PVDF Coupler

A PVDF coupler is a pipe fitting made from polyvinylidene fluoride (PVDF), which is used to join the two pipes of the same diameter in a piping system. It provides a strong, leak-proof connection while maintaining excellent chemical resistance, thermal stability, and mechanical strength, which makes it suitable for corrosive, high-purity, and high-temperature applications. PVDF couplers are commonly used in chemical processing, pharmaceutical, semiconductor, oil & gas treatment, and industrial fluid handling systems, and are available with socket weld, butt weld, threaded, or flanged connections.

The PVDF coupler is one of the basic designs to fit and connect to the different pipe lengths or fittings together, often permanently. They are small parts that are permanently joined or “coupled” from one part to another. They can connect pipes to pipes as well as pipes to fittings. Some are even reduced in size, allowing you to connect a PVDF coupler to a smaller pipe to a larger pipe, or vice versa. PVDF Coupler is a high-quality product with slip or female-threaded ends, depending on your needs.

PVDF Coupler Details

d – Outer diameter of the pipe or the inner diameter of the socket
PN – Pressure Nominal
A – Socket depth
B – Total length of the coupler or socket fitting from end to end.
Z – Wall thickness

D	PN	A	B	Z
20	16	28	36	7
25	16	33	40	8
32	16	42	44	8
40	16	51	49	8
50	16	63	55	8
63	16	77	64	9
75	16	90	72	10
90	16	108	79	8
110	16	131	94	11

Parameter	Specification	Remarks
Material	Polyvinylidene Fluoride (PVDF)	Homopolymer / Copolymer grade
Product Type	Straight Coupler	Connects equal pipe sizes
Manufacturing Method	Injection molded / Fabricated	Based on size & standard
Connection Type	Socket weld / Butt weld / Threaded / Flanged	Fusion weld preferred
Nominal Size Range	½″ to 12″ (DN15 – DN300)	Larger sizes fabricated
Pressure Rating	Up to PN16 / 10 bar	Depends on size & temperature
Operating Temperature	−40°C to +140°C	Continuous service
Short-Term Temperature	Up to +150°C	Intermittent
Chemical Resistance	Excellent	Resistant to acids, alkalis, and solvents
Internal Surface	Smooth, non-porous	Low friction & contamination
Water Absorption	≤ 0.04%	ASTM D570
Density	1.75 – 1.78 g/cm³	ASTM D792
Flammability	UL 94 V-0	Self-extinguishing
UV Resistance	Excellent	Suitable for outdoor use
Standards Compliance	ASTM D3222, DIN 8077/8078, ISO 10931	As applicable
Colour	Natural (white) / Grey	High-purity grade in white
Applications	Chemical, Pharma, Semiconductor, Water Treatment	Corrosive & pure fluids
Joining Method	Heat fusion / Butt fusion	Leak-proof joint
Service Life	>25 years	Under normal operating conditions
Density	1.78–1.80 g/cm³	Lightweight yet strong material
Melting Point	170–175°C	Can handle moderate to high temperatures
Glass Transition Temp (Tg)	110°C	Temperature where material becomes soft
Tensile Strength	48–55 MPa	Good mechanical strength
Elongation at Break	20–50%	Shows flexibility before breaking
Flexural Strength	70–75 MPa	Resistance to bending stress
Impact Strength (Izod)	10–12 kJ/m²	Resistance to impact/shock
Hardness (Shore D)	80–85	Hard and durable surface
Thermal Conductivity	0.19–0.22 W/m·K	Low thermal conductivity (good insulator)
Coefficient of Thermal Expansion	1.2–1.5 × 10⁻⁴ /°C	Moderate expansion with temperature
Water Absorption	< 0.05%	Very low; maintains dimensional stability
Dielectric Constant	8.4 (1 kHz)	Excellent electrical insulation
Dielectric Strength	50–70 kV/mm	High resistance to electrical breakdown
Chemical Resistance	Excellent	Resists acids, bases, and solvents
UV Resistance	Excellent	Suitable for outdoor applications
Surface Finish	Smooth, low friction	Reduces fouling and maintenance

1. Thermal Stability

Operates effectively over a wide temperature range (typically -40°C to 150–170°C).
Suitable for hot and cold fluid applications without losing shape or performance.

2. Electrical Insulation

Excellent electrical insulating properties.
Can be used in systems where electrical safety is a concern.

3. Low Permeability

Minimal gas or liquid permeation.
Helps maintain fluid purity and prevents contamination.

4. UV and Weather Resistance

Resistant to ultraviolet (UV) light and harsh weather conditions.
Suitable for outdoor piping systems without degradation.

5. Corrosion and Fouling Resistance

Smooth surface reduces the adhesion of deposits or biofilms.
Low maintenance is required compared to metals that can corrode.

6. Versatility

Available in multiple designs: threaded, socket, flanged, reducing, straight, and quick-connect types.
Can be used in various industries: chemical, pharmaceutical, food, water treatment, and electronics.

