NAICS 327993

Overview

The North American Industry Classification System (NAICS) is the U.S. government’s standard for classifying business establishments so agencies can collect, analyze, and publish economic statistics. NAICS was created under the Office of Management and Budget (OMB), adopted in 1997 to replace SIC, and jointly developed by the U.S. Economic Classification Policy Committee, Statistics Canada, and Mexico’s INEGI; the current classification vintage is 2022. ¹

NAICS 327993 — Mineral Wool Manufacturing — covers establishments primarily engaged in producing mineral wool and mineral‑wool insulation products from siliceous materials (e.g., rock, slag, glass, or combinations). It sits within Nonmetallic Mineral Product Manufacturing and is used across federal economic series (e.g., the Economic Census) to tabulate industry activity for mineral‑wool and fiberglass insulation manufacturing. ²

See also on G2X:

• G2X — NAICS 327993 overview
• G2X — NAICS 32799 industry group

What this NAICS covers

• Manufacturing mineral wool fibers from rock, slag, glass, or combinations of these siliceous inputs. ²
• Producing mineral‑wool insulation products, including items characterized as “glass wool” or fiberglass insulation. ²
• Forming mineral‑wool products in batts, blankets, boards, or other insulation forms when made from mineral‑wool fibers. Not specified by official sources ²
• Integrating processes that melt/convert raw siliceous materials and draw fibers for insulation applications. Not specified by official sources ²
• Establishment‑level manufacturing where mineral‑wool and fiberglass insulation are the primary outputs. ²
• Excludes steel wool and metallic scouring pad products, which are classified elsewhere. ²

Related NAICS and PSC codes

Type	Code	Descriptor
NAICS	327992	Ground or Treated Mineral and Earth Manufacturing. 2
NAICS	327999	All Other Miscellaneous Nonmetallic Mineral Product Manufacturing. 2
PSC	5640	Wallboard, Building Paper, and Thermal Insulation Materials (includes mineral wool, glass‑wool batts, pipe covering). 3

Classification boundaries and cross‑references

• Fiberglass/glass‑wool insulation is classified in NAICS 327993; glass manufacturing for other glass products is classified in the glass industries, but the production of glass‑wool insulation specifically points to 327993. ²
• Metallic scouring pads and steel wool products are excluded from NAICS 327993 and placed in NAICS 332999. ²

Frequently asked questions

• What does NAICS 327993 include?

  • It covers establishments that manufacture mineral wool and mineral‑wool insulation products from rock, slag, glass, or combinations. The scope explicitly includes fiberglass (glass‑wool) insulation products when manufactured from these siliceous materials. ²

• Does NAICS 327993 include fiberglass insulation?

  • Yes. Census classifies glass‑wool (fiberglass) insulation under 327993; cross‑references in glass manufacturing direct glass‑wool insulation to this NAICS. ²

• Which PSC is commonly used when buying mineral‑wool insulation as a product?

  • PSC 5640 “Wallboard, Building Paper, and Thermal Insulation Materials” explicitly lists mineral wool, glass‑wool batts, and pipe covering among included items. ³

• Are installation services coded under NAICS 327993?

  • No. Installation is a construction activity generally classified under NAICS 238310 Drywall and Insulation Contractors, while 327993 covers manufacturing. ⁵

• When will federal datasets use the 2022 NAICS vintage for this industry?

  • Census began disseminating data on a 2022 NAICS basis with 2022 Economic Census releases and plans to transition remaining NAICS‑based programs by the end of 2027, per the implementation timeline. ⁴

Useful resources

• G2X — NAICS 327993 overview
• Census NAICS — introduction and code search (includes 1997 adoption details and 2022 vintage). ¹
• Census NAICS — Sector 31‑33 content with the official 327993 definition and cross‑references. ²
• Acquisition.gov — PSC Manual (April 2025), official PSC definitions including PSC 5640. ³
• Census — 2022 NAICS implementation timeline and program transition notes. ⁴

References

1. U.S. Census Bureau — NAICS: Introduction and 2022 NAICS search portal. https://www.census.gov/naics/?chart=2022&input=52
2. U.S. Census Bureau — NAICS Sector 31‑33 (Manufacturing) archive content including NAICS 327993 definition and cross‑references. https://www.census.gov/naics/resources/archives/sect31-33.html
3. Acquisition.gov — Product and Service Code (PSC) Manual, April 2025 (official PSC definitions, including PSC 5640). https://www.acquisition.gov/sites/default/files/manual/PSC%20Manual%20April%202025.pdf
4. U.S. Census Bureau — Implementation of the 2022 NAICS (timeline and usage across programs). https://www.census.gov/library/reference/code-lists/naics/2022/implementation-timeline.html
5. U.S. Census Bureau — Employer Categories guidance showing NAICS 238310 Drywall and Insulation Contractors. https://www.census.gov/programs-surveys/esp/guidance/employer.html