- Current Name: Sika Ucrete SLB
- Former Name: Sikafloor PurCem SLB (system role per the March 2021 system sheet, built on Sikafloor-24 NA PurCem)
- System Type: Self-leveling, water-dispersed polyurethane cement broadcast system
- Base Product: Sika Ucrete HS24 NA slurry
- Broadcast: Sikafloor-508 aggregate into the wet slurry
- Thickness: 80 to 160 mils (2 to 4 mm); 80-mil documented minimum
- Finish: Textured broadcast profile under a pigmented seal coat
- Topcoat: Sika Ucrete TC31 NA at 15 to 20 mils (formerly Ucrete DP TC); Sikafloor-521 with Sikafloor Urethane Pigment Pack as the documented alternate
- Optional Primer: Sikafloor-2570 WB at 3 to 5 mils
- Service Temperature: -40°F to 248°F
- Compressive Strength: 6,961 psi at 28 days (ASTM C579)
- Flexural Strength: 2,726 psi (ASTM C580)
- Tensile Strength: 1,290 psi (ASTM C307)
- Shore D Hardness: 83 (ASTM D2240)
- Substrate: Profile equivalent to ICRI CSP 3-6 per the system sheet; accepts concrete at 7 to 10 days and moisture above 4% by mass
Phone: +1 (844) 687-1961
Sika Ucrete SLB is a self-leveling urethane cement broadcast system built on Sika Ucrete HS24 NA at 80 to 160 mils (2 to 4 mm), textured with a Sikafloor-508 aggregate broadcast and sealed under a Sika Ucrete TC31 NA topcoat. The name is newer than the system. Sika published the Ucrete SLB System Data Sheet in November 2025, and the same build ran for years as Sikafloor PurCem SLB, whose March 2021 system sheet lists the identical role on Sikafloor-24 NA PurCem. Specifiers reach for Ucrete SLB where a smooth self-leveler would be a slip liability, because the aggregate broadcast carries a wet-area traction profile that a smooth finish cannot. Craftsman Concrete Floors installs Sika Ucrete SLB nationwide as a Sika Certified Installer.
The data sheet puts service temperature at -40°F to 248°F, compressive strength at 6,961 psi per ASTM C579, and Shore D hardness at 83 per ASTM D2240, which places the system in medium-duty processing, warehouse, and commercial service rather than the heavy thermal duty Ucrete UD 200 covers. Substrate tolerance is the quiet differentiator. The sheet accepts concrete at seven to ten days old and moisture above 4 percent by mass, conditions that stop most resinous systems at the moisture test. This page covers the documented build, the substrate window, the PurCem paper trail, and the system’s position in the Sika line.
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Sika Ucrete SLB System Build and Line Position
Two Sika documents govern this page. Current values come from the Ucrete SLB System Data Sheet, November 2025, Version 01.01; the legacy trail runs through the Sikafloor PurCem SLB system sheet of March 2021. Kit coverages, mix ratios, and cure schedules live on those documents and their component product data sheets rather than here. What follows is the installer’s read of that paperwork, not a retyping of it.
HS24 NA Slurry, Sikafloor-508 Broadcast, Ucrete TC31 NA Seal
The sheet documents a three-layer build. Sika Ucrete HS24 NA, a water-dispersed polyurethane cement, goes down as a self-leveling slurry at 80 to 160 mils. Sikafloor-508 aggregate is broadcast into the wet slurry to set the texture, and Sika Ucrete TC31 NA, the pigmented topcoat formerly published as Ucrete DP TC, locks the profile at 15 to 20 mils; the sheet lists Sikafloor-521 with Sikafloor Urethane Pigment Pack as the alternate seal and Sikafloor-2570 WB as an optional primer at 3 to 5 mils. Smooth-finish Ucrete SL runs the same HS24 NA slurry without the broadcast, so the wearing surface, not the chemistry, is the choice between the two.
Ucrete SLB and Ucrete SLB Plus Split at the Base Product
Ucrete SLB runs on Ucrete HS24 NA; Ucrete SLB Plus runs on Ucrete HS22 NA, the heavy-duty solid-color urethane slurry, at 3/16 to 1/4 inch. That base-product split, documented across the two system sheets and the Sika Ucrete systems brochure, is the specification difference. Plus is not a thicker pour of the same material. A spec that reads Ucrete SLB Plus or names the 22 NA slurry belongs on that system’s page, heavier trowel-applied duty belongs to Ucrete UD 200, and the full lineup is mapped on the Sika manufacturer page. Sherwin-Williams Poly-Crete SLB, despite the letters, is a different manufacturer’s system with its own data sheet.
