Sikaflex® Precast

• Conformity with LEED v2009 IEQc 4.1: Low-Emitting Materials - Adhesives and Sealants

• CE Marking and Declaration of Performance to EN 15651-1 - Sealants for non-structural use in joints in buildings - Facade elements - F-EXT-INT CC
• EN ISO 11600-F Class 25HM, Sikaflex® Precast, SKZ, Test report No. 113665/14-III
• ASTM C920-11 Class 25, Sikaflex Precast, MST, Report No. 1213920-SIKA

Polyurethane

12 months from date of production

The product must be stored in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +5 °C and +25 °C. Always refer to packaging.

EN 15651-1: F EXT-INT CC

ISO 1600: F 12.5 E

ASTM C920-11: Class 25

−40 °C to +70 °C

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 30 mm.

A width to depth ratio of 2:1 must be maintained (for exceptions, see table below).

Typical joint dimensions for joints between concrete elements:

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 the type of structure, dimensions, technical values of the adjacent building materials, joint sealing material and the specific exposure of the building and the joints.

For larger joints, contact Sika® Technical Services for additional information.

Use closed cell, polyethylene foam backing rod

+5 °C min./+50 °C max.

+5 °C min./+50 °C max. Minimum +3 °C above dew point temperature

* Sika Corporate Quality Procedure

Consumption depends on the roughness and absorbency of the substrate.

These figures are theoretical and do not allow for any additional material due to surface porosity, surface profile, variations in level or wastage etc.

The substrate must be clean, dry, sound and free from oils, grease, dust, cement laitance and loose or friable particles.

Removal techniques such as wire brushing, grinding, grit blasting or other suitable mechanical tools can be used.

Sikaflex® Precast adheres without primers and/or activators.

For optimum adhesion, joint durability and critical, high performance applications such as joints on multi-storey buildings, highly stressed joints, extreme weather exposure or water immersion / exposure. The following priming and/or pre-treatment procedures must be followed:

Porous substrates

Concrete, aerated concrete and cement based renders, mortars and bricks surfaces must be primed using Sika® Primer-3 N applied by brush.

Before sealing, allow a waiting time of > 30 minutes (< 8 hours).

Note: Primers and activators are adhesion promoters and not an alternative to improve poor preparation / cleaning of the joint surface. Primers also improve the long term adhesion performance of the sealed joint.

Contact Sika® Technical Services for additional information.

1-part ready to use

Clean all tools and application equipment with Sika® Remover-208 immediately after use. Hardened material can only be removed mechanically. For cleaning skin, use Sika® Cleaning Wipes-100.