- Current Name: Sika Ucrete SL
- Former Names: None — current Sika system naming; no legacy code maps to this system
- System Type: Self-leveling polyurethane cementitious slurry engineered with Sika Ucrete HS24 NA
- Thickness: 80-160 mils (2-4 mm); 80-mil minimum; 125-mil minimum as an MVT base coat
- Finish: Smooth, easy-to-clean self-leveling surface with slip resistance
- Service Temperature: -40°F to 248°F (-40°C to 120°C)
- System Build: Sika Ucrete TC31 NA primer, 15-20 mils; Sika Ucrete HS24 NA slurry, 80-160 mils; optional Sika Ucrete TC31 NA topcoat
- Topcoat/Accessories: Sika Ucrete TC31 NA (formerly Ucrete DP TC)
- Compressive Strength: 6,961 psi at 28 days (ASTM C579)
- Flexural Strength: 2,726 psi (ASTM C580)
- Tensile Strength: 1,290 psi (ASTM C307)
- Hardness: Shore D 83 (ASTM D2240)
- Water Absorption: 0.10% (ASTM C413)
- Abrasion Resistance: 0.07 g loss CS-17 wheel; 0.24 g loss H-22 wheel, 1,000 cycles (ASTM D4060)
- Microbial Test Data: Fungi growth rated 0, no growth (ASTM G21); mold growth rated 10, highest resistance (ASTM D3273)
- Substrate: 3,625 psi compressive minimum; 218 psi tensile; ICRI CSP 3-6; green concrete at 7-10 days typical
- Source: Sika Ucrete SL System Data Sheet, November 2025, Version 01.01
Phone: +1 (844) 687-1961
Sika Ucrete SL is a self-leveling polyurethane cementitious slurry engineered with Sika Ucrete HS24 NA, installed at 80 to 160 mils (2 to 4 mm). The current system data sheet, November 2025, Version 01.01, defines the build: Sika Ucrete TC31 NA primer at 15 to 20 mils, the HS24 NA slurry body, and an optional TC31 NA topcoat. Ucrete SL is current Sika system naming. No legacy product code maps to it, so a spec that reads Sika Ucrete SL calls for exactly what installs today. The system holds its physical characteristics from -40°F to 248°F (-40°C to 120°C), is steam cleanable at full thickness, and meets the requirements of USDA for use in food plants.
The manufacturer’s uses list places the system in areas of medium to heavy loading and abrasion, naming warehouses, production facilities, laboratories, and workshops, with food plants covered by the sheet’s USDA statement. Vertical depth stays on the owning pages, from food processing to cold storage, and line-level system selection belongs to the Sika brand page; this page carries the SL system’s own numbers. Craftsman Concrete Floors installs Sika Ucrete SL as a Sika Certified Installer. In-house W-2 crews mobilize nationwide. Every install opens with documented moisture and substrate verification against the limits below.
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Sika Ucrete SL System Profile
Every value in this section comes from the Sika Ucrete SL System Data Sheet, November 2025, Version 01.01, or the Ucrete HS24 NA product documentation it points to. Ucrete SL is a system name. HS24 NA is the slurry it is engineered with. Specs sometimes carry one and submittals the other, and both resolve to the same installed floor. Where a value below is a component-product number rather than a system-sheet number, the text says so.
Build-Up — TC31 NA Primer, HS24 NA Slurry, Optional Topcoat
The build is three layers at most. Sika Ucrete TC31 NA, the topcoat product formerly named Ucrete DP TC, primes at 15 to 20 mils; the Sika Ucrete HS24 NA slurry places at 80 to 160 mils; a TC31 NA topcoat is optional. HS24 NA is a phthalate-free, water-dispersed polyurethane-cement screed, and Sika describes the finished surface as easy to clean and smooth, with slip resistance. Selection across the wider Ucrete line, from SL+ up through the heavy-duty systems, is covered on the Sika brand page rather than here.
Temperature, Chemistry, and Impact Behavior
From -40°F to 248°F (-40°C to 120°C), the system retains its physical characteristics, and steam cleaning is rated at the full 80 to 160 mil thickness. The reason it survives thermal cycling is coefficient matching. At 3.02 x 10^-5 in/in/°F (ASTM D696), Ucrete SL expands and contracts nearly with the concrete beneath it, so wash cycles load the floor and slab together instead of shearing the bond line. The sheet’s chemistry line covers organic and inorganic acids, alkalis, amines, salts, and solvents. Under impact the material behaves plastically, deforming rather than cracking or debonding.
