Name: Epoxy Silane Adhesion Promoter for Sealants ESS-187
Brand: Coatingsink
SKU: epoxy-silane-sealant-adhesion
Availability: InStock

Question 1

Why does ESS-187 bond to both organic and inorganic substrates?

Accepted Answer

ESS-187 (3-glycidoxypropyltrimethoxysilane) carries two reactive sites: three hydrolysable methoxy groups that condense with surface silanols on glass, concrete, and metals, and an epoxide group that co-reacts with amine, anhydride, or thiol hardeners in the sealant's organic phase. This bifunctional architecture creates covalent bonding across the organic–inorganic interface.

Question 2

How should ESS-187 be added to a two-component epoxy sealant formulation?

Accepted Answer

Incorporate ESS-187 at 0.1–1.0% into the epoxy resin component before mixing with the amine hardener. In aqueous or waterborne systems, pre-hydrolyze ESS-187 at 1–5% in a water/isopropanol blend at pH 3.5–5.5 for 30 minutes before addition to ensure complete silanol formation.

Question 3

Can ESS-187 replace a conventional primer step in construction sealant applications?

Accepted Answer

In many cases, yes. When formulated at 0.5–1.0% into the sealant, ESS-187 migrates to the substrate interface during cure and forms an in-situ adhesion layer. For demanding structural joints or contaminated substrates, a dilute ESS-187 primer solution (2–5% in isopropanol, pH-adjusted to 4–5) is still recommended prior to sealant application.

Purity (GC)	≥98%
Density (25°C)	1.070 g/ml
Methoxy Content	37.5%
Viscosity (25°C)	5–10 mPa·s
Epoxide Equivalent Weight	236 g/mol

Epoxy Silane Adhesion Promoter for Sealants ESS-187

Specifications

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