Isostatic Pressed Flared PTFE Lined Pipes

Overview

Anhui Xinfulong's Isostatic Pressed Flared PTFE Lined Pipes are precision-engineered for the most demanding chemical processing, semiconductor, and high-purity fluid handling applications. Manufactured in accordance with HG/T 4584-2014, the industry standard for isostatic pressed PTFE lined piping systems, our pipes combine the exceptional chemical resistance of PTFE with the superior mechanical strength and dimensional stability achieved through advanced isostatic pressing technology.

The manufacturing process begins with high-purity PTFE powder being isostatically pressed under pressures up to 30MPa in a closed isostatic autoclave. The PTFE tube blank is then sintered according to a precisely controlled temperature curve in a computer-controlled furnace. Following sintering, the PTFE liner is heated, pulled into the steel housing, and the ends are flared to create a secure, leak-tight seal. The flared ends are then locked into the steel flange assembly, creating a fully integrated, vacuum-rated piping system.

The Isostatic Pressing & Flaring Process

Isostatic Pressing is a forming method where PTFE powder is placed in a flexible mold within a high-pressure vessel. Liquid medium is injected and pressurized up to 30MPa. According to Pascal‘s principle, pressure is transmitted uniformly and equally in all directions, compressing the PTFE powder into a dense, voidless tube blank with homogeneous properties.

Key advantages of isostatic pressing:

• Higher forming pressure produces significantly higher PTFE density compared to conventional molding methods

• Superior permeation resistance due to the dense, voidless structure

• Exceptionally uniform wall thickness — eliminating weak points and the risk of cracking under pressure

• Meets or exceeds ASTM F1545 inspection standards — the highest standard for fluoropolymer lined piping

The Flaring Process:

• Following sintering, the PTFE tube is heated and pulled into the steel housing

• The ends are precision-flanged through a sequence of section trimming, heating, pressurization, flaring, cooling, and shaping

• The flared ends are securely locked into the steel flange assembly, creating a fully integrated, leak-tight seal

• This “relaxation installation” method accommodates differential thermal expansion between the PTFE liner and steel housing, preventing liner buckling and cracked flares under thermal cycling

Key Features

Superior Density & Permeation Resistance

• Isostatic pressing at up to 30MPa achieves maximum PTFE density, significantly reducing permeation rates

• Dense, voidless structure prevents fluid penetration and contamination

• Ideal for handling hazardous, toxic, and high-purity chemicals

Exceptional Chemical Resistance

• Inert to virtually all chemicals — acids, alkalis, organic solvents, strong oxidants, and aggressive etchants-

• Withstands the most corrosive media including concentrated hydrochloric acid, sulfuric acid, nitric acid, and hydrofluoric acid-

• Suitable for the full pH range

Wide Temperature & Pressure Range

• Design temperature: –80°C to +250°C

• Design pressure: –0.1MPa to 2.5MPa (full vacuum to 362 psi)

• Full vacuum rated — flared end design prevents liner collapse under vacuum conditions

Uniform Wall Thickness & Dimensional Stability

• Isostatic pressing ensures exceptionally uniform wall thickness throughout the entire pipe length

• Eliminates low-pressure resistance and cracking risks caused by wall thickness deviation

• Tight dimensional tolerances ensure reliable flange connections

Flared End Design

• Secure, leak-tight seal between PTFE liner and steel flange

• Accommodates differential thermal expansion between PTFE and steel

• Prevents liner buckling and cracked flares under thermal cycling

• Easy installation and maintenance

Smooth, Non-Stick Surface

• Extremely smooth internal surface minimizes pressure drop and flow resistance

• Anti-adhesive properties prevent scaling and buildup

• Easy to clean — ideal for high-purity and pharmaceutical applications

Long Service Life

• High creep resistance and dimensional stability under load

• Excellent resistance to thermal shock and mechanical stress

• Minimal maintenance requirements over extended service life

Technical Specifications

Applications

Our Isostatic Pressed Flared PTFE Lined Pipes are widely deployed in:

Semiconductor Manufacturing

• High-purity chemical delivery lines for wet etching and wafer cleaning

• Ultra-pure water (UPW) distribution systems

• CMP slurry and chemical mechanical planarization lines

Wet Electronic Chemicals

• Transfer lines for high-purity acids, solvents, and etchants

• Chemical blending and distribution systems

• High-purity reagent feed lines

Chemical Processing

• Corrosive chemical transfer in pickling, plating, and etching processes

• Acid recovery and waste treatment systems

• Chlor-alkali and specialty chemical production

Pharmaceutical & Biotech

• High-purity fluid transfer with zero contamination risk

• Solvent and reagent delivery systems

• GMP-compliant processing lines

New Energy

• Battery chemical processing and electrolyte handling

• Photovoltaic wet processing lines

Fluorochemical & Petrochemical

• Handling of aggressive fluorinated compounds

• High-temperature acid and alkali transfer

Why Choose Xinfulong Isostatic Pressed Flared PTFE Lined Pipes?

• Superior Quality — Isostatic pressing at up to 30MPa achieves the highest PTFE density and uniformity, delivering superior permeation resistance and mechanical strength

• Industry Standard Compliance — Manufactured in full compliance with HG/T 4584-2014 and meeting or exceeding ASTM F1545 inspection standards

• Vacuum Rated — The flared end design with relaxation installation ensures full vacuum rating, preventing liner collapse under vacuum conditions

• Proven Performance — High density, high temperature resistance, negative pressure resistance, permeation resistance, tensile strength, and extended service life

• Cleanroom Manufacturing — Critical production processes carried out in Class 1000/10,000 cleanrooms, ensuring the highest levels of purity

• Industry-Leading Expertise — Backed by decades of fluoropolymer processing experience and R&D collaboration with Japanese and Korean experts

• Comprehensive Quality Assurance — ISO 9001, ISO 14001, ISO 45001 certified with full in-house testing capabilities including dimensional inspection, hydrostatic pressure testing, and vacuum testing

• End-to-End Service — From custom design and material selection to manufacturing, testing, and after-sales support

Customization Options

We offer fully customizable isostatic pressed flared PTFE lined pipes to meet your specific requirements:

• Custom diameters (DN15 to DN600 and larger)-

• Custom lengths and spool configurations-

• Carbon steel, stainless steel (304/316L), or custom alloy housings

• Loose flanges, fixed flanges, or custom flange configurations

• Special end connections and fittings

• Custom pressure and temperature ratings

• Integration with complete piping systems including fittings, valves, and accessories