PVC-O International Standards

The ISO 16422 series defines the international standard for molecularly oriented PVC (PVC-O) pipes, fittings, and system fitness for purpose. These standards specify requirements for dimensions, material classification, pressure ratings, impact resistance, and test methods — forming the foundational technical framework for PVC-O pipe manufacturing, procurement, and quality acceptance worldwide.

The ISO 16422 Standard Series

• PVC-O General Provisions — ISO 16422-1:2024 General requirements, terminology, and material classification PDF →
• PVC-O Pipes — ISO 16422-2:2024 Dimensions, performance, and test methods for pipes PDF →
• PVC-O Fittings — ISO 16422-3:2023 Specifications for fittings and joint systems PDF →
• PVC-O System Fitness for Purpose — ISO 16422-5:2024 System-level suitability and operational performance PDF →

What ISO 16422 Covers

The ISO 16422 standard series was developed to provide a unified international framework for PVC-O (molecularly oriented poly(vinyl chloride)) pipe systems. Key aspects covered by the series include:

• Material classification — Defines MRS (Minimum Required Strength) classes such as PVC-O 400, PVC-O 450, and PVC-O 500, ensuring consistent material grading across manufacturers.
• Dimensional specifications — Specifies outside diameters, wall thicknesses, and tolerance bands for each DN (nominal diameter) and PN (nominal pressure) combination.
• Pressure ratings — Establishes the relationship between pipe class, SDR (Standard Dimension Ratio), and sustained pressure performance at 20°C and 60°C.
• Mechanical performance — Sets requirements for tensile strength, impact resistance, and ductile failure mode — the defining characteristics of molecularly oriented PVC.
• Test methods — Standardizes procedures for hydrostatic testing, impact testing, dimension measurement, and long-term regression analysis.
• System fitness for purpose — Part 5 addresses the complete pipe system (pipes + fittings + joints) under realistic operational conditions, including leak-tightness and end-load resistance.

All four ISO 16422 parts open in a new tab and are hosted on Google Drive for direct download. If you require engineering consultation on applying these standards to your specific project, please contact our technical team.