Protectosil® 300 S

Clear, 100%, VOC-compliant silane for bridge decks, cast-in-place, precast, and other high-strength concrete.

PRODUCT OVERVIEW:

Protectosil® 300 S is a clear, penetrating, breathable VOC-compliant surface treatment for use on concrete which creates a deep hydrophobic layer to prevent water and waterborne contaminants from entering the substrate and causing premature eterioration. As an isobutylalkoxy functional silane, this product allows for faster dry times and superior performance on high quality mix designs typical of new bridge decks.

APPLICATIONS:

For use on cast-in-place, precast, GFRC and high-strength concrete, to protect the reinforcing steel from corrosion due to the effects of water, deicing salts and other waterborne contaminants. Alleviates deterioration of concrete due to alkali-silica reactivity. For use on bridge decks where fast drying is needed to minimize lane closures. For treating heavy-traffic wearing surfaces or areas that receive high salt concentrations (piers, coastal buildings), to provide a high-performance, long-lasting chloride screen.

Download

KEY FEATURES & BENIFIT

Excellent resistance to chloride ion ingress

100% Moisture vapor transmission

Deep penetration into substrate

High resistance to alkali attack

Excellent performance on wearing surfaces

Dry time 1 hour at 70°F (21°C)

Evonik is one of the world’s leading specialty chemicals companies. Protectosil® represents our commitment to innovation, quality, and long-term surface protection across industries.

© 2025 Evonik Industries AG. All rights reserved. Protectosil® is a registered trademark of Evonik Operations GmbH.