325991 — Custom Compounding of Purchased Resins
Description
This U.S. industry comprises establishments primarily engaged in (1) custom mixing and blending plastics resins made elsewhere or (2) reformulating plastics resins from recycled plastics products (as defined in the official U.S. Census Bureau 2022 NAICS Manual).
Exclusions & Cross-References
- Establishments primarily engaged in manufacturing synthetic resins and custom mixing and blending resins are
- classified in U.S. Industry 325211, Plastics Material and Resin Manufacturing.
Overview Facts
Legacy SIC Concordance
Trace the historical mapping chain from the 1987 Standard Industrial Classification (SIC) to the modern 2022 NAICS code format.
- SIC 3087 - Custom Compounding of Purchased Plastics Resins (via SIC1987:3087→NAICS1997:325991→2002:325991→2007:325991→2012:325991→2017:325991→2022:325991)
Suggested Product Service Codes (Advisory)
The following Product Service Codes (PSCs) are advisory suggestions aligned with this NAICS code. Note: NAICS and PSC codes map to different dimensions of procurement (industry vs. product/service). There is no official binding 1:1 crosswalk.
- PSC 3620 — Rubber and Plastics Working Machinery
Source: DoD DPCAP PSC Selection Tool (Ingested: 2026-06-29)
Frequently Asked Questions (FAQ)
Is NAICS code 325991 valid in 2022? ▾
Yes, 325991 is a valid 6-digit 2022 NAICS national industry code representing 'Custom Compounding of Purchased Resins' under Sector 31-33 in the official classification index.
What is the SBA size standard for NAICS code 325991? ▾
The Small Business Administration (SBA) has established a small business size standard of 600 employees for NAICS code 325991 (Custom Compounding of Purchased Resins), calculated based on employees.
What is the legacy SIC equivalent for NAICS 325991? ▾
According to official Census Bureau concordance tables, NAICS code 325991 (Custom Compounding of Purchased Resins) maps to legacy 1987 Standard Industrial Classification (SIC) codes: 3087 - Custom Compounding of Purchased Plastics Resins.
Related Pages & Tools
Further regulatory reference links for NAICS code 325991:
- Sector 31-33 Directory Hub — List of related industries in the Manufacturing sector.
- SIC ↔ NAICS Crosswalk Tool — Look up mappings between legacy SIC codes and modern classifications.
- NAICS 325991 to SIC Crosswalk — Bidirectional mapping to legacy SIC codes (Custom Compounding of Purchased Resins).
- SBA Size Standards Guide — Complete rules and averaging periods for small business classifications.
- Calculating Annual Receipts Guide — Detailed worked example of revenue calculation rules.
- IRS Principal Business Activity Guide — How NAICS codes map to corporate and entity tax filings.