2022 NAICS national industry in sector 31-33 Manufacturing
325991 Custom Compounding of Purchased Resins
NAICS 325991 is the US industry code for custom compounding of purchased resins. This U.S.
- Code
- 325991 (2022 NAICS)
- Title
- Custom Compounding of Purchased Resins
- Part of
- All Other Chemical Product and Preparation Manufacturing
- SBA small business limit
- Up to 600 employees
- Closest UK SIC
- 20130 (details)
Changes coming. The NAICS 2027 revision applies to data from 1 January 2027, and SBA proposed new size standards on 20 August 2026. The values on this page are the ones in force today; we update this page when the official files change.
Official definition
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.
When to use a different code
Census classifies these close-sounding activities somewhere else. Businesses mainly engaged in:
- 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.
Activities listed under 325991
The Census index assigns these 4 activities to this code. If your business matches one, this is your code.
- Custom compounding (i.e., blending and mixing) of purchased plastics resins
- Plastics resins compounding from recycled materials
- Plastics resins, custom compounding of purchased
- Reformulating plastics resins from recycled plastics products
SBA size standard for 325991
To count as a small business for SBA loans and federal contracts under NAICS 325991, your business (including affiliates) must not exceed 600 employees. Check your business.
Source: SBA table of size standards, effective March 17, 2023.
Closest UK SIC 2007 codes
There is no official one-to-one link between NAICS and UK SIC. These codes share the same international class (ISIC Rev. 4: 2013), so treat them as a starting point and check the definition.
Built from Census concordances 2022→2017 NAICS and 2017 NAICS→ISIC Rev. 4.
Similar codes to compare
Data last changed November 14, 2026. How this page is built.