PVDF Union
A PVDF union is a detachable pipe fitting made from polyvinylidene fluoride (PVDF) that allows two sections of piping to be easily connected and disconnected without cutting the pipe. They have a ring in the middle that divides the two ends, making dismantling and maintenance simple. These PVDF unions and pipes are abrasion-resistant, have high mechanical strength, are tough, durable, and can survive harsh weather conditions.
PVDF union connectors are pipe fittings that allow two PVDF pipes to be joined without using sealants or conventional bonded couplings. We provide the best thermoplastic material-based products for the customers. PVDF Union is a very simple-to-use, connect piping installation system. PVDF (Polyvinylidene Fluoride) is a high-performance thermoplastic known for Excellent chemical resistance, High temperature tolerance, and UV and corrosion resistance.
- Chemical Resistance
- Low Maintenance Requirement
- Low Thermal Conductivity
- Long Service Life
- Easy Installation
- Corrosion Resistance
PVDF Union Details
- d – Pipe Outer Diameter (OD)
- R1 – Thread Size (typically BSP or NPT)
- PN – Pressure Nominal (rated pressure in bar, e.g., PN16)
- E – Socket Depth or Thread Length
- H – Overall Height of the Union
- Z1 – Insertion Depth (side 1)
- Z2 – Insertion Depth (side 2)
- g – Weight (in grams)
| d | R | PN | E | H | Z1 | Z2 | g |
| 20 | 1” | 16 | 47 | 45.5 | 12 | 5.5 | 59 |
| 25 | 1” 1/4 | 16 | 58 | 49.5 | 12 | 5.5 | 99 |
| 32 | 1” 1/2 | 16 | 65 | 53.5 | 12 | 5.5 | 141 |
| 40 | 2” | 16 | 78 | 59.5 | 14 | 5.5 | 218 |
| 50 | 2” 1/4 | 16 | 85 | 67.5 | 16 | 5.5 | 290 |
| 63 | 2” 3/4 | 16 | 103 | 79.5 | 20 | 5.5 | 476 |
| Parameter | Details |
| Product Type | Union (Detachable pipe fitting) |
| Material | Polyvinylidene Fluoride (PVDF) |
| Construction | Three-piece design (body + union nut + seal/O-ring) |
| Manufacturing Method | Injection moulded / machined |
| Connection Type | Socket weld / Threaded (BSP, NPT, PT) |
| Available Sizes | DN15 to DN100 (½″ to 4″) |
| Pressure Rating | PN10 to PN16 (10–16 bar) |
| Working Pressure (Typical) | Up to ~230 PSI at 23°C |
| Operating Temperature | -20°C to +120°C (up to ~140°C max) |
| Temperature Range (Alt.) | -40°C to +100°C (depending on grade) |
| Density (Specific Gravity) | ~1.75 – 1.78 g/cm³ |
| Tensile Strength | ~35 – 50 MPa |
| Elongation at Break | ~20 – 50% |
| Flexural Strength | ~80 MPa (typical PVDF) |
| Modulus of Elasticity | ~1000 – 2000 MPa |
| Thermal Conductivity | ~0.19 – 0.20 W/m·K |
| Coefficient of Expansion | ~1.2 – 1.4 × 10⁻⁴ /K |
| Seal Material Options | EPDM / FPM (Viton®) / PTFE |
| Chemical Resistance | Excellent (acids, bases, solvents) |
| Surface Finish | Smooth internal bore (low friction, no scaling) |
| Color | Natural white / translucent |
| UV Resistance | Excellent (outdoor suitability) |
| Standards Compliance | ASTM D3222, DIN 8077/8078, ISO 10931 |
| Design Feature | Easily detachable without pipe cutting |
| Applications | Chemical processing, pharma, water treatment, semiconductor |
1. Strong Mechanical Properties
- High tensile strength
- Good impact resistance
- Durable under pressure
2. Corrosion & UV Resistance
- Does not rust or corrode
- Excellent resistance to UV radiation (suitable for outdoor use)
3. Smooth Internal Surface
- Low friction loss
- Reduced scaling and buildup
- Improved flow efficiency
4. Leak-Proof Sealing
- Usually includes EPDM, FKM (Viton), or PTFE seals
- Ensures a tight, reliable connection
5. Easy Installation & Maintenance
- Allows quick disconnection of pipeline sections
- No need to cut or damage pipe during maintenance
6. Lightweight
