PSC R428: Support – Professional: Industrial Hygienics
R428 is the product and service code (PSC) federal agencies use for support – professional: industrial hygienics, in the professional services group. Here are the contracts open under it now, the NAICS codes it pairs with, and who buys and wins this work.
- Open contracts now
- 0
Open count as of Oct 11, 2026, 7:09 PM ET.
Where R428 sits in the PSC Manual
- Category: Service
- Group R: Support SVCS (Prof, Admin, MGMT)
- Group R4: Professional Services
- Code R428: Support – Professional: Industrial Hygienics
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Related PSC codes
- R401 Support – Professional: Personal Care (Non-Medical)
- R402 Support – Professional: Real Estate Brokerage
- R403 Real Estate Brokerage Services
- R404 Support – Professional: Land Surveys – Cadastral (Non-Construction)
- R405 Support – Professional: Operations Research/Quantitative Analysis
- R406 Support – Professional: Policy Review/Development
- R407 Program Evaluation Services
- R408 Support – Professional: Program Management/Support
- R409 Program Review/Development Services
- R410 Support – Professional: Program Evaluation/Review/Development
Frequently asked questions
What is PSC R428?
R428 is the service code in the federal Product and Service Code (PSC) Manual for support – professional: industrial hygienics, under R (Support SVCS (Prof, Admin, MGMT)) and R4 (Professional Services). Agencies put a PSC on every contract to record what they bought.
What is the difference between a PSC and a NAICS code?
A PSC describes what the government is buying. A NAICS code describes the industry of the business doing the work, and it sets the SBA size standard for small business set-asides. Every contract notice has both.
How do I find contracts that use PSC R428?
Contract opportunities are posted on SAM.gov with their PSC and NAICS codes. FedReady can match new ones to your business and email you, free.