Chemical plants are harsh environments – strong acids, hot alkalis, corrosive solvents, high temperatures, and sticky residues. Equipment must resist attack, stay clean, and operate reliably.
PTFE high-temperature fabric (PTFE-coated fiberglass) is uniquely suited to these challenges. It combines chemical inertness, wide temperature range (-70°C to 260°C), non-stick surface, and dimensional stability.
Aokai PTFE has supplied PTFE fabric to chemical plants for decades. Below are seven key applications where PTFE fabric outperforms traditional materials.
Sealing and Pipeline Lining – Gaskets and Inner Liners
Pipes, valves, and pumps in chemical service must withstand corrosive fluids. PTFE fabric provides two solutions.
1. Flange and valve gaskets
PTFE fabric is cut into gaskets for pipe flanges, valve bonnets, and pump joints. Unlike rubber gaskets that swell or degrade in solvents, PTFE remains inert. It seals against strong acids (sulfuric, nitric, hydrochloric), strong alkalis (sodium hydroxide), and organic solvents (toluene, acetone, MEK).
2. Pipeline and reactor linings
PTFE fabric can be bonded to the inner walls of carbon steel or FRP pipes, serving as a corrosion-resistant lining. It also reduces friction and prevents material buildup on pipe walls – critical for handling viscous or sticky chemicals.
Anti-Corrosion Lining for Equipment – Reactors, Tanks, Centrifuges
Chemical reactors, agitators, storage tanks, and centrifuges are often made of carbon steel or stainless steel. Direct contact with corrosive chemicals leads to pitting, cracking, and contamination of products.
1. Protective isolation layer
PTFE fabric is applied as a lining to the inner walls of these vessels. It acts as a barrier between the metal substrate and the chemical medium, preventing corrosion and extending equipment life by years.
2. Non-stick benefit for material discharge
The non-stick surface prevents viscous materials (e.g., resins, adhesives, slurries) from clinging to tank walls. This improves discharge efficiency and reduces cleaning time between batches.
3. Metal-ion sensitive applications
In semiconductor chemical production or fine chemicals where trace metal contamination is unacceptable, PTFE lining prevents metal ions from leaching into high-purity chemicals.
Filtration Materials – High-Temperature, Corrosive Gas & Liquid
Chemical plants generate hot, corrosive exhaust gases and need to filter both gases and liquids.
1. Filter bags for high-temperature flue gas
PTFE fabric (often with a PTFE membrane laminate) is made into filter bags for baghouse dust collectors. These bags handle:
Continuous temperature up to 260°C
Highly corrosive gases (HCl, SOₓ, HF, dioxins)
Sticky dust (carbon black, resin powder)
PTFE’s non-stick surface prevents dust caking, allowing pulse-jet cleaning to restore low pressure drop. Emissions as low as <1 mg/Nm³ are achievable.
2. Filter press cloth for viscous materials
For liquid-solid separation, PTFE fabric serves as filter cloth on plate-and-frame filter presses. The filter cake releases cleanly, and the cloth is easy to wash – reducing downtime and labor.
Anti-Corrosion Flexible Joints – Expansion Joints for Ducts
Ventilation ducts and flues in chemical plants experience thermal expansion, vibration, and misalignment. They also carry corrosive gases.
1. Non-metallic expansion joints
PTFE fabric is used as the flexible element in expansion joints between duct sections. It compensates for pipeline movement while resisting attack from acid fumes and high temperatures. Unlike rubber bellows, PTFE does not degrade in UV or ozone.
Anti-Adhesion Isolation Materials – Welding Pads and Release Liners
During equipment manufacturing and maintenance, PTFE fabric protects against unwanted adhesion.
1. Welding splash pads
When welding near sensitive equipment or finished surfaces, PTFE fabric is placed as a splash-proof pad. Weld spatter does not stick to PTFE – it simply bounces off or can be wiped away. This prevents costly cleanup and damage.
2. Release cloth for high-temperature curing
In the production of resins, rubber, and composites that require high-temperature curing (e.g., epoxy, phenolic, silicone rubber), PTFE fabric is used as a release liner or conveyor belt. The cured material releases cleanly without sticking to the belt or mold.
Release Cloth for Composite Molding
Fiberglass reinforced plastics (FRP), rubber products, and other composites are molded under heat and pressure. Without a release layer, the finished part bonds to the mold.
1. Demolding and surface texture
PTFE fabric is placed between the mold and the composite layup. It ensures easy demolding after curing and can impart a uniform, smooth or textured surface finish depending on the fabric weave. PTFE fabric is reusable for many cycles, replacing single-use release films.
Electrical and Thermal Insulation – Wraps for Electrodes and Pipes
Chemical workshops contain electrical components and hot surfaces that need protection.
1. Electrical insulation for electrodes and heaters
PTFE fabric has excellent dielectric properties (dielectric constant <2.6, high volume resistivity). It is used as wrapping insulation for electrodes, bus bars, and electric heating elements in corrosive environments where ordinary PVC or rubber insulation would degrade.
2. Thermal insulation wrapping for equipment and pipelines
PTFE fabric can be used as an outer wrap for thermal insulation blankets. It resists chemical spills, is easy to clean, and withstands high temperatures where the insulation is needed.
Summary – Why PTFE Fabric Is Essential in Chemical Plants
Application
Key Benefit
Gaskets & pipe lining
Resists all strong acids, alkalis, solvents
Reactor/tank lining
Prevents metal corrosion, easy cleaning, no metal ion contamination
Flexible, acid-resistant, withstands thermal movement
Welding pads
Spatter does not stick
Release cloth for curing
Non-stick demolding, reusable
Electrical/thermal wrap
Insulation, corrosion protection
Aokai PTFE manufactures PTFE high-temperature fabric in various thicknesses, weaves, and FDA/UL grades for chemical industry applications. Contact us to discuss your specific chemical environment, temperature range, and equipment type.
If you wish to know more about detailed specifications, application scenarios and customized solutions for our full product line, including PTFE high-temperature fabrics, PTFE high-temperature tapes, PTFE mesh belts, seamless bonding machine belts, single-sided PTFE cloth, high-temperature resistant conveyor belts and high-temperature resistant fiberglass fabrics, please contact us:
