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  • Methacryloylpropyltrimethoxysilane IOTA-70

    3-Methacryloylpropyltrimethoxysilane IOTA-70

    Product article: IOTA-70


    3-Methacryloylpropyltrimethoxysilane is a methacryl-functional silane, it is a clear, light and heat sensitive liquid with a faintly sweet odour.

    3-Methacryloylpropyltrimethoxysilane is used as adhesion promoter at organic/inorgainc interfaces, as surface modifier (e.g. imparting water repellency, organophilic surface adjustment) or as crosslinking of polymers). It is used as a coupling agent to improve the physical and electrical properties of glass-reinforced and mineral-filled thermosetting resins under exposure to heat and/or moisture. It is typically employed as a blend additive in resin systems that cure via a free radical mechanism (e.g. polyester, acrylic) and in filled or reinforced thermoplastic polymers, including polyolefins and polyurethanes. It is also used to functionalize resins via radical initiated processes - copolymerization or grafting - and to modify surfaces.

    Physical Properties

    Formula: C10H20O5Si

    Molecular Weight: 248.4
    Molecular structure: 

    Appearance: Colorless transparent liquid

    Density: 1.045

    Boiling Point: 255(760mmHg)

    Refractive Index: 1.4290±0.0005
    Viscosity: 2 cst

    Flash Point: 108

    CAS No.: 2530-85-0

    EINECS No.: 219-785-8

    Min. Purity: 98.0%


    3-Methacryloylpropyltrimethoxysilane is soluble in methanol, ethanol, isopropanol, acetone, benzene, toluene, and xylene. After hydrolysis, it is soluble in water with adequate stirring if the pH is adjusted to 4.0. Hydrolysis releases methanol.

    3-Methacryloylpropyltrimethoxysilane shows copolymerization or grafting reactions when catalyzed by (organic) initiator systems, e.g. peroxides or by radiation (e.g. UV).


    1. Improves strength as glass fiber size composite in reinforced polyester composites.

    2. Enhances initial and wet strength of reinforced polyester resin composites.

    3. Enhances the wet electrical properties of many mineral-filled and reinforced composites.

    4. Crosslinks acrylic type resins improving adhesion and durability of adhesives and coatings.

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