Sikaflex® Construction
Sikaflex® Construction is a 1-component, moisture-curing, elastic joint sealant based on polyurethane. It is suitable for outdoor applications.
- Movement capability of ± 25
- Excellent workability, easy to smooth
- Very good adhesion to many substrates
- Non sag
- One component, ready to use
- Weather resistance, excellent aging resistance
- High tear resistance
- Bubble free curing and can be overpainted
Usage
Sikaflex® Construction is designed for movement and connection joints on porous substrates as well as in- door and outdoor general sealing applications.Advantages
- Movement capability of ± 25
- Excellent workability, easy to smooth
- Very good adhesion to many substrates
- Non sag
- One component, ready to use
- Weather resistance, excellent aging resistance
- High tear resistance
- Bubble free curing and can be overpainted
Packaging
600 ml sausages, 20 sausages per box.
Colour
White, concrete grey, black, beige
Product Details
APPROVALS / STANDARDS
ISO 11600 (Type F Class 25HM / 20LM)
Chemical base
1-part polyurethane, moisture curing
Shelf life
12 months from date of production if stored in undamaged original sealed containers.
Storage conditions
Sikaflex® Construction shall be stored in dry conditions, where it is protected from direct sunlight and at temperatures between +5 °C and +25 °C.
Density
1.30 kg/l approx.
Shore A Hardness
| 35 after 28 days approx. | (DIN 53505) |
Tensile Strength
| 1.2 N/mm² approx. | (ISO 37) |
Secant Tensile Modulus
| 0.6 N/mm² aprox. at 100% elongation after 28 days | (ISO 8340) |
Elastic Recovery
| ≥ 85% | (DIN EN ISO 7389 B) |
Movement Capability
| ± 25% | (ISO 9047) |
Service temperature
−40 °C to +70 °C
Joint Design
The joint width must be designed to suit the joint movement required and the movement capability of the sealant. The joint width shall be ≥ 10 mm and ≤ 35 mm. A width to depth ratio of 2:1 must be maintained (for exceptions, see table below).
Standard joint widths for joints between concrete elements as per DIN 18540 / Table 3:
| Joint distance (m) | Design joint width (mm) | Min. joint width (mm) | Joint depth (mm) |
| 2 | 15 | 10 | 8 |
| 2 - 3.5 | 20 | 15 | 10 |
| 3.5 - 5 | 25 | 20 | 12 |
| 5 - 6.5 | 30 | 25 | 15 |
| 6.5 - 8 | 35 | 30 | 15 |
Minimum joint width for perimeter joints around windows: 10 mm
All joints must be properly designed and dimensioned by the specifier and the main contractor in accordance with the relevant standards, because changes are not usually feasible after construction. The basis for calculation of the necessary joint width are the technical values of the joint sealant and the adjacent building materials, plus the exposure of the building, its method of construction and its dimensions.
Approximate consumption
| Joint width (mm) | Joint depth (mm) | Joint length (m)/600 ml |
| 10 | 8 | 7.5 |
| 15 | 8 | 4.5 |
| 20 | 10 | 2.5 |
| 25 | 12 | 1.6 |
| 30 | 15 | 1.3 |
Backing: Use only closed cell, polyethylene foam backing rods.
Application
Backing Material
Use only closed cell, polyethylene foam backing rods.
Sag Flow
| 0 mm (very good) | (DIN EN ISO 7390) |
Ambient Air Temperature
+5 °C to +40 °C, min. 3 °C above dew point temperature
Substrate Temperature
+5 °C to +40 °C
Substrate Moisture Content
Dry
Curing Rate
| 3 mm / 24 hours approx. |
Skin time
| 60 minutes approx. (23 °C / 50% r.h.) |
Consumption
Approximate consumption
| Joint width [mm] | Joint depth [mm] | Joint length / 600 ml [m] |
| 10 | 8 | ~ 7.5 |
| 15 | 8 | ~ 4.5 |
| 20 | 10 | ~ 2.5 |
| 25 | 12 | ~ 1.6 |
| 30 | 15 | ~ 1.3 |
SUBSTRATE PREPARATION
Clean and dry, homogeneous, free from oils and grease, dust and loose or friable particles. Cement laitance must be removed.
Non porous substrates: E.g. metals, powder coatings, etc. have to be cleaned with a fine abrasive pad and Sika® Aktivator-205 by using a clean towel / cloth. After a flash off time of at least 15 min, apply Sika® Primer-3N by using a brush. Before sealing allow a flash off time of at least 30 min. (max. 8 hrs.). For PVC use Sika® Primer-215. Before sealing allow a flash off time of at least 30 min. (max. 8 hrs.).
Porous substrates: E.g concrete, aerated concrete and cementitious renders, mortars, brick, etc. have to be primed with Sika® Primer-3N by using a brush. Before sealing allow a flash off time of at least 30 min. (max. 8 hrs.).
Important note: Primers are only adhesion promoters. They neither substitute for the correct cleaning of the surface nor improve their strength significantly.
Primers improve long term performance of a sealed joint.
For further information refer to the Sika® Primer Table.
CLEANING OF TOOLS
Clean all tools and application equipment with Sika® Remover-208 / Sika® TopClean T immediately after use. Hardened / cured material can only be mechanically removed.