---
kind: "unit"
title: "39"
title_heading: "Postal Service"
key: "ptIV/ch36/schIII"
level: "subchapter"
label: "Subchapter III"
heading: "Provisions Relating to Experimental and New Products"
release: "119-102"
date: "2026-07-12"
url: "https://uscodex.org/usc/39/ptIV-ch36-schIII"
sections_count: 2
---

# Subchapter III — Provisions Relating to Experimental and New Products

Title 39 — Postal Service › Part IV — Mail Matter › Chapter 36 — Postal Rates, Classes, and Services

## Sections

- [§3641. Market tests of experimental products](/usc/39/3641.md)
- [§3642. New products and transfers of products between the market-dominant and competitive categories of mail](/usc/39/3642.md)