GB/T 48044.3-2026Perfluoro(alkyl vinyl ether)-tetrafluoroethylene plastic (PFA) piping systems for industrial applications — Part 3: Fittings (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents".

This document is Part 3 of GB/T 48044 "Perfluoro(alkyl vinyl ether)-tetrafluoroethylene (PFA) piping systems for industrial use".

GB/T 48044 has published the following parts.

---Part 1: General Provisions;

---Part 2: Pipes;

---Part 3: Pipe Fittings;

---Part 4: Valves.

Introduction

GB/T 48044, "Industrial Perfluoro(Alkyl Vinyl Ether)-Tetrafluoroethylene (PFA) Piping Systems," is a standard guiding my country's standards for perfluoro(alkyl vinyl ether)-tetrafluoroethylene plastic (PFA) piping systems.

GB/T 48044 is a standard for the production and application of vinyl ether (VIE)-tetrafluoroethylene (PFA) plastic pipe products. It aims to regulate the use of PFA in the photovoltaic and electronics industries.

Materials, pipes, fittings, and valves for perfluoro(alkyl vinyl ether)-tetrafluoroethylene (PFA) piping systems used for transporting ultrapure water or chemical media.

The assessment of door and system suitability and conformity is proposed to consist of six parts.

---Part 1: General Provisions. The purpose is to establish the applicable principles for industrial perfluoro(alkyl vinyl ether)-tetrafluoroethylene (PFA) pipes. System material requirements and testing methods.

---Part 2: Piping. The purpose is to establish suitable perfluoro(alkyl vinyl ether)-tetrafluoroethylene (PFA) pipes for industrial use. Requirements, test methods, inspection rules, marking, packaging, transportation, and storage.

---Part 3: Fittings. The purpose is to establish suitable perfluoro(alkyl vinyl ether)-tetrafluoroethylene (PFA) pipe fittings for industrial use.

Product classification, design, requirements, test methods, inspection rules, marking, packaging, transportation, and storage.

---Part 4: Valves. The purpose is to establish suitable industrial perfluoro(alkyl vinyl ether)-tetrafluoroethylene (PFA) valves.

Product classification, design, requirements, test methods, inspection rules, marking, packaging, transportation, and storage.

---Part 5: System Suitability. The aim is to establish suitability for industrial perfluoro(alkyl vinyl ether)-tetrafluoroethylene plastics.

---Part 7: Conformity Assessment Guidelines. The aim is to establish guidelines applicable to industrial perfluoro(alkyl vinyl ether)-tetrafluoroethylene plastics.

(PFA) Conformity assessment test items and test methods for piping systems.

1 Scope

This document specifies the industrial-grade perfluoro(alkyl vinyl ether)-tetrafluoroethylene (PFA) (also known as melt-processable polytetrafluoroethylene) tubing.

The materials, product classification, design, requirements, system suitability, inspection rules, marking, packaging, transportation, and storage of fittings (hereinafter referred to as "fittings") are described. The corresponding experimental methods are described.

This document applies to perfluoro(alkyl vinyl ether)-tetrafluoroethylene plastics used in the photovoltaic, electronics, and other industries for the transport of ultrapure water or chemical media. (PFA) Piping System.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies to this document.

GB/T 602 Preparation of standard solutions for the determination of impurities in chemical reagents

GB/T 2828.1 Sampling Procedures for Inspection by Attributes - Part 1: Sampling Schemes Retrieved by Acceptable Quality Limit (AQL) for Lot-by-Lot Inspection

GB/T 2918 Standard Environment for Conditioning and Testing of Plastic Specimens

GB/T 5750.6 Standard Examination Methods for Drinking Water - Part 6: Metals and Metalloids

GB/T 6111 Determination of internal pressure resistance of thermoplastic piping systems for fluid transport

GB/T 10610 Product Geometric Specification (GPS) - Rules and methods for evaluating surface structure using the surface structure profile method

GB/T 11446.1 Electronic Grade Water

GB/T 11446.7 Ion chromatography method for the determination of trace anions in electronic grade water

GB/T 11446.8 Test method for total organic carbon in electronic-grade water

GB/T 19278 General Terminology and Definitions for Thermoplastic Pipes, Fittings and Valves

GB/T 20666 Unified Thread Tolerances

GB/T 20669 Unified Thread Profile

GB/T 20670 Unified Series of Thread Diameters and Number of Teeth

GB/T 37837-2019 General Rules for Quadrupole Inductively Coupled Plasma Mass Spectrometry

GB/T 48044.1-2026 Industrial Perfluoro(alkyl vinyl ether)-Tetrafluoroethylene (PFA) Piping Systems - Part 1: General Principles

GB/T 48044.2-2026 Industrial Perfluoro(alkyl vinyl ether)-tetrafluoroethylene (PFA) Piping Systems - Part 2: Pipes

GB/T 48044.4-2026 Industrial Perfluoro(alkyl vinyl ether)-Tetrafluoroethylene (PFA) Piping Systems - Part 4. valve

3 Terms and definitions, symbols and abbreviations

The terms and definitions, symbols and abbreviations defined in GB/T 19278 apply to this document.