Didn't need any government workers to write the warning in this manufacturer's brochure:
Technical & Installation Data for PVC & CPVC Pipe and Fittings

"PVC AND CPVC PIPING PRODUCTS ARE NOT RECOMMENDED FOR SYSTEMS WHICH TRANSPORT OR STORE COMPRESSED AIR OR GASES. DO NOT TEST PVC OR CPVC PIPING SYSTEMS WITH COMPRESSED AIR OR GASES. ALWAYS BLEED ALL ENTRAPPED AIR FROM THE SYSTEM PRIOR TO TESTING."

This document is a little old .

However, these people reported no short-term problems below 100psi.