Sikaflex® Construction
Sealant for building joints
Sikaflex® Construction is a one-component, moisture-curing, elastic joint sealant.
- One component, ready to use
- Fast-curing
- Non-sag
- Bubble-free curing
- Can be overpainted
- High tear resistance
- Very good adhesion to many substrates
- Good weather and ageing resistance
- Excellent workability, easy to smoothen
Usage
Sikaflex® Construction is designed for movement and connection joints on porous substrates as well as indoor and outdoor sealing applications.Advantages
- One component, ready to use
- Fast-curing
- Non-sag
- Bubble-free curing
- Can be overpainted
- High tear resistance
- Very good adhesion to many substrates
- Good weather and ageing resistance
- Excellent workability, easy to smoothen
Packaging
600ml sausages, 20 sausages per box
Colour
White, Concrete Grey (other colors available upon request)
Product Details
APPROVALS / STANDARDS
- Conforms to ISO 11600 Classification F 25 HM /20 LM
- Conforms to ASTM C 920 Type S, Grade NS, Class 25, Use NT, G, M and A
Chemical Base
1-component polyurethane, moisture curing
Shelf Life
12 months from date of production if stored in undamaged, original, sealed packaging and if storage conditions are met.
Storage Conditions
Store in dry conditions, protected from direct sunlight and at tempera-tures between +5 °C and +25 °C.
Density
1.30 kg/l approx. 2) | (CQP 1) 006-4, ISO 1183-1) |
Shore A Hardness
35 after 28 days approx. 2) | (CQP 023-1, ISO 868) |
Secant Tensile Modulus
0.45 N/mm2 approx. at 100% elongation (23 °C) | (ISO 8339) |
| 0.75 N/mm2 approx. at 100% elongation (−20 °C) |
Elastic Recovery
> 80% 2) after 28 days | (ISO 7389) |
Tear Strength
1.2 N/mm2 approx. 2) (CQP 036-1, ISO 37)
Tear Propagation Resistance
7.0 N/mm approx. 2) | (CQP 045-1, ISO 34) |
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 ≤ 40 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
Joint distance [m] | Min joint width [mm] | Min. joint depth [mm] |
2 | 10 | 10 |
| 4 | 15 | 10 |
| 6 | 20 | 10 |
8 | 30 | 15 |
10 | 35 | 17 |
All joints must be correctly designed and dimensioned in accordance with the relevant standards, before their construction. The basis for calculation of the necessary joint widths are the type of structure and its dimensions, the technical values of the adjacent building materials and the joint sealing material, as well as the specific exposure of the building and the joints.
For larger joints please contact our Technical Service Department.
Application
Backing Material
Use closed cell, polyethylene foam backing rods.
Sag Flow
0 mm | (CQP 061-4, ISO 7390) |
Ambient Air Temperature
+5 °C to +40 °C, min. 3 °C above dew point temperature
Substrate Temperature
+5 °C to +40 °C
Curing Rate
3 mm/24 h approx. 2) | (CQP 049-2) |
Skin Time
60 minutes approx. 2) | (CQP 019-1) |
Tooling Time
80 minutes approx. (23 °C / 50% r.h.) | (CQP 019-2) |
Consumption
| Joint length [m] per 600 ml foil pack | Joint width [mm] | Joint depth [mm] |
6 | 10 | 10 |
4 | 15 | 10 |
3 | 20 | 10 |
| 2 | 25 | 12 |
| 1.3 | 30 | 15 |
SUBSTRATE PREPARATION
Substrate must be clean, dry, homogeneous, and free from oil, grease, dust and loose or friable particle. Cement laitance must be removed
Non-porous substrates
e.g. metal, powder coating etc. have to be cleaned with a fine abrasive pad and Sika® Aktivator-100 by using a clean towel / cloth.
After a flash off time of at least 15 min, apply Sika® Primer-3 N 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 cement based renders, mortars and bricks shall be primed using Sika® Primer-3 N applied with a brush. Before sealing, allow a flash-off time of > 30 minutes (< 8 hours).
Important Note: Primers are only adhesion promoter. 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 immediately after use with Sika® Remover-208 and/or Sika® TopClean T or equivalent. Hardened / cured marterials can only be mechanically removed.
