Sika® Ucrete® BC 4
(formerly Ucrete® BC 4)
Heavy-duty, flow-applied basecoat for 3/16" Sika® Ucrete® flooring systems
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Sika® Ucrete® BC 4 is a fast-curing, flow-applied mortar. It provides a broadcasted base coat for 3/16" Sika® Ucrete® flooring systems.
- Expert installation by fully trained and licensed applicators
- Suitable for application on to 7-day-old concrete and 3-day-old polymer screed
- Can be accelerated with Sika® Ucrete® Accelerator for fast installation within a 12-hour window
- Non-tainting from the end of mixing
Usage
Sika® Ucrete® BC 4 is used as a:- Basecoat under Sika® Ucrete® DP, Sika® Ucrete® CS and Sika® Ucrete® HPQ flooring systems
- Scratch coat under all Sika® Ucrete® flooring systems
- The Product may only be used by experienced professionals.
Advantages
- Expert installation by fully trained and licensed applicators
- Suitable for application on to 7-day-old concrete and 3-day-old polymer screed
- Can be accelerated with Sika® Ucrete® Accelerator for fast installation within a 12-hour window
- Non-tainting from the end of mixing
Packaging
Refer to the current price list for available packaging variations.
Product Details
APPROVALS / STANDARDS
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Halal Certification Europe (HCE), Sika® Ucrete®, WHFC, Certificate No. 21453-2/1/1/Y1
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Food and Beverage Facilities Suitability, Sika® Ucrete®, HACCP, Test Report No. I-PE-769-SA-2-RG-06b
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Indoor Air Comfort Gold EN 16516, Sika® Ucrete®, eurofins, Certificate No. IACG-321-01-01-2023
Chemical Base
Water-based polyurethane cement hybrid
Shelf Life
Always refer to the best-before date of the individual packaging.
Storage Conditions
The Product must be stored in original, unopened and undamaged sealed packaging in dry conditions at temperatures between 41 °F and 86 °F. Always refer to the packaging.
Refer to the current Safety Data Sheet for information on safe handling and storage.
Tensile Adhesion Strength
> 2.0 N/mm² (concrete failure) | (EN 1542) |
Chemical Resistance
Laboratory-defined resistance to many individual chemicals. Before proceeding, contact Sika Technical Service for specific information.
Application
Layer Thickness
3/16"
Product Temperature
| Maximum | 77 °F |
| Minimum | 59 °F |
Ambient Air Temperature
| Maximum | 86 °F |
| Minimum | 53 °F |
Dew Point
Beware of condensation. The substrate and uncured applied product must be at least 37 °F above the dew point to reduce the risk of condensation or blooming on the surface of the applied product. Low temperatures and high humidity conditions increase the probability of blooming.
Substrate Temperature
| Maximum | 86 °F |
| Minimum | 53 °F |
Waiting / Recoat Times
| Substrate temperature | Waiting time |
| 46 °F | 16–24 hours |
| 50 °F | 4 hours (with Sika® Ucrete® Accelerator) |
Note: Times are approximate and will be affected by changing ambient and substrate conditions.
Coverage
1.2-1.6 lb/ft²
SUBSTRATE PREPARATION
IMPORTANT
Reduced service life due to incorrect treatment of cracks
The incorrect assessment and treatment of cracks may lead to a reduced service life and reflective cracking.
- For static cracks, ensure the width is suitable for overcoating with Sika® Ucrete® BC 4.
- For dynamic cracks, ensure the movement is within the movement capacity of Sika® Ucrete® BC 4.
TREATMENT OF JOINTS AND CRACKS
Construction joints and existing static surface cracks in substrate require pre-treating before full layer application. Use Sikadur® or Sikafloor® resins.
The Product can be applied on green or damp concrete with no standing water. Allow for at least 3 days for early concrete shrinkage to occur to prevent shrinkage cracks from appearing on the wearing surface.
Cementitious substrates must be structurally sound and of sufficient compressive strength (minimum 30 N/mm2) with a minimum tensile strength of 1.5 N/mm2.
Substrates must be clean, dry and free of contaminants such as dirt, oil, grease, coatings, laitance, surface treatments and loose friable material.
APPLICATION
Application must be undertaken by a fully trained Sika® Ucrete® applicator.