Fiberglass Product Testing

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Glass Fiber Testing

Glass fiber is an inorganic non-metallic material manufactured from raw materials such as pyrophyllite and quartz sand through processes including high-temperature melting and drawing. The diameter of a single filament ranges from a few microns to over twenty microns (approximately 1/20 to 1/5 of a human hair). It features high strength, temperature resistance, dimensional stability, insulating properties, and flame retardancy. The global average annual growth rate of glass fiber production is 1.5 to 2 times the GDP growth rate. China‘s GDP growth rate (6%) drives downstream demand in sectors such as wind power, construction, and electronics. Global glass fiber production capacity is concentrating in China. In 2022, the combined production capacity of Jushi Group, Taishan Fiberglass (Sinoma), and Chongqing Polycomp International Corporation (CPIC) accounted for 63% of the national total, creating significant economies of scale.

Testing Products

E-Glass (Electrical/Calcium-Aluminosilicate) Fiber

C-Glass (Medium alkali/Corrosion-resistant) Fiber

A-Glass (High alkali) Fiber

Specialty Glass Fibers (e.g., Quartz, D-Glass)

Continuous Filament (Long fiber)

Discontinuous / Staple Fiber (Short fiber)

High-Strength Glass Fiber (S-Glass / R-Glass)

Low Dielectric Constant Glass Fiber (D-Glass / quartz)

Chopped Strands

Glass Fiber Fabric / Woven Roving

Testing Items

Glass Composition (Chemical analysis)

Glass Density

Moisture Content

Combustible Matter Content (LOI / Size content)

Fiber Diameter

Linear Density (Tex)

Stiffness (Handle-o-meter / Cantilever)

Chopped Strand Integrity / Dispersibility

Breaking Strength / Tenacity (Strand / Single filament)

Wet-out Rate (Resin penetration / Transparency)

Drape (Conformability / Flexibility)

Mechanical Properties of Impregnated Yarn (Strand)

Short Beam Strength of Annular Specimens (Interlaminar shear)

Mechanical Properties of Unidirectional Laminates (Composite test)

Twist Direction and Twist Level (TPM)

Mass per Unit Area (Fabric / Mat)

Tensile Breaking Force (Fabric / Roving)

Testing Standards

Glass Fiber Rovings (including alkali-resistant and high-strength types for winding):

GB/T 18369-2022 (including Amendment 1), JC/T 572-2012, JC/T 953-2005

Continuous Glass Filament Yarns:

GB/T 18371-2008

Glass Fiber Sewing Thread:

JC/T 573-2023

Chopped Glass Fiber Strands:

JC/T 896-2002

Glass Fiber Mats (chopped strand mats, continuous filament mats, wet-laid mats):

GB/T 17470-2007, GB/T 26733-2011

Glass Fiber Fabrics (E-glass fabric, printed circuit board fabric, high-strength fabric, high-silica fabric, woven roving, unidirectional fabric, wall-covering fabric, insect screening, resin-bonded grinding wheel mesh, alkali-resistant mesh, architectural membrane, sleeving braid):

JC/T 170-2012, GB/T 18373-2013, GJB 84B‑2020, GJB 1873‑1994, GB/T 18370‑2014, GB/T 29754‑2013, JC/T 996‑2006, JC/T 173‑2005, JC/T 561.1‑2006, JC/T 841‑2024, GB/T 25042‑2010, JC/T 175‑2007

E-Glass Fiber Tape:

JC/T 174-2005

Glass Fiber Rope for Rubber Reinforcement:

JC/T 589-2008

Glass Fiber Geogrids:

GB/T 21825-2008

Glass Fiber Stitched Fabrics / Multiaxial fabrics:

GB/T 25040-2010

Glass Fiber Filter Materials:

GB/T 25041-2016

Service Advantages

The company hosts the National Center for Quality Inspection and Testing of Glass Fiber Products, holding national-level CMA qualification and CNAS laboratory accreditation.

As the lead drafter, the company has formulated or revised over 30 national and industry standards in the field of high-performance fibers and products, such as JC/T 170-2012 and GB/T 18373-2013.

Specializing in testing in the thermal insulation and fiber fields for over 60 years.