What is the U.S. tariff rate on glass fiber and reinforcements?

USITC calculated duties imply an effective rate of 10.73% in Jun 2026 (calculated duties ÷ covered customs value, USITC DataWeb). The parseable Column 1 General line-rate range is 0%–7.3%; individual lines are called “Free” only when the official General field is literally Free, and product, origin, preference and tariff mix can contribute to the observed-rate difference.

What are the statutory MFN line rates for glass fiber and reinforcements?

The parseable Column 1 General line-rate range is 0%–7.3% across the family's 59 eight-digit HTS lines in the 2026 Harmonized Tariff Schedule (headings 7019). “Free” means the official General field is literally Free for a line; it does not determine final entry liability.

Which countries supply the most glass fiber and reinforcements to the U.S.?

Top retained sources in 2025: Mexico ($403.2M at 1.4%), Canada ($243.2M at 0.89%), China ($186.6M at 49.5%). Mexico holds 28.6% of total family import customs value. Retained sources cover 80.6%; their HHI is 1360, a lower bound whose floor falls in the diversified range without classifying the omitted tail.

How much glass fiber and reinforcements does the U.S. import?

$1.4B of customs value in 2025, with $172.2M in USITC Calculated Duties — an effective calculated-duty rate of 12.2%.

Is the U.S. a net importer of glass fiber and reinforcements?

Yes — a net importer in 2025: $1.4B imported vs $1.1B exported (exports are 77% of imports).

Tariff monitor · Other Families

Glass Fiber and Reinforcements: Statutory & Effective Tariff Rates

USITC Column 1 General rates for 59 glass fiber and reinforcements HTS lines (parseable range 0%–7.3%). Effective rate Jun 2026: 10.73%; monthly history since 2023.

The short answer

The observed effective calculated-duty rate on U.S. imports of glass fiber and reinforcements was 10.73% in Jun 2026, down from 12.36% a year earlier — USITC Calculated Duties divided by covered customs value. The Column 1 General line-rate range is 0%–7.3% across 59 HTS lines in the 2026 schedule; individual lines are called “Free” only when the official General field is literally Free, which still does not determine a shipment’s final duty. Mexico is the largest source, holding 28.6% of 2025 imports.

Statutory rates from the schedule

Glass fibers, rovings, mats, and woven fabric — the reinforcement behind composite tooling, panels, and molded parts. This family covers HTS heading 7019: 59 eight-digit rate lines with a parseable Column 1 General range of 0%–7.3% in the 2026 schedule. “Free” means the official General field is literally Free for that line; it does not determine final entry liability.

Observed calculated-duty data

Latest month on record (2026-06): 10.73% effective on $136.4M of imports, versus 12.36% in the same month a year earlier. The monthly archive holds 42 observations from 2023-01 through 2026-06.
In 2025, U.S. imports for consumption in this family totaled $1.4B in customs value, with $172.2M in USITC reported calculated duty on $1.4B of covered customs value: an effective calculated-duty rate of 12.2%. The aggregate reflects the recorded entry mix but does not attribute the result to a specific legal provision.
A year earlier the effective calculated-duty rate was 6.51%, so the observed rate rose 5.7 points.
Top source countries in 2025: Mexico ($403.2M at 1.4%), Canada ($243.2M at 0.89%), China ($186.6M at 49.5%), Taiwan ($70.9M at 14.3%), Germany ($63.1M at 11.43%).
Reported freight and insurance equaled 8.85% of covered customs value in 2025 ($100.7M total); charge coverage was 80.6% of customs value, from USITC DataWeb. It is shown alongside the effective calculated-duty rate and is not part of the customs-value duty base.
For scale, 2025 imports in this family equal 0.8% of the U.S. nonmetallic mineral products industry's $176B gross output (2025, BEA).

Representative rate lines

7019.11.00.00: Chopped strands, of a length of not more than 50 mm · MFN 4.9%
7019.12.00: Rovings · MFN 4.8%
7019.13.05.00: Fiberglass rubber reinforcing yarn, made from electrically nonconductive continuous fiberg · MFN Free
7019.13.15: Other · MFN 6.5%
7019.13.24.00: Fiberglass rubber reinforcing yarn, made from electrically nonconductive continuous fiberg · MFN Free
7019.13.28.00: Other (201) · MFN 7%
7019.13.35.00: Other · MFN 4.2%
7019.14.00.00: Mechanically bonded mats · MFN 4.3%

Frequently asked questions

What is the U.S. tariff rate on glass fiber and reinforcements? USITC calculated duties imply an effective rate of 10.73% in Jun 2026 (calculated duties ÷ covered customs value, USITC DataWeb). The parseable Column 1 General line-rate range is 0%–7.3%; individual lines are called “Free” only when the official General field is literally Free, and product, origin, preference and tariff mix can contribute to the observed-rate difference.
What are the statutory MFN line rates for glass fiber and reinforcements? The parseable Column 1 General line-rate range is 0%–7.3% across the family's 59 eight-digit HTS lines in the 2026 Harmonized Tariff Schedule (headings 7019). “Free” means the official General field is literally Free for a line; it does not determine final entry liability.
Which countries supply the most glass fiber and reinforcements to the U.S.? Top retained sources in 2025: Mexico ($403.2M at 1.4%), Canada ($243.2M at 0.89%), China ($186.6M at 49.5%). Mexico holds 28.6% of total family import customs value. Retained sources cover 80.6%; their HHI is 1360, a lower bound whose floor falls in the diversified range without classifying the omitted tail.
How much glass fiber and reinforcements does the U.S. import? $1.4B of customs value in 2025, with $172.2M in USITC Calculated Duties — an effective calculated-duty rate of 12.2%.
Is the U.S. a net importer of glass fiber and reinforcements? Yes — a net importer in 2025: $1.4B imported vs $1.1B exported (exports are 77% of imports).

About this data

Reference statistics derived from USITC published data. Not a customs ruling. MFN-Free and Special-rate fields describe statutory line coverage only; final entry liability requires origin, date, eligibility, exclusions and other transaction facts. Calculated Duties are statistical estimates, not a cash-collections ledger. Confirm classification, origin, program eligibility, and final entry liability with a licensed customs broker.

Last reviewed 2026-08-31.