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Tedlar® TWH20BS3

Tedlar® TWH20BS3 is a protective film that helps extend the look and life of the design, even in the most extreme environments. From severe weather to harsh chemicals, the protective film provides long-term durability and performance. The protective film can easily be applied to a range of surfaces, providing the flexibility to design your way and the surface performance to keep it that way.

Brand: Tedlar (53 products)

Polymer Name: Polyvinyl Fluoride (PVF)

Physical Form: Film

Features: Acid Resistant, Alkali Resistant, Bacteria Resistant, Chemical Resistant, Cleanable, Corrosion Resistant, Crack Resistant, Durable, Excellent Dielectric Properties, Excellent Formability, Excellent Long Term Heat Aging Properties, Excellent Salt Spray Resistance, Excellent UV Stability, Fatigue Resistant, Flame Resistant, Flexible, Good Abrasion Resistance, Good Color Stability, Good Elongation, Good Printability, Good Processability, Good Stain Resistance, Good Surface Finish, Good Surface Gloss, Good Weather Stability, Heat Sealable, High Dielectric Strength, High Gas Permeability, High Temperature Resistance, Long Term Protection, Low Toxicity, Low VOC, Microbe Resistant, Mildew Resistant, Photolytic Degradation Resistant, Solvent Resistant, Sound Transmitting

Tensile Modulus: 2100.0 - 2600.0 MPa

Color: White

Enhanced TDS

Enhanced TDS

Knowde-enriched technical product data sheet

Identification & Functionality

Chemical Family

Features & Benefits

Labeling Claims
Tedlar® PVF Features in Aerospace Applications

DuPont™ Tedlar® protective film offers attractive, easy-to-clean, scuff-resistant surface protection to aircraft interiors. Tedlar® films are lightweight, have excellent conformability and offer superior resistance to harsh cleaners, chemicals and solvents, eliminating the need for repainting and reducing maintenance costs to help provide every passenger a fresh look on every flight.

The proven performance of Tedlar® film has made it the aircraft standard to which other materials used in the industry are measured. Tedlar® film meets or exceeds Federal Aviation Administration (FAA) and European Union Aviation Safety Agency (EASA) standards.

Design flexibility

Tedlar® film gives airlines maximum interior design flexibility to create passenger areas that are attractive and easy to clean. Tedlar® films can be embossed and printed, enabling the use of many unique texture designs and can be tailored to various gloss levels, thicknesses and finishes.

Fade resistant

Tedlar® film is available in an array of fade-resistant colors to match the look of your aircraft. If necessary, the colors can be matched long after the initial installation. Transparent Tedlar® film is also available as an excellent overlaminate for printed patterns.

Tedlar® for Architectural Sheet Metals

In coastal and tropical/sub-tropical natural environments with high temperature, high humidity and especially high salt spray, pollution brought by industrial development is gradually evolving into a highly corrosive atmospheric environment. Metals exposed to these environments for many years are highly susceptible to corrosive damage caused by moisture, oxygen and corrosive substances (such as impurities, acids, salt ions, dust and surface deposits).

Tedlar® film consists of 100% fluorocarbon resin without the addition of plasticizers such as acrylic acid (also known as acrylic or polymethyl methacrylate [PMMA]). The chemical stability and aging resistance of fluorocarbon resins ensure the excellent weatherability of Tedlar® . In addition, Tedlar® film for buildings and construction has been subjected to biaxial stretching to improve mechanical, optical and barrier film properties. The surface of the film is resistant to pinholes, cracks and other abrasions, and provides long-term effective protection for the metal substrate.

The excellent weatherability and corrosion resistance of Tedlar® film laminated metal sheets have been proven in numerous practical application cases over the past 30 years.

Tedlar® PVF Features in Architectural Applications
  • Resistant to weather, ultraviolet (UV) rays, fading and corrosion
  • Pliant and easily molded
  • Impervious to harsh chemicals and pollution
  • Easy to clean
  • Resistant to mold, mildew and bacteria
  • Environmentally safe

DuPont™ Tedlar® protective film helps extend the look and life of your design, even in the most extreme environments. From severe weather to harsh chemicals, Tedlar® protective film provides long-term durability and performance. Tedlar® protective film can easily be applied to a range of surfaces, providing the flexibility to design your way, and the surface performance to keep it that way.

Low maintenance costs : In addition to exceptional protection from the elements, Tedlar® provides an impervious barrier against stains and scuffs, making them easy to wipe away. And because it can stand up to the harshest industrial cleaning products, including bleach, Tedlar® protective film helps keep your designs looking their best.

Resistant to mold and mildew : Tedlar® protective films do not support mold or mildew growth, providing superior surface protection in even the most extreme and high-traffic environments. Additionally, Tedlar® won’t support bacterial growth, so it’s safe for you and for the environment.

Fade resistant: Tedlar® PVF is available in both transparent and opaque pigmented film. The color uniformity and fade resistance of pigmented Tedlar® protective film allows it to hold its color and maintain its original appearance for years. Transparent films allow long-term light transmission while greatly minimizing cracking, yellowing or fogging of the laminate.


Tedlar® film has delivered excellent weatherability and proven protection in a number of practical applications.

Japanese steel sheet plant

Founded in 1984, this steel sheet plant expanded its workshops in 2010 and installed Tedlar® film laminated steel sheets of the same color. As shown in the figure, the newly installed steel sheet has almost no difference in color and appearance compared with the steel sheet that has been used for 26 years.