7. Ease of Installation

Can be installed using threads, fusion welding, adhesives, or compression.
Suitable for both permanent and modular piping systems.

Nominal Pipe Size (DN / Inch)	PN10 (bar) @ 20°C	PN16 (bar) @ 20°C	PN20 (bar) @ 20°C	Notes / Applications
DN 15 / ½”	10	16	20	Common for lab and small pipelines
DN 20 / ¾”	10	16	20	General chemical handling
DN 25 / 1″	10	16	20	Standard small to medium pipelines
DN 32 / 1¼”	10	16	20	Moderate flow systems
DN 40 / 1½”	10	16	20	Industrial fluid transport
DN 50 / 2″	10	16	20	Often used for pumps or tanks
DN 65 / 2½”	10	16	20	Medium industrial lines
DN 80 / 3″	10	16	20	Larger pipelines
DN 100 / 4″	10	16	20	High-volume fluid systems
DN 125 / 5″	10	16	20	Large-scale chemical piping

Benefits of Using PVDF Coupler

1. Chemical Resistance

PVDF is highly resistant to a wide range of acids, bases, and solvents.
PVDF couplers are ideal for environments involving aggressive chemicals or corrosive fluids.
They maintain structural integrity in chemical processing industries, oil & gas treatment, and laboratories.

2. Mechanical Strength

PVDF couplers exhibit good tensile strength and toughness.
They can handle mechanical stresses, vibrations, and slight misalignments without cracking.
Suitable for fluid transport systems that require durability.

3. Thermal Stability

PVDF can withstand continuous temperatures up to 150–170°C and short-term peaks higher.
Maintains performance under varying temperature conditions, unlike some other plastics that deform or weaken.

4. Electrical Insulation

PVDF is an excellent insulator, making PVDF couplers useful in electronic and electrical applications.
Reduces risk of short circuits, static buildup, or electrical interference.

5. Low Permeability

PVDF has low permeability to gases and liquids.
Helps maintain fluid purity and prevents contamination in pipelines or processing systems.

6. Lightweight

Being a polymer, PVDF couplers are significantly lighter than metal equivalents.
Easier to install and handle, reducing labor costs and mechanical load on piping systems.

7. Resistance to UV and Weathering

PVDF is resistant to ultraviolet (UV) light, making it suitable for outdoor applications.
Maintains color and mechanical properties even in harsh environmental conditions.

8. Flexibility in Design

Can be molded into various shapes and sizes with tight tolerances.
Ideal for custom coupler designs where precise fit and alignment are necessary.

9. Low Maintenance

Non-stick surface and chemical resistance reduce the buildup of residues.
Minimal maintenance is required compared to metal couplers which can corrode.

Types of PVDF Coupler

1. Based on Connection Type

a) Threaded PVDF Couplers

Feature internal or external threads for screw-type connections.
Common in piping systems where frequent assembly and disassembly are needed.
Easy to install without welding or adhesives.

b) Socket (Slip) PVDF Couplers

Designed for fusion welding or solvent cement bonding.
Pipes are inserted into the coupler, then joined permanently using heat or adhesive.
Provides a leak-proof, strong connection.
Applications: Permanent piping in chemical plants or water treatment systems.

c) Flanged PVDF Couplers

Equipped with flanges for bolted connections to other pipes, valves, or equipment.
Ideal for high-pressure or larger diameter pipelines.
Allows easy disassembly for maintenance.
Applications: Industrial fluid systems, corrosive chemical transport.

2. Based on Function

a) Straight Couplers

Connect two pipes of the same diameter in a straight line.
Most common type.

b) Reducing Couplers (Reducer)

Connect pipes of different diameters.
Maintain fluid flow while transitioning between pipe sizes.

c) Elbow or Angled Couplers

Connect pipes at a specific angle (e.g., 45°, 90°).
Not a traditional “coupler” but often included as a PVDF joint accessory.

d) Tee and Cross Couplers

Connect three or four pipes at junctions.
Facilitate splitting or merging of fluid flow.

3. Specialized PVDF Couplers

a) Compression Couplers

Use mechanical compression to seal pipes together.
Useful when welding or adhesives aren’t feasible.

b) Quick-Connect Couplers

Snap-fit design for rapid assembly and disassembly.
Often used in portable systems or lab setups.

Why Choose Petron Thermoplast?

Petron Thermoplast, it is because of our unwavering commitment to the PVDF coupler industry, our emphasis on product diversity, the importance we place on product quality, and our dedication to green environmental practices and sustainable development that our brand has gradually gained recognition. Our products have earned the trust and praise of numerous customers, and our brand has become a symbol of reliability and trustworthiness.

Our brand story is one of continuous progress and innovation. We will continue to create more value for more customers and contribute to the development of the industry. We believe that through sustained efforts and adherence to our principles, our brand will continue to shine brightly and make a mark internationally.