Company lists · Data refreshed September 2026

Top 25 Fiberglass manufacturers based in the United States

Name: Fiberglass manufacturers based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 643 companies tracked

RevenueBase identified 643 fiberglass manufacturers headquartered in the United States as of September 2026 and tracks 15,890 professional contacts across them, including 4,219 with verified work emails. Houston is the largest hub.

This list covers fiberglass manufacturers headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 16, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 16, 2026 86% judged on-target in blind review

643Companies

15,890Contacts tracked

4,219Verified emails

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The 25 largest fiberglass manufacturers based in the United States

Ranked by team size

Top 25 of 643 fiberglass manufacturers based in the United States, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to fiberglass manufacturers: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Zoltek	Indirect evidence	Saint Louis, United StatesHQ checked Sep 16, 2026	1,001-5,000	628 contacts →
	Indirect evidence “In the world of materials, carbon fiber has emerged as the ultimate team player, one that works miracles in reinforcing other materials and lifting them to new levels of…” Source: RevenueBase Database · checked Sep 16, 2026
2	SPI	Indirect evidence	Charlotte, NC, United StatesHQ checked Sep 16, 2026	1,001-5,000	571 contacts →
	Indirect evidence “SPI is a global leader in the Distribution and Specialty Fabrication of insulation products for Thermal, Acoustic, Fire Protection and Refractory applications.” Source: RevenueBase Database · checked Sep 16, 2026
3	Distribution International	Indirect evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	1,001-5,000	488 contacts →
	Indirect evidence “Distribution International (DI) a leading distributor of thermal and acoustical insulation and related supplies for maintenance and repair operations in the United States.” Source: RevenueBase Database · checked Sep 16, 2026
4	Skaps Industries	Strong evidence	Athens, GA, United StatesHQ checked Sep 16, 2026	501-1,000	452 contacts →
	Strong evidence “SKAPS Industries is a leading manufacturer and supplier of Geosynthetic products and Fiberglass fabric with market presence in over 60 countries.” Source: RevenueBase Database · checked Sep 16, 2026
5	Core Molding Technologies	Indirect evidence	Columbus, OH, United StatesHQ checked Sep 16, 2026	1,001-5,000	441 contacts →
	Indirect evidence “Core Molding Technologies is a leading engineered materials company specializing in molded structural products, principally in building products, utilities, transportation and…” Source: RevenueBase Database · checked Sep 16, 2026
6	Molded Fiber Glass MFG Companies	Indirect evidence	Ashtabula, OH, United StatesHQ checked Sep 16, 2026	1,001-5,000	437 contacts →
	Indirect evidence “MFG's composites expertise is a result of 70 years of service to customers in many industries.” Source: RevenueBase Database · checked Sep 16, 2026
7	Toray Composite Materials America, INC	Indirect evidence	Tacoma, WA, United StatesHQ checked Sep 16, 2026	1,001-5,000	385 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 16, 2026
8	General Insulation Company, INC	Indirect evidence	Medford, MA, United StatesHQ checked Sep 16, 2026	501-1,000	342 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 16, 2026
9	AGY	Partial evidence	Aiken, SC, United StatesHQ checked Sep 16, 2026	501-1,000	325 contacts →
	Partial evidence “AGY is a leading innovator and manufacturer of specialty glass fibers enabling high-performance composite solutions for aviation, defense, electronics, artificial intelligence…” Source: RevenueBase Database · checked Sep 16, 2026
10	BGF Industries, INC	Strong evidence	Danville, VA, United StatesHQ checked Sep 16, 2026	501-1,000	272 contacts →
	Strong evidence “BGF Industries manufactures woven & nonwoven fabrics from fiberglass, carbon, aramids, and other high performance fibers for technical textiles used in the Aerospace, Protective…” Source: RevenueBase Database · checked Sep 16, 2026
11	Quietflex Manufacturing	Strong evidence	Houston, TX, United StatesHQ checked Sep 16, 2026	501-1,000	231 contacts →
	Strong evidence “Quietflex Manufacturing is a manufacturer of Flex Duct for HVAC and Textile Fiberglass products based out of 4518 Brittmoore Rd, Houston, Texas, United States.” Source: RevenueBase Database · checked Sep 16, 2026
12	Mar-Bal, INC	Indirect evidence	Chagrin Falls, OH, United StatesHQ checked Sep 16, 2026	201-500	229 contacts →
	Indirect evidence “THERMOSET COMPOSITES.” Source: RevenueBase Database · checked Sep 16, 2026
13	Strongwell	Indirect evidence	Bristol, VA, United StatesHQ checked Sep 16, 2026	501-1,000	215 contacts →
	Indirect evidence “Strongwell is the world's leading pultruder of fiber reinforced (FRP) structural components.” Source: RevenueBase Database · checked Sep 16, 2026
14	JPS Composite Materials	Indirect evidence	Anderson, SC, United StatesHQ checked Sep 16, 2026	501-1,000	206 contacts →
	Indirect evidence “JPS Composite Materials is an ISO-9001 certified US based weaver of composite reinforcement and ballistic protection fabrics.” Source: RevenueBase Database · checked Sep 16, 2026
15	Fibergrate Composite Structures	Strong evidence	Dallas, TX, United StatesHQ checked Sep 16, 2026	201-500	195 contacts →
