Introduction to PVDF Pipes
PVDF pipes are thermoplastic pipes made primarily from polyvinylidene fluoride (PVDF). They exhibit excellent chemical corrosion resistance, high-temperature resistance, and mechanical strength, making them representative products of high-performance engineering plastic pipelines.
Core Characteristics
| Characteristic |
Description |
Advantages |
| Excellent Chemical Resistance |
Resistant to most acids, alkalis, and organic solvents |
Suitable for conveying highly corrosive media |
| High Mechanical Strength |
Excellent tensile and compressive properties |
Can withstand high working pressures |
| Good Temperature Resistance |
Long-term service temperature: -40°C to 140°C |
Suitable for high-temperature media conveyance |
| High Purity |
Pure material, no leaching |
Meets requirements of semiconductor and pharmaceutical industries |
| UV Resistance |
Excellent anti-aging properties |
Suitable for outdoor use |
Main Types
| Type |
Characteristics |
Applications |
| Extruded Pipes |
Continuously extruded, flexible lengths |
General industrial pipeline systems |
| Injection Molded Fittings |
Injection molded, precise dimensions |
Pipe connectors, valves, and other fittings |
| Plastic-Lined Steel Pipes |
PVDF lining, steel outer shell |
High-pressure, impact-resistant applications |
Performance Parameters Table
| Performance Indicator |
Value Range |
Test Standard |
| Density (g/cm3) |
1.75-1.78 |
ASTM D792 |
| Tensile Strength (MPa) |
40-50 |
ASTM D638 |
| Flexural Strength (MPa) |
60-80 |
ASTM D790 |
| Heat Deflection Temperature (°C) |
140-150 |
ASTM D648 |
| Thermal Conductivity (W/m·K) |
0.15-0.20 |
ASTM C177 |
Application Fields
1. Chemical Industry:
· Acid and alkali conveyance pipelines
· Chemical storage and transport systems
· Corrosive media handling
2. Electronics Industry:
· Ultra-pure water conveyance systems
· Chemical distribution systems
· Semiconductor manufacturing equipment
3. Pharmaceutical Industry:
· Pharmaceutical process pipelines
· Purified water systems
· Biological product production
4. Environmental Engineering:
· Wastewater treatment systems
· Exhaust gas treatment equipment
· Pollution control facilities
Installation Requirements
1. Pipeline Connections:
· Hot melt welding (recommended)
· Flange connections
· Threaded connections (limited to small diameters)
2. Support Spacing:
· Below DN25: 1.0-1.5m
· DN25-DN50: 1.5-2.0m
· Above DN50: 2.0-2.5m
3. Thermal Compensation:
· Consider thermal expansion factors
· Install expansion joints or bend compensation
· Combine fixed supports with sliding supports
Selection Guide
1. Media Compatibility:
· Confirm chemical compatibility with conveyed media
· Consider temperature and concentration effects
· Refer to chemical compatibility charts
2. Pressure Rating:
· Select wall thickness based on working pressure
· Consider pressure fluctuation factors
· Reserve safety margin
3. Temperature Requirements:
· Determine long-term service temperature
· Consider temperature variation range
· Evaluate thermal expansion effects
Maintenance
1. Routine Inspection:
· Check pipeline appearance
· Monitor leakage situation
· Observe support conditions
2. Regular Maintenance:
· Clean inner pipe walls
· Inspect connection points
· Replace aging components
3. Storage Requirements:
· Avoid direct sunlight
· Keep away from heat sources
· Prevent mechanical damage
PVDF pipes, with their excellent chemical resistance, mechanical strength, and temperature resistance, are the preferred pipeline material for demanding working conditions. Although the cost is relatively high, their outstanding performance and long service life make them widely used in chemical, electronic, pharmaceutical, and other fields. Proper design, installation, and maintenance are key to ensuring the safe and reliable operation of PVDF pipeline systems.