Green Concrete at Seven to Ten Days Is Inside the Application Window
Most resinous systems wait 28 days for concrete cure. The Ucrete SLB sheet accepts substrate at seven to ten days old. Moisture above 4 percent by mass and relative humidity readings below 100 percent per ASTM F2170 sit inside the documented window as well, which is why the system gets specified on fast-track schedules where a moisture reading would park an epoxy for weeks. Tolerance on paper does not replace verification: Craftsman runs pre-install moisture and substrate testing on every pour, preps to the profile this system’s sheet calls out, equivalent to ICRI CSP 3-6, and checks substrate compressive strength against the sheet’s 3,625 psi minimum. When the HS24 NA slurry serves as the base coat of a moisture-vapor-transmission system, the sheet’s minimum is 125 mils before any aggregate broadcast.
A November 2025 Name on a March 2021 Document Trail
Sika Ucrete SLB entered the US system library in November 2025. The build it describes is older. The Sikafloor PurCem SLB system sheet, published March 2021 at Version 01.05, defines the identical role on Sikafloor-24 NA PurCem slurry at 80 to 160 mils with the same Sikafloor-508 aggregate, and Sikafloor-31 NA PurCem sealing the surface where Ucrete TC31 NA now sits. Sika has been republishing the US PurCem catalog under the Ucrete brand since the May 2, 2023 MBCC acquisition brought the Ucrete name to Sika. A spec that still reads Sikafloor PurCem SLB prices as the system on this page; the family-wide mapping lives on the Sikafloor PurCem page, and spec-substitution questions on either wording go through the urethane cement contractor page.
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Frequently Asked Questions
Sika Ucrete SLB is a self-leveling urethane cement broadcast system engineered with Sika Ucrete HS24 NA at 80 to 160 mils (2 to 4 mm), textured with a Sikafloor-508 aggregate broadcast and sealed with a Sika Ucrete TC31 NA topcoat. Sika published the current System Data Sheet in November 2025 as Version 01.01.
The documented band is 80 to 160 mils (2 to 4 mm), with 80 mils as the sheet’s minimum thickness. The Ucrete TC31 NA topcoat adds 15 to 20 mils over the broadcast, and a 125-mil slurry minimum, taken before the aggregate broadcast, applies when Ucrete SLB serves as the base coat of a moisture-vapor-transmission system.
Base product separates them. Ucrete SLB is built on Ucrete HS24 NA at 80 to 160 mils and takes an aggregate broadcast; Ucrete SLB Plus is built on Ucrete HS22 NA, Sika’s heavy-duty solid-color urethane slurry, at 3/16 to 1/4 inch. Heavier thermal and point-load duty moves the specification toward the Plus system or Ucrete UD 200.
No. Sika Ucrete SLB is built on Ucrete HS24 NA and documented in Sika’s system library; Poly-Crete SLB is a Sherwin-Williams High Performance Flooring system with its own data sheet and a FasTop legacy line. The shared letters are coincidence, and a spec naming one is not satisfied by installing the other.
Sikafloor PurCem SLB. The March 2021 system sheet, Version 01.05, defines the identical role on Sikafloor-24 NA PurCem slurry at 80 to 160 mils with the same Sikafloor-508 aggregate broadcast. Sika republished the system under the Ucrete name in November 2025, after the May 2, 2023 MBCC acquisition brought the Ucrete brand to Sika.
Yes, within documented limits. The system sheet accepts concrete at seven to ten days old, moisture above 4 percent by mass, and relative humidity readings below 100 percent measured per ASTM F2170. Craftsman still records a moisture and substrate baseline before every install, because tolerance on the data sheet is not a substitute for documentation at closeout.
Sika Ucrete TC31 NA, the pigmented topcoat formerly published as Ucrete DP TC, seals the broadcast at 15 to 20 mils. The sheet also lists Sikafloor-521 with Sikafloor Urethane Pigment Pack as an alternate seal coat and Sikafloor-2570 WB as an optional primer at 3 to 5 mils.
The current sheet is the November 2025, Version 01.01 release, hosted in the system-sheets library on usa.sika.com and linked in the datasheet section above. Pot life, cure, and recoat detail lives on the component product data sheets for Ucrete HS24 NA and Ucrete TC31 NA, which the system sheet defers to.
Craftsman Concrete Floors installs Sika Ucrete SLB as a Sika Certified Installer, with in-house W-2 crews that mobilize nationwide. A spec written as Ucrete SLB and a spec still reading Sikafloor PurCem SLB price as the same system.
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