	Strong evidence “With six decades of experience in the Fiberglass Reinforced Plastics industry, Fibergrate Composite Structures manufactures and sells the most complete line of high-performance…” Source: RevenueBase Database · checked Sep 16, 2026
16	Xerxes	Strong evidence	Minneapolis, MN, United StatesHQ checked Sep 16, 2026	501-1,000	152 contacts →
	Strong evidence “For over 45 years, Xerxes has designed and manufactured fiberglass storage tanks that provide reliable, secure underground storage for fuel, water and wastewater.” Source: RevenueBase Database · checked Sep 16, 2026
17	Greenfiber	Partial evidence	Charlotte, United StatesHQ checked Sep 16, 2026	201-500	148 contacts →
	Partial evidence “Established in and headquartered in Charlotte, N.C, Greenfiber is the largest manufacturer of cellulose insulation and fire and sound products.” Source: RevenueBase Database · checked Sep 16, 2026
18	CTA Acoustics, INC	Indirect evidence	Madison Heights, MI, United StatesHQ checked Sep 16, 2026	501-1,000	142 contacts →
	Indirect evidence “Innovative Technologies, Quality Manufacturing CTA Acoustics, Inc.” Source: RevenueBase Database · checked Sep 16, 2026
19	Grady-White Boats	Partial evidence	Greenville, NC, United StatesHQ checked Sep 16, 2026	201-500	140 contacts →
	Partial evidence “Grady-White Boats has a legendary reputation for designing and manufacturing premium offshore fiberglass boats from 18 to 45 ft featuring the exclusive SeaV2® hull design with…” Source: RevenueBase Database · checked Sep 16, 2026
20	Federal Foam Technologies	Indirect evidence	New Richmond, WI, United StatesHQ checked Sep 16, 2026	201-500	137 contacts →
	Indirect evidence “Over 75 Years of Excellence Federal Foam Technologies is a custom fabricator of flexible cellular and plastic materials, with capabilities in engineering and research and…” Source: RevenueBase Database · checked Sep 16, 2026
21	Interstate Advanced Materials	Indirect evidence	Sacramento, CA, United StatesHQ checked Sep 16, 2026	201-500	137 contacts →
	Indirect evidence “Founded over four decades ago, Interstate Advanced Materials is a nationwide wholesale distributor of plastics and composite materials, serving a wide range of industries…” Source: RevenueBase Database · checked Sep 16, 2026
22	North American Composites	Indirect evidence	Lino Lakes, MN, United StatesHQ checked Sep 16, 2026	201-500	135 contacts →
	Indirect evidence “North American Composites (NAC) distributes materials and equipment from leading suppliers to the marine and composites industry.” Source: RevenueBase Database · checked Sep 16, 2026
23	A.R.E. Accessories	Indirect evidence	Massillon, OH, United StatesHQ checked Sep 16, 2026	501-1,000	128 contacts →
	Indirect evidence “A.R.E.” Source: RevenueBase Database · checked Sep 16, 2026
24	RPS Composites, INC	Indirect evidence	Mobile, AL, United StatesHQ checked Sep 16, 2026	51-200	125 contacts →
	Indirect evidence “RPS Composites provides engineered dual laminate and FRP pipe and tank solutions to industrial customers for corrosive fluid processing, handling, and storage applications.” Source: RevenueBase Database · checked Sep 16, 2026
25	Kamco Industries, INC	Partial evidence	West Unity, OH, United StatesHQ checked Sep 16, 2026	501-1,000	124 contacts →
	Partial evidence “Established in 1987 in West Unity Ohio, Kamco Industries, a subsidiary of Kumi Kasei, established itself as a full service provider of product design and manufacturer of…” Source: RevenueBase Database · checked Sep 16, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: fiberglass manufacturers. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names fiberglass manufacturers.
Partial evidence: Its own public description names part of fiberglass manufacturers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name fiberglass manufacturers. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 643 fiberglass manufacturers based in the United States

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Fiberglass manufacturers based in the United States at a glance

As of Sep 16, 2026

26.6%Verified-email coverage

24.7Average contacts per company

11-50Median size (employees)

3.0%Largest-city concentration · Houston

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

203

11-50

225

51-200

138

201-500

501-1,000

1,001-5,000

5,001-10,000

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 643 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among fiberglass manufacturers, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “fiberglass manufacturers”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names fiberglass manufacturers), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among fiberglass manufacturers, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 4,219 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 16, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names fiberglass manufacturers, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many fiberglass manufacturers are there based in the United States?

RevenueBase identified 643 fiberglass manufacturers headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Zoltek, headquartered in Saint Louis, tops this list with the largest team on record.

Which city has the most fiberglass manufacturers?

Houston leads with 19 headquartered companies, followed by Elkhart (9) and Sacramento (6).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 4,219 verified decision-maker contacts tracked across these 643 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 16, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.