Nanjing SiSiB Silicones Co., Ltd.
Nanjing SiSiB Silicones Co., Ltd.
SiSiB® PC2521
SiSiB® PC2521

3-Ureidopropyltriethoxysilane (50% in Methanol)

SiSiB® PC2521 is a bifunctional organosilane having a reactive organic ureido group and a hydrolyzable inorganic triethoxysilyl group. 

The dual nature of its reactivity allows SiSiB® PC2521 to bind chemically to both inorganic materials (e.g. glass, metals, fillers) and organic polymers (e.g. thermosets, thermoplastics, elastomers), functioning as an adhesion promoter and as a silane surface modifier. SiSiB® PC2521 is a 50% solution of silane in methanol; it is a colorless liquid with an alcohol-like odor and is soluble in alcohols, ketones, esters or aromatic hydrocarbons. SiSiB® PC2521 gamma Ureidopropyltriethoxysilane (50% in Methanol) is the equivalent of Momentive's A-1160, Dow's Z-6676, Evonik's Dynasylan 2201, ShinEtsu's KBE-585 silane.

SiSiB® PC2521

Technical Data


116912-64-2 or 23779-32-0





Molecular Weight


Boiling Point

No data °C [760mmHg]

Flash Point


Color and Appearance

Colorless transparent liquid

Density 25/25°C


Refractive Index



50% in Methanol

We also can supply pure gamma-Ureidopropyltriethoxysilane (CAS 23779-32-0) without methanol solvent.


  • SiSiB® PC2521 can be used with such polymers as epoxy, phenolic, furan and melamine resins, polyurethanes, PA, PBT, PE, EVA, PP, PVB, PVAC, acrylics and silicones.

  • SiSiB® PC2521 can be used as a size constituent of finish for glass fiber/glass silicone fabric composites.

  • SiSiB® PC2521 can be used as an additive to phenolic, furan and melamine resins for foundry resins and abrasives.

  • SiSiB® PC2521 can be used as an additive for sealants and adhesives.

  • SiSiB® PC2521 can be used as an silicone additive and/or primer for paints and varnishes to improve adhesion to the substrate.

  • The most important effects which can be achieved using PC2521 are improvements in product properties, such as:

  • Improved mechanical properties: e.g. flexural strength, tensile strength, impact strength, modulus of elasticity.

  • Improved resistance to moisture and corrosion.

  • Higher temperature of deflection under load.

Packing and Storage

  • SiSiB® PC2521 is supplied in 180Kg steel drum.

  • In the unopened original container SiSiB® PC2521 has a shelf life of one year in a dry and cool place.

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SiSiB® PC2521