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GLYMO, Glycidyl 3-(trimethoxysilyl)propyl ether, 3-(2,3-Epoxypropoxy)propyltrimethoxysilane
Empirical Formula (Hill Notation):
CAS Number:
Molecular Weight:
EC Number:
MDL number:
PubChem Substance ID:

Quality Level





refractive index

n20/D 1.429 (lit.)


120 °C/2 mmHg (lit.)


1.07 g/mL at 25 °C (lit.)

SMILES string




InChI key


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General description

(3-Glycidyloxypropyl)trimethoxysilane (GPTMS) is a bifunctional organosilane with three methoxy groups on one side and an epoxy ring on the other. The methoxy groups bind well with glass substrates creating a 3D matrix. The epoxy group is reactive with amides, alcohols, thiols and acids. GPTMS is highly reactive in water and can be used as a linking agent between the surface of the silica and the polymeric matrix.


Pre-treatment of carbon steel with 3-(Glycidoxypropyl)trimethoxysilane enhances the dry and wet adhesion while reducing the cathotic disbondment rate of an epoxy coating
GPTMS is widely used as a silica precursor. GPTMS alone with tetraethylortosilicate (TEOS) can be blended with chitosan for use as a filler for polymeric scaffold for bone tissue engineering. It can also be coated on the surface of aluminium alloy to protect from corrosion. GPTMS can used to functionalize (wrap) multi-walled carbon nanotubes (MWCNTs) which can be used as s a reinforcement in epoxy matrix nanocomposites.


1 L in glass bottle
100, 500 mL in Sure/Seal™



Signal Word


Hazard Statements

Hazard Classifications

Aquatic Chronic 3 - Eye Dam. 1

Storage Class Code

10 - Combustible liquids



Flash Point(F)

235.4 °F - closed cup

Flash Point(C)

113 °C - closed cup

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificate of Analysis

Enter Lot Number to search for Certificate of Analysis (COA).

Certificate of Origin

Enter Lot Number to search for Certificate of Origin (COO).

  1. Which document(s) contains shelf-life or expiration date information for a given product?

    If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis.

  2. How do I get lot-specific information or a Certificate of Analysis?

    The lot specific COA document can be found by entering the lot number above under the "Documents" section.

  3. Is Product 440167 (3-Glycidyloxypropyl)trimethoxysilane GLYMO, equivalent to Dow's Z-6040?

    Yes. This listing is manufactured by Dow Corning Corporation and distributed by Sigma-Aldrich.

  4. What can Product 440167, 3-Glycidyloxypropyl)trimethoxysilane GLYMO, be used for?

    According to Dow Corning®, 3-GLYCIDOXYPROPYLTRIMETHOXYSILANE can be used as a coupling agent for many thermoset resins with glass or  mineral fillers. Specifically, it has been used as a reinforcement treatment on glass fiber to improve physical properties (especially wet strength) or as  an adhesion promoter to improve the bonding of a polymer coating or adhesive to glass, metals or other polymeric surfaces.

  5. What is the viscosity of Product 440167 (3-Glycidyloxypropyl)trimethoxysilane GLYMO?

    This material is a low viscosity liquid with an average value of about 3 centistokes. Please note that this value is not part of our specifications.

  6. Where can I find more detailed information about how to use Product 440167. 3-Glycidyloxypropyl)trimethoxysilane, GLYMO, in adhesion/reinforcement applications?

    Dow Corning® has published a technical bulletin on this product, which is available by calling Technical Service at 800-231-8327.

  7. How do I find price and availability?

    There are several ways to find pricing and availability for our products. Once you log onto our website, you will find the price and availability displayed on the product detail page. You can contact any of our Customer Sales and Service offices to receive a quote.  USA customers:  1-800-325-3010 or view local office numbers.

  8. What is the Department of Transportation shipping information for this product?

    Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product. 

  9. My question is not addressed here, how can I contact Technical Service for assistance?

    Ask a Scientist here.

Room temperature ionic liquids for epoxy nanocomposite synthesis: Direct dispersion and cure.
Throckmorton JA, et al.
Composites Science and Technology, 86(47), 38-44 (2013)
Ahmed A Nada et al.
International journal of biological macromolecules, 133, 538-544 (2019-04-22)
Homogenous allocation of inorganic particles in a polymeric matrix is a challenge. In this work, we discuss electrospinning of chitosan /gelatin using CS-Si (chitosan silicone hybrids) as well as the formation of homogeneously distributed Zn elements inside chitosan nanofiber through
Organic-inorganic bonding in chitosan-silica hybrid networks: physical properties.
Trujillo, et al.
Journal of Polymer Science. Part B, Polymer Physics, 53(19), 1391-1400 (2015)
An assessment of the corrosion protection of AA2024-T3 treated with vinyltrimethoxysilane/(3-glycidyloxypropyl) trimethoxysilane.
Dalmoro V et al.
Corrosion Science, 92(19), 200-208 (2015)
Ngoc-Hanh Cao-Luu et al.
Journal of colloid and interface science, 536, 536-547 (2018-11-06)
How to encapsulate poly(N-isopropylacrylamide) (PNIPAM) mesoglobule cores by silica shells greatly affects the resultant nanoparticle structures. Incorporation of acrylamide (AM) unit into PNIPAM in combination with 3-glycidyloxypropyltrimethoxysilane (GLYMO, as a coupling agent) effectively induces nucleation and growth of silica on


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