Accelerated polyurethane sealant for floor joints and civil engineering applications Sikaflex-423 PowerCure is a 1-part, accelerated, elastic polyurethane sealant. It seals many kinds of joint configurations in floors and civil engineering structures. The elasticity is maintained over a wide temperature range and high mechanical and chemical resistance provides good durability. - High movement capability: ±25 % (ISO 9047).
- Fast development of mechanical properties.
- Very good mechanical resistance.
- Very good resistance to specific chemicals.
- High resistance to weathering.
- Good durability.
- Non-staining to a wide range of substrates.
- Monomeric diisocyanate content <0.1 %: no user safety training needed (REACH restriction 2023, Annex XVII entry 74).
- Bubble-free curing.
- Good adhesion to many construction materials.
- Durable anti-pick formulation for joints subject to idle tampering and acts of vandalism where traditional sealants may be more easily damaged or removed.
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Usage The Product is used for the following horizontal and vertical interior and exterior joint sealing applications: - Warehouse and production floor areas.
- Sewage treatment plants.
- Tunnels.
- Car park decks.
- Pedestrian and traffic areas.
- Sea walls.
- Secure environments where a tamper-resistant sealant may be required e.g. prisons & secure units (supervised & hard-to-reach areas).
Advantages - High movement capability: ±25 % (ISO 9047).
- Fast development of mechanical properties.
- Very good mechanical resistance.
- Very good resistance to specific chemicals.
- High resistance to weathering.
- Good durability.
- Non-staining to a wide range of substrates.
- Monomeric diisocyanate content <0.1 %: no user safety training needed (REACH restriction 2023, Annex XVII entry 74).
- Bubble-free curing.
- Good adhesion to many construction materials.
- Durable anti-pick formulation for joints subject to idle tampering and acts of vandalism where traditional sealants may be more easily damaged or removed.
Packaging 600 ml Powercure Pack with booster | 14 foil packs with booster per box |
Refer to the current price list for available packaging variations. Colour Colour range to be defined by local sales organisation |
Technical Information Shore A Hardness FINAL SHORE A HARDNESS ~40 (after 28 days) 80 % DEVELOPMENT OF SHORE A HARDNESS 80 % of final hardness | Time | +5 °C | 6 days | +10 °C | 5 days | +23 °C | 2 days | +40 °C | 1 day |
DEVELOPMENT OF SHORE A HARDNESS Testing conditions +23 °C / 50 % rH. Time | +5 °C | +23 °C | +35 °C | 2 hours | <5 | ~7 | ~16 | 4 hours | ~5 | ~15 | ~23 | 8 hours | ~10 | ~21 | ~26 | 24 hours | ~26 | ~28 | ~32 | 7 days | ~32 | ~31 | ~37 |
Secant Tensile Modulus ~0.65 N/mm2 at 100 % elongation (+23 °C) ~1.00 N/mm2 at 100 % elongation (−20 °C) | (ISO 8339) |
Tear Propagation Resistance
Service Temperature | Maximum | +80 °C | | Minimum | -40 °C |
Chemical Resistance Resistant to many chemicals. Refer to EN 15651-4 SKZ test report for water and salt water. Contact Sika Technical Services for additional information.
Joint Design The joint dimensions must be designed to suit the movement capability of the sealant. The joint width must be a minimum of 10 mm and a maximum of 40 mm. All joints must be correctly designed and dimensioned in accordance with the relevant standards and codes of practice before their construction. The basis for calculation of the necessary joint widths are: A width to depth ratio of 1:0.8 for floor joints must be maintained (for exceptions, see table below). For larger joints, contact Sika Technical Services for additional information. Example for typical joint widths for joints between concrete elements for interior applications considering 25 % movement capability according to EN 15651-4: Joint distance | Minimum joint width | Minimum joint depth | 2 m | 10 mm | 10 mm | 4 m | 10 mm | 10 mm | 6 m | 10 mm | 10 mm | 8 m | 15 mm | 12 mm | 10 m | 18 mm | 15 mm |
Example for typical joint widths for joints between concrete elements for exterior applications considering 25 % movement capability according to EN 15651-4: Joint distance | Minimum joint width | Minimum joint depth | 2 m | 10 mm | 10 mm | 4 m | 15 mm | 12 mm | 6 m | 20 mm | 17 mm | 8 m | 28 mm | 22 mm | 10 m | 35 mm | 28 mm |
For details of joint design and calculations refer to the following document, Sika Design guidlines: Dimensioning of construction joints.
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Application Information Sag Flow 0 mm (20 mm profile, +50 °C) | (EN ISO 7390) |
Product Temperature Maximum | +40 °C | Minimum | +5 °C |
Ambient Air Temperature For applications at temperatures below +5 °C, please contact Sika Techincal Services. Substrate Temperature The substrate temperature must be +3 °C above dew point temperature and free from frost and ice. Backing Material Use closed cell, polyethylene foam backing rod Tooling Time ~15 minutes (+23 °C / 50 % r.h.) |
The above design is only a sample of the options available, for reference purposes only. Our policy of continuous improvement may result in a change of specifications without notice. If any discrepencies might be between the data sheet values and standards, we reserve the rights to make technical changes. Our company will not be held responsible, as all or any of pictures, drawings, weights and dimensions details or other elements in this document are only indicative and must not be considered contractual. Contact our sales team for other specifications or custom made products.
Contact our sales team for other specifications or custom made products.
