Nanjing SiSiB Silicones Co., Ltd.
Nanjing SiSiB Silicones Co., Ltd.
SiSiB® WR4004
SiSiB® WR4004

Silicone Water Repellent Emulsion

SiSiB® WR4004 Emulsion is a 40% active non ionic emulsion containing alkoxysilanes. Silanes are well known for their ability to provide hydrophobicity and decrease dramatically the water ingress of cementitious materials. Silane supplied in emulsion can chemically react with cement hydrate during cement cure. Alcohol is released upon reaction of the silanes.

SiSiB® WR4004 silicone based water repellent is a water based silane emulsion which can be used as admixture in cementitious materials.

Silanes react chemically within the cementitious matrix and provide integral water repellent treatment

Treated cement-based materials are resistant against water absorption throughout the material.

As a water based emulsion, SiSiB® WR4004 Emulsion provides easy incorporation of silanes in cement-based slurry.

SiSiB® WR4004 Emulsion can be used as supplied or diluted in water prior to addition in cement slurry.

SiSiB® WR4004

Technical Data

Color and Appearance

Milky White Liquid

Active Ingredient





  • It is advised to stir SiSiB® WR4004 Emulsion prior to its application.

  • SiSiB® WR4004 Emulsion containing alkoxy silanes can be used as supplied or can be diluted in water before use. The water should be added to the emulsion with low shear mixing. Deionized water is recommended for dilution. After dilution, it is advised to make sure the pH is maintained in the 5-9 range. To prevent mold growth within the package, additional preservative may be required if the diluted emulsion is expected to be stored.

  • SiSiB® WR4004 water dilutable emulsified silane can be used as an admixture to cementitious mixtures at levels between 0.2 to 0.5% by weight of SiSiB® WR4004 Emulsion as supplied based on the dry composition weight.

  • If calculated to cement mass, an addition level of SiSiB® WR4004 Emulsion between 1 and 2% vs cement is advised.

  • It is however strongly advised to carry out an evaluation of SiSiB® WR4004 Emulsion addition on the physical properties of the targeted cement-based materials prior to any use in full scale application.

  • SiSiB® WR4004 is used as a silane surface modifier to generate hydrophobictity (e.g. concrete, glass, inorganic pigments, or mineral fillers).

Packing and Storage

  • SiSiB® WR4004 is supplied in 200Kg steel drum or 1000Kg IBC tote.

  • In the unopened container SiSiB® WR4004 has a shelf life of 6 months. Storage beyond the date specified on the label does not necessarily mean that the product is no longer usable. In this case however, the properties required for the intended use must be checked for quality assurance reasons.

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SiSiB® WR4004