levelling or coating system follows. The tropical-climate grade is built to behave predictably in the heat and humidity that most of our projects contend with, which is why consultants keep coming back to it for factory and warehouse floors.
Beyond straight priming, Sikafloor-161 doubles as a binder. Blended with Sikadur-504 quartz filler it becomes a levelling mortar or a self-smoothing intermediate layer, so the same drum can prime a slab, patch a shallow depression and build a scratch coat before the finish goes down. That versatility keeps the material list short and the logistics simple. As an authorised Sika distributor and applicator covering Delhi NCR and pan-India, Space Arc supplies it in ready-to-mix 5 kg, 20 kg and 25 kg units and can advise on the right topcoat pairing for your floor loading and exposure.
The technical insight
The whole value of a primer lives in the interface it creates, and Sikafloor-161 is engineered for exactly that. Its low mixed viscosity is the mechanism: a thin, mobile resin flows into the capillaries and micro-cracks of the concrete before it gels, then cures into a continuous polymer that is mechanically keyed into the slab. That anchorage is what lets the system develop a pull-off adhesion greater than 1.5 N/mm2 with failure occurring in the concrete itself rather than at the bond line, meaning the primer is stronger than the substrate it is holding. At the same time it seals the surface, so moisture vapour and air cannot rise through the fresh topcoat and form pinholes, blisters or outgassing craters, the most common and most expensive way a resin floor fails on day one.
Where it is used
- Priming low to medium absorbent concrete slabs and cement screeds before resin flooring
- Primer beneath Sikafloor-263 SL and Sikafloor-264 self-levelling epoxy floors
- Primer for the Sikalastic-800 series waterproofing broadcast system
- Binder for fine and medium levelling mortars when blended with Sikadur-504 quartz
- Self-smoothing intermediate layer from 1.5 to 3 mm build
- Bonding bridge over old and new concrete before toppings
- Sealing and dust-proofing prepared concrete ahead of a coating
- Surface preparation for quartz broadcast and ESD flooring build-ups
Key advantages
- Very low viscosity for deep penetration and reliable wetting of the substrate
- Excellent bond strength, with pull-off failure in the concrete rather than the interface
- Solvent-free composition at roughly 100 percent solids, so no solvent flash-off delays
- Formulated for hot and tropical climates typical of Indian sites
- Multi-purpose, working as primer, mortar binder and intermediate layer from one product
- Short waiting times keep the flooring programme moving
- Available in convenient 5 kg, 20 kg and 25 kg ready-to-mix units
- Carries EN 1504-2 and EN 13813 conformity and LEED low-emitting credentials
Limitations & considerations
- Pot life is short in Indian heat, around 15 minutes at 30 degrees C, so mix only what can be laid quickly
- Substrate must be mechanically prepared by blasting or scarifying and reach a concrete surface profile that exposes an open texture
- Not a standalone wearing surface, it is always a primer or interlayer beneath a Sika topcoat
- Sensitive to moisture, requiring below 4 percent by CM method and no rising damp before application
- Requires strict overcoating within the stated window or the surface may need re-preparation
- Slow to cure and long in pot life the colder it gets, needing a substrate at 10 degrees C minimum
Selection & best practice
Start with a mechanically prepared slab: abrasive blast or scarify to strip laitance and open the pore structure, then vacuum clean so no dust remains. Confirm the concrete is sound at a minimum 25 N/mm2 compressive strength with 1.5 N/mm2 pull-off, and check moisture is below 4 percent by CM method with no rising damp. Mix the full A and B units together mechanically at low speed for even colour, decant, and only combine what your team can apply inside the pot life, which shrinks to roughly 15 minutes at 30 degrees C. Work it into the surface by roller or squeegee at 0.25 to 0.55 kg per square metre; a very porous slab may need a second coat. Keep the substrate and floor at least 3 degrees C above dew point to avoid condensation and blooming, then overcoat strictly within the curing window, allowing about 12 hours at 20 degrees C before a solvent-free topcoat.
Specifications
| Composition | Two-component epoxy resin, solvent-free |
| Mixing ratio | Part A : Part B = 79 : 21 by weight |
| Density (mixed) | ~1.4 kg/L at +23 degrees C |
| Priming consumption | 0.25 to 0.55 kg/m2 per coat (1 to 2 coats) |
| Pot life | ~50 min at +10 C, ~25 min at +20 C, ~15 min at +30 C |
| Tensile adhesion strength | >1.5 N/mm2 (failure in concrete, ISO 4624) |
| Substrate compressive strength (min) | 25 N/mm2, pull-off min 1.5 N/mm2 |
| Overcoating time (solvent-free) | ~12 h at +20 C (min), 24 h at +10 C |
| Standards / packaging | EN 1504-2 & EN 13813; 5 kg, 20 kg, 25 kg ready-to-mix units |
Industry use cases
Warehousing & Logistics
Primes large distribution-centre slabs before Sikafloor-263 SL, sealing the concrete so forklift-rated toppings bond without pinholing.
Pharma & Food Processing
Creates the sound, sealed base for hygienic self-levelling floors where a failed bond or outgassing blister is not acceptable.
Manufacturing & Workshops
Doubles as a levelling-mortar binder with Sikadur-504 to patch and true up worn factory slabs ahead of a resin finish.
Parking & Podium Decks
Acts as primer and bonding bridge under Sikalastic-800 series broadcast waterproofing systems on trafficked decks.
Retrofit & Refurbishment
Serves as a bonding bridge between old and new concrete during floor rehabilitation before the topping is laid.
Frequently asked questions
What exactly is Sikafloor-161 used for?
How much Sikafloor-161 do I need per square metre?
What is the pot life on an Indian site?
What is the mixing ratio?
How soon can I apply the topcoat over the primer?
Can it be used on a damp or fresh slab?
How we position Sika Sikafloor-161
Sikafloor-161 is the workhorse primer that sits under Sika’s most-used resin floors, so it is naturally specified alongside Sikafloor-263 SL and Sikafloor-264 self-levelling epoxy toppings, the Sikalastic-800 series for deck waterproofing, and Sikadur-504 quartz filler when you need a levelling mortar or scratch coat. If your slab holds residual moisture, a moisture-tolerant epoxy primer is the safer call. Where a specifier prefers the Fosroc system, our Nitoprime range plugs into Nitoflor toppings and Nitocote coatings the same way. Space Arc stocks all of these across Sika, Fosroc, Dr. Fixit and MC-Bauchemie, so we can match the primer to the exact topcoat and site condition rather than force a single brand.
Fosroc Nitoprime 25 — Choose the Fosroc Nitoprime 25 when the floor build-up is a Fosroc Nitoflor or Nitocote system, or when a slightly damp-tolerant solvent-based epoxy primer suits the site better.
Related Industrial Flooring products
Source Sika Sikafloor-161 for your project
Authorised distribution, technical advice & professional application across Delhi NCR and Pan-India.