Fiberglass

Minerals for High-Performance Glass Fiber Production

Fiberglass production depends on precise control of raw material chemistry and melt behavior. Variations in silica purity, alumina content or particle size can impact viscosity, fiber formation and overall production efficiency. During manufacturing, molten glass is drawn through fine openings to form continuous fibers, making consistency in the melt critical to maintaining fiber quality and pull rates.

Covia provides high-quality silica sand and complementary minerals engineered to support uniform melts, stable viscosity and reliable fiber production. With advanced processing and a dependable supply network, we help manufacturers optimize performance across insulation and composite fiberglass applications.

Glass Fiber for Insulation and Reinforced Composite Applications

Silica sand for fiberglass production and mineral solutions that support fiber formation, viscosity control and efficient glass fiber manufacturing.

COMPOSITE FIBERGLASS

Composite reinforced fiberglass combines glass fibers with resins to create lightweight materials with high strength and durability. These materials are used in wind turbine blades, automotive components, marine structures and aerospace applications. Consistent raw materials are critical to maintaining fiber strength and production efficiency.

INSULATION FIBERGLASS

Fiberglass insulation is widely used in residential and commercial construction due to its thermal performance, cost efficiency and ease of installation. Manufacturers require stable raw materials to support consistent fiber formation and product quality.

Explore our full portfolio of products

GLASSIL®

High-Purity Glass Sand

PURESIL®

Extra Low Iron Glass Sand

MATRIX®

Feldspathic Glassy Phase Promoter

SILEX®

Glass Grade Ground Silica

FG™

Fiberglass Kaolin

The Mineral Inputs That Drive Fiberglass Performance

SILICA SAND
Silica sand for fiberglass production must support precise viscosity control during fiber drawing. Consistent chemistry and particle size help maintain stable melt conditions, enabling uniform fiber formation and minimizing defects during high-speed production.

ALUMINA
Kaolin and other alumina sources play a critical role in fiberglass production. Higher alumina content improves strength, durability and thermal resistance in finished fibers.

FLUXES
Fluxing agents help reduce melting temperature and support efficient furnace operation. In fiberglass production, effective fluxing is critical to maintaining stable viscosity and consistent melt behavior during fiber drawing.

REDOX AND IMPURITY CONTROL
Iron, carbon and sulfur levels must be carefully managed to control redox conditions and maintain stable viscosity during fiber formation. Proper redox balance supports consistent melt behavior and improves overall fiber quality.

Fiberglass Performance Starts with Material Control

In fiberglass production, material control is vital for uniform viscosity, efficient fiber drawing and consistent product quality. Covia delivers in-spec silica sand and mineral solutions backed by processing expertise and supply reliability to support fiber formation and melt stability.

STABLE MELT CHEMISTRY AND VISCOSITY CONTROL

Viscosity is highly sensitive to glass chemistry and temperature, making consistent raw materials essential for stable fiber formation and process control.

CONTROLLED PARTICLE SIZE FOR MELT EFFICIENCY

A consistent distribution of coarse and fine grains supports efficient batching, uniform melting and reduced unmelted particles—helping maintain stable fiber formation and production efficiency.

ALUMINA CONTENT FOR STRENGTH AND DURABILITY

Controlled alumina levels improve fiber strength and durability, which is critical for both composite and insulation applications.

CONSISTENT FIBER FORMATION AND PULL RATES

Uniform melt conditions allow manufacturers to maintain steady pull rates and reduce fiber breakage during production.

Expert Technical Collaboration

Covia’s technical team works with manufacturers to address batch formulation, viscosity control and melt performance, providing insights based on testing and application experience.

Reliable Logistics and Supply Continuity

Covia’s North American footprint and distribution network help ensure consistent material availability for fiberglass production, supporting uninterrupted operations and cost control.