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.
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
| NAICS Code | 325991 |
|---|---|
| Industry Title | Custom Compounding of Purchased Resins |
| SBA Size Standard | 600 employees |
| U.S. Establishments | 414 (Census CBP, 2023) |
| IRS PBA Code | 325900 (rolled-up match) |
| Sectors Hierarchy | Sector 31-33 → 325 → 3259 |
| Source / Verified | US Census 2022 NAICS Manual, Census CBP / 2026-06-28 |
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)
Related Resources & Compliance Guides
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.
- 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.
Related Industries in 3259
Frequently Asked Questions (FAQ)
Is 325991 a valid 2022 NAICS code?
NAICS 325991 is 'Custom Compounding of Purchased Resins', a 2022 U.S. national industry under Sector 31-33 (Manufacturing); the SBA small-business size standard is 600 employees.
What is the SBA size standard for NAICS 325991?
The SBA small business size standard for NAICS 325991 is 600 employees (based on employees).
What is the legacy SIC code mapping for 325991?
NAICS code 325991 maps to the legacy 1987 SIC codes: 3087 - Custom Compounding of Purchased Plastics Resins.