Mechanical Values from the November 2025 System Sheet
The system sheet reports 6,961 psi compressive strength at 28 days (ASTM C579), 2,726 psi flexural (ASTM C580), 1,290 psi tensile (ASTM C307), and Shore D 83 hardness (ASTM D2240). Water absorption measures 0.10% (ASTM C413). Abrasion loss runs 0.07 g on the CS-17 wheel and 0.24 g on the H-22 wheel at 1,000 cycles (ASTM D4060), which the sheet attributes to the aggregate structure. Microbial-resistance testing rates fungi growth 0, no growth (ASTM G21), and mold growth 10, the highest resistance rating (ASTM D3273). The sheet also lists the system as non-tainting and odorless.
Substrate, Moisture, and Green-Concrete Limits
Substrate requirements are concrete at 3,625 psi compressive minimum, 218 psi tensile pull-off, and an ICRI CSP 3-6 profile. Moisture tolerance is the working advantage. The sheet permits placement on green concrete at typically 7 to 10 days, over substrates reading above 4% surface moisture by mass on a Tramex CME meter, and below 100% relative humidity per ASTM F2170. Used as the base coat of a moisture vapor transmission system, Ucrete SL carries a 125-mil minimum. Craftsman documents the pre-install readings, RH probes per ASTM F2170 and surface-moisture checks, in the closeout package on every project.
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Frequently Asked Questions
Sika Ucrete SL is a self-leveling polyurethane cement slurry for areas of medium to heavy loading and abrasion, and Sika’s uses list names warehouses, production facilities, laboratories, and workshops. The same sheet states it meets the requirements of USDA for use in food plants, which brings washdown food and beverage rooms into range at the 80 to 160 mil build.
Nominal build is 80 to 160 mils (2 to 4 mm). When Ucrete SL serves as the base coat of a moisture vapor transmission system, the November 2025 system sheet raises the minimum to 125 mils.
Ucrete SL is engineered with Sika Ucrete HS24 NA; Ucrete SL+ is engineered with Sika Ucrete HS22 NA. Both fill the self-leveling role in the line, and each system’s sheet carries its own values, so the working answer is to match the spec’s system name and pull that sheet. The Ucrete SL+ page on this site carries that system’s numbers.
Yes, within stated limits. The system sheet allows placement on green concrete at typically 7 to 10 days, over substrates reading above 4% surface moisture by mass on a Tramex CME meter, and below 100% relative humidity per ASTM F2170. The substrate itself still needs 3,625 psi compressive strength, 218 psi tensile pull-off, and an ICRI CSP 3-6 profile.
Steam cleaning is rated at the full 80 to 160 mil thickness, and the system holds its physical characteristics from -40°F to 248°F. Thermal expansion is the mechanism. At 3.02 x 10^-5 in/in/°F (ASTM D696), the mortar moves nearly with the slab, so heat cycles load the floor and substrate together instead of shearing the bond line.
Nothing. Ucrete SL is current Sika system naming, and no legacy product code maps to it. Specs holding older Sikafloor PurCem names route per code to other current Ucrete products, and the Sikafloor PurCem page carries those mappings.
At 68°F, Sika’s published cure data for Ucrete HS24 NA, the slurry this system is built on, runs about 18 hours to foot traffic, 24 hours to light traffic, and full cure near 5 days. Cold slabs stretch every window, with foot traffic at roughly 24 hours at 50°F, so return-to-service planning follows substrate temperature rather than the calendar.
Craftsman Concrete Floors installs Sika Ucrete SL as a Sika Certified Installer, and the system sheet itself limits use to experienced professionals. In-house W-2 crews mobilize nationwide. The urethane cement contractor page covers how to evaluate any installer, from certification through closeout documentation and warranty structure.
The full system data sheet, November 2025, Version 01.01, is linked on this page and hosted by Sika. Pot-life and cure detail for the component products sits in their individual product data sheets, which the system sheet defers to.
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