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PTFE expansion joint for chemical pipeline systems

teflon expansion joints with flanged ends

ptfe expansion bellows for flexible chemical pipeline use

teflon lined expansion joints for acid-resistant applications

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PTFE Expansion Joint

The PTFE Expansion Joint—also referred to as a PTFE-lined rubber joint, Teflon coated flexible connector, or fluoroplastic-lined expansion joint—is a premium solution designed to handle extremely corrosive and aggressive media in industrial piping systems.

This expansion joint consists of a high-quality rubber body (typically EPDM or NBR) internally lined with a seamless PTFE (polytetrafluoroethylene) layer, offering outstanding chemical resistance against strong acids, alkalis, chlorine compounds, solvents, and oxidants. The PTFE lining serves as a protective barrier, preventing chemical penetration and extending the product’s life cycle in harsh working environments.

To ensure structural strength and vibration isolation, the joint is reinforced with multiple layers of synthetic fabric cord and steel wire. The double-arch body design provides superior flexibility, allowing the joint to absorb axial, lateral, and angular movements caused by thermal expansion, mechanical misalignment, or equipment vibration.

This type of expansion joint is widely applied in:

•Chemical processing plants

•Pharmaceutical manufacturing

•Food-grade production lines

•Semiconductor fluid systems

•Desulfurization and wastewater treatment systems

Key Features

• PTFE Lining for Corrosion Resistance

Internally lined with virgin PTFE (Teflon®) to resist strong acids, alkalis, solvents, and other aggressive chemicals across a wide pH range (0–14).

•Rubber Flexibility with Chemical Protection

Combines the elasticity of EPDM or NBR rubber with the impermeability of PTFE, allowing excellent movement absorption and leak-proof sealing.

•Excellent Vibration and Noise Absorption

Reduces mechanical vibration and operational noise in piping systems, enhancing equipment longevity and operational safety.

•Multi-Directional Flexibility

Designed to absorb axial, lateral, and angular movements caused by thermal expansion, ground shifting, or misalignment.

•High Temperature and Pressure Tolerance

Suitable for demanding environments, operating up to 180°C and pressure ratings up to 16 bar depending on configuration.

•Reinforced Structure

Built with nylon fabric layers and optional steel wire reinforcement for added pressure resistance and durability.

•Universal Flange Compatibility

Available with ANSI, DIN, JIS, or custom flanges to meet international standards and ensure easy integration into existing systems.

•Customizable Options Available

Optional features include control rods, vacuum support rings, and different PTFE thicknesses tailored to your project needs.

Technical Specifications

Dimensions & Sizes

Nominal Diameter (DN)	Inch	Length (L) mm	Flange Thickness (b) mm	Bolt Qty (n)	Bolt Hole Dia. mm	Bolt Circle Dia. (D1) mm	Axial Extension mm	Lateral Displacement mm	Angular Deflection (°)
DN32	1.25”	95	16	4	18	100	6	9	9
DN40	1.5”	95	18	4	18	110	6	10	9
DN50	2”	105	18	4	18	125	7	10	10
DN65	2.5”	115	20	4	18	145	7	13	11
DN80	3”	135	20	4	18	160	8	15	12
DN100	4”	150	22	8	18	180	10	19	13
DN125	5”	165	24	8	18	210	12	19	13
DN150	6”	180	24	8	23	240	12	20	14
DN200	8”	210	24	8	23	295	16	25	22
DN250	10”	230	26	12	23	350	16	25	22
DN300	12”	245	28	12	23	400	16	25	22
DN350	14”	255	28	16	23	460	16	25	22
DN400	16”	255	30	16	25	515	16	25	22
DN450	18”	255	30	20	25	565	16	25	22
DN500	20”	255	32	20	25	620	16	25	22
DN600	24”	260	36	20	30	725	16	25	22
DN700	28”	260	36	24	30	840	16	25	22
DN800	32”	260	38	24	34	950	16	25	22
DN900	36”	260	42	28	34	1050	16	25	22
DN1000	40”	260	44	28	34	1160	18	26	24
DN1200	48”	260	48	32	41	1380	18	26	24
DN1400	56”	350	44	36	34	1560	20	28	26
DN1600	64”	350	46	40	34	1760	25	35	30
DN1800	72”	350	52	44	41	1970	25	35	30
DN2000	80”	420	54	48	48	2180	25	35	30
DN2200	88”	580	40	52	48	2390	25	35	30
DN2400	96”	610	41	56	48	2600	25	35	30
DN2600	104”	650	42	60	54	2810	25	35	30
DN2800	112”	680	45	64	54	3020	25	35	30
DN3000	120”	680	50	68	54	3220	25	35	30

Notes

Customization available upon request with specific drawings or specifications; flanges are based on the “National General Water Supply and Drainage Standard Atlas,” others follow HG/T2289-92.
For DN350-600(2) models, working pressure is 1.6MPa; for DN32-400(3) models, working pressure is 2.5MPa.
For DN700-DN200 models, working pressure is 1.0MPa; for DN1400, working pressure is 0.6MPa; for DN1600-DN1800, working pressure is 0.4MPa, flanges are selected according to 0.6MPa; for DN2000, working pressure is 0.25MPa, flanges are selected according to 0.6MPa pressure.
For high-rise water supply, products above DN200 must have fixed supports or brackets; otherwise, anti-pullout devices should be installed.

