In chemical plants, refineries, and wastewater treatment facilities, equipment linings face a brutal environment: strong acids, hot alkalis, organic solvents, and temperature extremes. Rubber linings swell and crack. FRP linings blister. Stainless steel corrodes.
PTFE high-temperature fabric (PTFE-coated fiberglass) outperforms these traditional materials. It is chemically inert, heat-resistant, dimensionally stable, and non-stick – all in one.
Aokai PTFE has supplied PTFE fabric for anti-corrosion lining applications for decades. Below are four key advantages, plus real-world application examples.
Chemical Inertness – Resists Almost Everything
The core advantage of PTFE is its near-universal chemical resistance. It is often called the “King of Plastics” for good reason.
1. What it resists
Strong acids: Sulfuric, nitric, hydrochloric, phosphoric, and even aqua regia (a mixture of nitric and hydrochloric acids that dissolves gold)
Other corrosives: Oxidizers, salts, and most industrial chemicals
2. What it does not resist (limitations)
Molten alkali metals (sodium, potassium) – will destroy PTFE
Fluorine gas and strong fluorinating agents at high temperatures
Hydrofluoric acid (HF) – attacks the fiberglass substrate if the coating has pinholes
Practical note: For hydrofluoric acid service, use a special HF-resistant grade or ensure the PTFE coating is completely pinhole-free (multiple coating passes). Aokai PTFE offers such grades.
Wide Temperature Range – From Freezing to Extreme Heat
Anti-corrosion linings often face not just chemicals, but temperature extremes. PTFE fabric handles both ends of the spectrum.
1. High-temperature performance
Continuous operating temperature: -70°C to 260°C
Short-term peak: 350°C (brief excursions)
Thermal aging test: After 200 days continuous at 250°C, mechanical strength shows no obvious decline
2. Low-temperature performance
Remains flexible down to -70°C
Can withstand -180°C (liquid nitrogen temperatures) without cracking – though flexibility is reduced
3. Why this matters for lining applications
In desulfurization equipment, flue gas can reach 200-250°C. Rubber linings degrade above 120°C. PTFE fabric thrives. In cryogenic chemical processing (-50°C), PTFE does not become brittle like many plastics.
Physical and Mechanical Properties – Stable, Strong, and Non-Stick
Beyond chemical and thermal resistance, PTFE fabric offers several mechanical benefits that make it an excellent lining material.
1. Dimensional stability (low deformation)
The fiberglass substrate gives PTFE fabric high tensile strength and very low elongation – typically <0.5% under load. This means:
The lining does not stretch or sag over time
No wrinkling or buckling due to thermal expansion
Maintains tight fit against the equipment wall
2. Non-stick surface (easy cleaning)
PTFE’s friction coefficient is as low as 0.05-0.1. Most substances cannot adhere to its surface. For anti-corrosion linings, this means:
Residue from chemical reactions does not build up on the lining
Cleaning between batches is fast – often just a water rinse
No “baking on” of dried chemical deposits
3. Electrical insulation
Dielectric constant <2.6
High volume resistivity (>10⊃1;⁵ Ω·cm)
Suitable for insulating wraps in electronic and electrical equipment where corrosion protection is also needed
No measurable degradation after years of outdoor exposure
Food-Grade Certification – Safe for Food and Pharma
Not all anti-corrosion linings need to be food-grade. But when they do – in food processing, pharmaceutical, or potable water applications – PTFE fabric delivers.
1. Certifications
FDA 21 CFR 177.1550 – for direct and indirect food contact
EU Regulation 1935/2004 – for food contact materials
Non-toxic, odorless even at high temperatures
No leaching of harmful substances into food or pharmaceuticals
2. Where food-grade lining is used
Baking sheets and oven liners in commercial bakeries (non-stick, easy cleaning)
Pharmaceutical production equipment – reaction vessels and drying trays
Food processing tanks – where acidic or oily foods contact the lining
Typical Application Scenarios for Anti-Corrosion Lining
Based on the above advantages, PTFE high-temperature fabric is widely used in the following fields:
1. Chemical and environmental protection
Petrochemical pipelines – internal lining to prevent corrosion from crude oil, refined products, and sour gas
Desulfurization equipment (power plants) – lining for scrubbers, ductwork, and chimneys where flue gas contains SOₓ and HCl
Reaction vessels and storage tanks – lining for tanks holding concentrated acids, alkalis, or aggressive solvents
Pickling tanks (steel processing) – lining for tanks containing hydrochloric or sulfuric acid for metal cleaning
Field data from Aokai PTFE: In a power plant desulfurization tower, PTFE fabric lining lasted 3 years without failure. Rubber lining previously lasted only 9 months. That is a 4x life extension.
2. Food and pharmaceutical industry
Baking sheets and oven liners – non-stick, easy clean, FDA compliant
Microwave gaskets – heat-resistant and non-stick
Pharmaceutical production equipment – linings for drying trays, mixing vessels, and tablet coating pans
3. Machinery and electronics
High-temperature conveyor belts for photovoltaic laminators – combine anti-corrosion with non-stick and heat resistance
Heat sealing plates – PTFE fabric as non-stick cover
Electrical insulating liners – where both insulation and corrosion protection are required
Summary – Why Choose PTFE Fabric for Anti-Corrosion Lining
Advantage
Benefit
Chemical inertness
Resists aqua regia, strong alkalis, organic solvents
Temperature range
-70°C to 260°C continuous, 350°C peak
Dimensional stability
<0.5% elongation, no sagging or wrinkling
Non-stick surface
Easy cleaning, no residue buildup
Electrical insulation
Dielectric constant <2.6
Anti-aging & flame retardant
UV stable, self-extinguishing
FDA grades available
Safe for food/pharma contact
Long service life
3+ years in desulfurization (4x rubber)
Aokai PTFE manufactures PTFE high-temperature fabric specifically for anti-corrosion lining applications. We offer custom widths, thicknesses (0.08mm to 0.40mm), and FDA-certified grades. Contact us with your chemical environment, temperature range, and equipment dimensions for a lining recommendation.
If you would like to learn more about detailed specifications, application scenarios and customized solutions for our full range of products, 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 feel free to contact us:
