Abstract
N-Octyltriethoxysilane (CAS No. 2943-75-1), silane coupling agent KH-832, is a monomeric medium-chain alkylfunctional silane. KH-832 is a clear colorless liquid and soluble in common non-polar organic solvents (e. G. Petroleum ether, toluene). However its low volatility and viscosity make KH-832 an easy-to-handle additive. During the hydrolysis reaction between water and KH-832 a certain amount of ethanol (VOC) is released.

Identification
Name    n-Octyltriethoxysilane
Synonyms    Triethoxyoctylsilane
Molecular Formula    C14H32O3Si
Molecular Weight    276.49
CAS Registry Number    2943-75-1
EINECS    220-941-2

Equivalents
Momentive (formerly OSi Specialties ) Silquest A-137  
Dow Corning Z-6341  
EVONIK Degussa Dynasylan OCTEO  
UCT Specialties (formerly Petrarch) O9835

Properties
Density    0.88
Boiling point    265 C degree
Viscosity    2 mPa. S
Flash point    109 C degree
Water solubility    REACTS

Application
N-Octyltriethoxysilane (CAS No. 2943-75-1), silane coupling agent KH-832, is an important additive for many applications. Examples are:
KH-832 silane can be used as a surface modifier to generate hydrophobicity (e. G. On concrete, glass, inorganic pigments, or mineral fillers). The medium-chain alkyl functionality results in unique compound properties when KH-832 treated minerals or pigments are incorporated into polymers, e. G. Polyethylene or polypropylene. Loading levels of 0.5 to 1.5% wt. KH-832 based on the weight of filler or pigment are typically recommended.
KH-832 silane can also be used to improve the compatibility of mineral fillers or pigments in polyolefins or to ease their dispersion in nonpolar matrices.
KH-832 silane is a small molecule to allow for deep penetration into the cementitious surface. This material reacts with moisture in the air and in the substrate in the presence of an alkaline or acidic environment to produce hydroxy groups. These hydroxy groups will bond with the substrate and itself to produce a hydrophobic treatment that inhibits water absorption into the substrate. An alkaline environment, such as new concrete, will catalyze the reaction and speed the formation of the hydrophobic surface.