Technical Parameters

Project	Unit	JGD-1	JGD-2	JGD-3
Model	–	JGD-1	JGD-2	JGD-3
Working Pressure	MPa (kgf/cm²)	1.0 (10)	1.6 (16)	2.5 (25)
Burst Pressure	MPa (kgf/cm²)	2.0 (20)	3.0 (30)	4.5 (45)
Vacuum Resistance	KPa (mmHg)	53.3 (400)	86.7 (650)	100 (750)
Operating Temperature	°C	-15 ~ 115°C (Special: -30 ~ 250°C)	–	–
Applicable Media	–	Air, Compressed Air, Water, Seawater, Hot Water, Oil, Acid, Alkali, etc.

Rubber Materials

Material	Temperature Range (°C)	Oil Resistance	Acid & Alkali Resistance	Elasticity	Abrasion Resistance	Typical Applications

EPDM

-40 ~ 120

Poor

Excellent

Medium

Water, Steam, Air

NR (Natural Rubber)

-30 ~ 80

Poor

Medium

Excellent

Industrial Water, Air

NBR

-20 ~ 100

Excellent

Medium

Good

Oil, Lubrication Systems

Neoprene

-35 ~ 100

Good

Medium

Good

Seawater, Mild Chemicals

Silicone

-60 ~ 200

Poor

Good

Low

Food Grade, Medical

FKM (Viton)

-20 ~ 250

Excellent

Medium

Excellent

Chemical, High Temp Oil

Butyl (IIR)

-40 ~ 120

Poor

Good

Excellent

Medium

Gas, Acidic Gases

Installation Guide

1.Inspection Before Installation

•Check whether the rubber joint is damaged, aged, or defective.

•Confirm the model, pressure rating, and flange size match the system requirements.

2.Installation Environment

•Avoid installation under direct sunlight, ozone, or in environments with high temperature or strong corrosive chemicals.

•If outdoor installation is necessary, use UV-protective shields or covers.

3.Installation Instructions

•Align the rubber joint with the center of the pipe flanges. Avoid pulling or twisting during installation.

•Tighten bolts crosswise and evenly to avoid uneven force or deformation.

•Use proper washers and gaskets.

4.Precautions

•Ensure the pipeline is properly fixed; rubber joints are not designed to bear the full weight.

•Do not over-extend, over-compress, or apply excessive torsion to the joint.

•Allow for movement as specified (axial, lateral, angular) within rated limits.

•Install limit rods or anti-pull devices if the pipe system lacks sufficient fixation.

5.Working Pressure & Temperature

•Observe the rated pressure and temperature range during operation.

•Standard range: -15°C to +115°C (or as specified).

6.Routine Inspection & Maintenance

•Inspect every 6–12 months for signs of aging, damage, or leakage.

•Replace if any abnormalities are found.

Maintenance Guide

1. Inspection Before Installation

•Check whether the rubber joint is damaged, aged, or defective.

•Confirm the model, pressure rating, and flange size match the system requirements.

2.Installation Environment

•Avoid installation under direct sunlight, ozone, or in environments with high temperature or strong corrosive chemicals.

•If outdoor installation is necessary, use UV-protective shields or covers.

3.Installation Instructions

•Align the rubber joint with the center of the pipe flanges. Avoid pulling or twisting during installation.

•Tighten bolts crosswise and evenly to avoid uneven force or deformation.

•Use proper washers and gaskets.

4.Precautions

•Ensure the pipeline is properly fixed; rubber joints are not designed to bear the full weight.

•Do not over-extend, over-compress, or apply excessive torsion to the joint.

•Allow for movement as specified (axial, lateral, angular) within rated limits.

•Install limit rods or anti-pull devices if the pipe system lacks sufficient fixation.

5.Working Pressure & Temperature

•Observe the rated pressure and temperature range during operation.

•Standard range: -15°C to +115°C (or as specified).

6.Routine Inspection & Maintenance

•Inspect every 6–12 months for signs of aging, damage, or leakage.

•Replace if any abnormalities are found.

What is the purpose of a PTFE-lined expansion joint?

A PTFE-lined expansion joint is used to absorb thermal expansion, vibration, and movement in pipelines that transport highly corrosive or chemically aggressive media. The PTFE liner provides excellent resistance to acids, alkalis, and solvents, ensuring long-term durability and leak-proof performance.

What industries commonly use PTFE expansion joints?

PTFE expansion joints are widely used in chemical processing, pharmaceutical manufacturing, wastewater treatment, food-grade systems, and semiconductor fluid transport. They are ideal for environments that demand chemical resistance and hygienic performance.

What is the temperature and pressure rating of a PTFE expansion joint?

Typical PTFE-lined rubber joints can operate in temperatures ranging from -20°C to +180°C and withstand working pressures up to 16 bar, depending on the size and construction. Custom designs can be made for higher specifications.

Can PTFE expansion joints be customized?

Yes, we offer customization options including different flange standards (ANSI, DIN, JIS), control rods, vacuum rings, multi-arch bodies, and PTFE liner thickness to suit your specific application and operating conditions.

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