Product Data Sheet Safety Data Sheet Show all documents
Sika®-4a

Sika®-4a

Rapid setting cement additive to stop leaks

Sika®-4a is a rapid setting water stopping cement additive. When mixed with ordinary Portland cement and water, it sets rapidly to seal areas of moderate water infiltration through concrete, rock or masonry.

The benefits of Sika®-4a include, but are not limited to the following:
  • Rapid setting for rapid leak plugging and/or fixing.
  • Ready to use, just add clean water and Ordinary Portland Cement.
  • Does not contain chlorides.
  • Solvent free.
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Product Data Sheet Safety Data Sheet Show all documents

Usage

Sika®-4a is used as preliminary waterproofing work on wet surfaces or where there is general infiltration of water, prior to the application of subsequent cementitious render or gunite. Typical applications are tunnels and culverts, mine galleries, water reservoirs, concrete pipes and manholes. It can also be used in quick setting mortar for assembly work, e.g. for fixing anchors, bolts and other fitting subject to early loading in rock or concrete.  

Advantages

The benefits of Sika®-4a include, but are not limited to the following:
  • Rapid setting for rapid leak plugging and/or fixing.
  • Ready to use, just add clean water and Ordinary Portland Cement.
  • Does not contain chlorides.
  • Solvent free.

Packaging

5 L

Colour

Clear liquid

Product Details

Product Information

Chemical Base

Blend of inorganic chemicals

Shelf Life

12 months.

Storage Conditions

Store properly in undamaged, original sealed packaging in dry cool conditions at temperatures between +5 °C and +30 °C. Protect from direct sunlight, frost and contamination.

Density

~1.3 g/cm³

pH-Value

~12

Total Chloride Ion Content

≤ 0.1 %

 
Technical Information

Effect on Setting

Sika®-4a 1: 1 water 15 - 45 seconds when mixed with cement at 0.35 L/ 1 kg

Sika®-4a 1: 4 water 5 - 10 minutes when mixed with cement at 0.18 L/ 1 kg

Application

Application Information

Ambient Air Temperature

+5 °C min. / +35 °C max.

Substrate Temperature

+5 °C min. / +35 °C max
Application steps

MIXING

  • Before starting to work with the material wear suitable protective clothes, gloves and googles.
  • Mix Sika®-4a with clean water at the desired dilution rate, depending on the application and water pressure.
  • Pour the liquid into a clean mixing container.
  • Quickly pour the cement in until the liquid is covered (approximately 3 parts of cement to 1 part liquid).
  • Mix the materials quickly and thoroughly into a paste and use immediately. Do not mix more product that can be placed immediately.

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