Home - News - Details

Glassfiber Mesh: The Microscopic Battle Between Alkaline Environment And Coating Protection

The Silent Struggle

 

When a sheet of fiberglass mesh is embedded in cement mortar, an invisible microscopic battle quietly begins. On one side is the highly alkaline environment generated by cement hydration (pH>12.5); on the other side is the alkali-resistant coating wrapped around each fiber. The outcome of this battle directly determines whether glassfiber mesh can maintain its protective role within walls for over 25 years of service life.

glassfiber mesh was embedded in cement mortar
glassfiber mesh

The Essence of Alkaline Corrosion

 

During cement hydration, large amounts of calcium hydroxide are produced, creating the most threatening corrosive environment for glass fibers. Research confirms that OH⁻ ions attack the silica-oxygen skeleton (Si-O-Si bonds) of the glass fibers, causing network fracture and micro-cracks on the surface. Unprotected ordinary glass fibers will rapidly lose strength in this environment and ultimately fail in their reinforcing function.

The Coating's Protective Mechanism

 

High-quality alkali-resistant mesh constructs three microscopic lines of defense:

The first line of defense lies in the fiber itself. During manufacturing, zirconia (ZrO₂, content 14.5%-16.7%) and titanium oxide are introduced into the glass composition, giving the fibers inherent alkali resistance and resisting alkaline attack at its source. Over time, the chemical state of zirconium gradually stabilizes, forming long-lasting protection.

 

The second line of defense occurs during fiber forming. A water-soluble epoxy sizing agent and coupling agent are applied to the filament surface, enhancing the interfacial bond between the fibers and subsequent alkali-resistant polymers.

 

The third line of defense comes in final product treatment. The woven mesh receives another application of alkali-resistant polymer coating (styrene-butadiene latex + pure acrylic system), applied uniformly through precise control of temperature, speed, and tension. Authoritative testing shows that high-quality alkali-resistant mesh can achieve alkali-resistant strength retention rates of over 91%-far exceeding standard requirements.

 

Who Prevails?

 

 The alkali-resistant coating significantly enhances the tensile breaking strength of the mesh, while the nodal structure of the mesh also contributes importantly to warp-direction tensile strength. Research confirms that coating quality, fiber intrinsic strength, and yarn inter-fiber friction collectively determine the mesh's alkali-resistant breaking strength. A carefully engineered glassfiber mesh maintains its advantage in this microscopic battle over the long term, providing lasting and reliable reinforcement for buildings.

 

This is precisely why we choose high-quality alkali-resistant mesh-not because the coating is invisible, but because we can see the science behind it.

If you have any questions or need assistance, please feel free to contact us:
Office: +86-21-66037922
             +86-21-66037926
Email: sales@galaxy-fiber.com
Mobile: +86-18721503790
GALAXYFIBER 

WhatsApp

Send Inquiry

You Might Also Like