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SITCSection 6
U.S. imports of glass fibers (including glass wool) and related articles (SITC 66495) totaled $78.4M in April 2026, traded with 55 countries.
Importers of Glass Fibers (Including Glass Wool) and Related Articles paid $6.7M in duties in April 2026 — an effective duty rate of 19% on $34.4M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 2026 dataGlass fibers—ranging from continuous filament rovings and woven fabrics used in fiber-reinforced plastics to discontinuous glass wool used for thermal and acoustic insulation—represent one of the most commercially significant advanced-materials categories in this section. Continuous-filament glass fiber reinforcements are a primary input for wind turbine blades, automotive composites, and printed circuit board substrates, while glass wool batts and rolls are staple construction insulation products. Section 301 tariffs have affected glass fiber imports from China, and the product's dual role in both construction and high-performance composites means buyers span a wide range of industries with very different specification requirements.
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Continuous-filament glass fibers are drawn into long, uniform strands used as structural reinforcements; glass wool consists of short, randomly oriented fibers produced by centrifugal or flame-attenuation processes and used primarily for insulation. Both fall within this heading, but they are typically separated at the HTS subheading level, so accurate product-form descriptions on commercial invoices are essential.
Wind energy (blade laminates), automotive lightweighting, marine hull construction, and printed circuit board manufacturing are the primary drivers for continuous-filament reinforcement products. Building and HVAC insulation dominate demand for glass wool. These sectors have distinct quality and certification requirements, so specification sheets and mill test reports are standard documentation for commercial shipments.
| Country | Imports | Exports | Balance |
|---|---|---|---|
| MEXICO | $19.4M | $33.7M | +$14.2M |
| CANADA | $24.1M | $26.4M | +$2.4M |
| CHINA | $7.2M | $3.4M | -$3.7M |
| GERMANY | $4.5M | $1.6M | -$3.0M |
| UNITED KINGDOM | $3.4M | $2.6M | -$801K |
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Monthly import values over time