Sikaflex® Construction

• 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

1-component polyurethane, moisture curing

12 months from date of production if stored in undamaged, original, sealed packaging and if storage conditions are met.

Store in dry conditions, protected from direct sunlight and at tempera-tures between +5 °C and +25 °C.

1.2 N/mm2 approx. ²⁾                                                              (CQP 036-1, ISO 37)

−40 °C to +70 °C

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

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.

Use closed cell, polyethylene foam backing rods.

+5 °C to +40 °C, min. 3 °C above dew point temperature

+5 °C to +40 °C

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.
 

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.