- Much lighter than metal unions
- Easier handling and installation
7. High Purity Option
- Suitable for pharmaceutical, semiconductor, and food-grade applications (when specified)
| Temperature (°C) | Max Working Pressure (bar) | Max Working Pressure (psi) |
| 20°C | 16 bar | 232 psi |
| 30°C | 14 bar | 203 psi |
| 40°C | 12 bar | 174 psi |
| 60°C | 10 bar | 145 psi |
| 80°C | 6 bar | 87 psi |
| 100°C | 4 bar | 58 psi |
| 120°C | 2–3 bar | 29–44 psi |
| 140°C (max) | 1–2 bar | 15–29 psi |
2️. Pressure Rating by Nominal Size (at 20°C)
| Nominal Size | Pressure Rating (bar) | Pressure Class |
| ½” – 2″ (DN15–DN50) | 16 bar | PN16 |
| 2½” – 3″ (DN65–DN80) | 10–12 bar | PN10 / PN12 |
| 4″ (DN100) | 10 bar | PN10 |
Custom Product Manufacturing Available
If you are searching for customized product designs that meet your requirements, don’t worry. Petron Thermoplast also offers custom product manufacturing services to meet the unique needs of various industries. Work with our expert engineers to create custom designs suited for your application.
Benefits of Using PVDF Union
1. Excellent Chemical Resistance
- Highly resistant to acids, alkalis, solvents, and corrosive chemicals
- Ideal for aggressive chemical environments
2️. High Temperature Resistance
- Can operate continuously up to 140°C (depending on pressure)
- Maintains mechanical strength at elevated temperatures
3️. Corrosion-Free Material
- Does not rust or corrode like metal fittings
- Long service life in harsh environments
4️. Easy Installation & Maintenance
- 3-piece union design allows quick disconnection
- No need to cut the pipe during maintenance
- Reduces downtime
5️. High Mechanical Strength
- Strong and impact-resistant
- Handles moderate to high-pressure systems
6️. Smooth Internal Surface
- Low friction loss
- Reduces scaling and buildup
- Improves flow efficiency
7️. UV & Weather Resistant
- Suitable for outdoor applications
- Maintains performance under sunlight exposure
8️. High Purity & Clean Applications
- Low leaching properties
- Suitable for the pharmaceutical and semiconductor industries
9️. Lightweight
- Easier handling compared to metal unions
- Lower installation cost
Types of PVDF Union
1. Socket (Solvent Weld) PVDF Union
- Connected by socket welding (heat fusion)
- Strong, leak-proof joint
- Common in chemical and water treatment systems
- Suitable for permanent installations
2️. Threaded PVDF Union
- Available in BSP or NPT threads
- Easy to install and remove
- Used in small-diameter piping systems
- Suitable for moderate pressure applications
3️. Flanged PVDF Union
- Connected using flanges and bolts
- Used in larger pipe sizes
- Suitable for high-pressure industrial systems
- Easy maintenance and replacement
4️. True Union PVDF
- Three-piece design (two ends + central nut)
- Most common type
- Allows easy dismantling without disturbing the pipeline
- Available in socket and threaded ends
5️. O-Ring Sealed PVDF Union
- Uses EPDM, FKM (Viton), or PTFE seals
- Provides excellent leak protection
- Suitable for chemical handling systems
Applications of PVDF Union
Process Industry
High Purity Applications
Electronic Industry
Electrical Industry
Semi-conductors Industry
Pharmaceutical Industry
Solar power panels
Sugar Industry
Paper & Pulp Industry
Nuclear Power Industry
Automotive Industry
DI water plants
Why Choose Petron Thermoplast?
At Petron Thermoplast, the PVDF Union is an important industrial component for unidirectional flow in fluid systems by preventing backflow. These function are accurately, responding to pressure variations. This makes them indispensable in applications requiring continuous flow without active control.