In addition, although the plant is located in the coastal area, there is no obvious corrosion on the edges of the steel siding and at the screw holes, which indicates that the Tedlar® film provides effective protection for the steel sheet.

Chaoyang Park Tennis Center, Beijing, China

Laminated with Tedlar® film, this tennis center’s air bearing membrane roof has remained almost unchanged in color.

Okinawa Thermal Power Plant, Japan

Founded in 1986, this thermal power plant is located in the coastal area of Okinawa, less than 500 meters from the coastline. The high salt spray environment along the coast and the smoke in the power plant are very corrosive to buildings, especially metal sheets. After 27 years of erosion by wind and rain, the steel sheets protected by Tedlar® film revealed no signs of rusting at the edges and seams. Moreover, the film maintained an ultra-high color stability. After 27 years of use in the coastal environment, there is no obvious discoloration and chalking. There is almost no color difference compared with the sample left inside the plant in 1986.


With ultra-low color differences, a smooth and fine texture and excellent formability, Tedlar® film is stylish and esthetically pleasing from installation until its removal. Its matte surface finish even prevents light pollution.

  • Metal roofing panel : Tedlar® film’s lot-to-lot color reproducibility is controlled to a delta of <0.5.
  • Even & delicate surface finish : With an even surface finish, Tedlar® film prevents uneven thickness and pinholes caused by factors in processing.
  • Prevents light pollution : With a matte finish on the surface, Tedlar® film maintains an attractive esthetic without allowing light pollution.
  • Ease of machining and shaping : Tedlar® film is pliable and ductile, allowing for excellent processability and application.

Building façade in Yokohama, Japan

In 1983, a building in Yokohama, Japan, installed a façade using Tedlar® PVF film. The film is matte, with an even and delicate surface finish. Compared to the Tedlar® standard color chart, the exterior wall surface has almost no difference in color after three decades of use.

Building in Tokyo, Japan

In 1986, a building in Tokyo, Japan, applied Tedlar® PVF to its exterior walls. Due to the complexity of the wall shape, Tedlar® film—with its easy-to-use machining and shaping properties—was the ideal choice. After more than three decades of use, the wall has almost no difference in color.

Easy to Clean

Non-sticky and stain resistant, Tedlar® film can withstand all types of dirt and grime. Chemically inert, the film can be cleaned with various cleaning agents and requires little maintenance.

Tedlar® is stain resistant and chemically inert, so it can be completely cleaned with a cleaning agent, even when exposed to stubborn stains such as spray paint or caulking compound. Other finishes, such as fluorocarbon paint, may be damaged in cleaning due to poor chemical inertness.

  • Non-sticky and stain resistant : Tedlar® film resists all types of dirt, including bird droppings, water marks, paint, cooking fumes, grease, dust, acid rain and more.
  • Chemically inert : Tedlar® film can stand up to a wide variety of detergents and strong solvents to remove stains such as asphalt, tar, grease, paint or caulking compound.
  • Self-cleaning : Contaminants can be easily washed away by rain water, keeping the building’s appearance fresh and new, and reducing cleaning and maintenance costs.

Pedestrian bridge in Yokohama, Japan

Built in 1990, this pedestrian bridge in Yokohama, Japan, still remains esthetically pleasing after several decades of use. Tedlar® metal lamination was attached as a decorative panel to the side and bottom of the pedestrian bridge. Even today, the dust, moss and other stains on the Tedlar® surface are still very easy to clean, keeping the decorative surface clean and beautiful.

Safe & Environmentally Friendly

Tedlar® film is non-flammable and non-reactive, and it doesn’t support bacterial growth. Additionally, it produces minimal volatile organic compound (VOC) emissions during processing.

  • Excellent fire resistance: Tedlar® film is a component of structures that pass safety requirements for aircraft-grade fire resistance and low smoke toxicity. It is also recognized as a non-flammable material in Japan (NM0717, NM1553). Lamination onto metal sheet provides excellent fire resistance and low smoke toxicity.
    Applied to the interior of aircraft cabins
  • Exceptional bacteria resistance : Tedlar® film does not support the growth of bacteria, mold and mildew. It is especially suitable for places that require a high level of cleanliness, such as hospitals, hotels, restaurants and shopping malls.
    Applied to sterile operating rooms in hospitals
Colorful Enduring Empowering

Tedlar® PVF film provides a long-lasting finish to a wide variety of surfaces exposed to harsh environments. The color uniformity and fade resistance of Tedlar® allows it to hold its color and maintain its original appearance for decades.

Applications & Uses

Tedlar® PVF for Aerospace Applications
  • Interior ceiling and sidewall decorative panels
  • Window shades
  • Stow bins
  • Lavatories and galleys
  • Ceiling panels
  • Personal service units (PSUs)
  • Bulkhead partitions
  • Insulation barriers
  • Moisture barriers
  • Cargo bin liners
  • Aircraft wire markers
  • Composite noise panels
  • Partitions
  • Monuments
  • Closets
  • Landing Gear Bay
  • Cargo Protection
  • Labeling
  • Composite Release
  • Composite Protection
Current Use Case: Tedlar® in Commercial Passenger Aircraft
  • Tedlar® has protected the interiors of aircraft since 1964 and continues to be the industryrecognized standard today.
  • Tedlar® was chosen in commercial aircraft due to its high standard of non-flammability. It is certified by FAA and EASA with excellent fire resistance.
  • Tedlar® continues to be used because of its durability. The interior of aircraft see thousands of customers over years and are able to stay looking clean year in year out.
Tedlar® PVF for Architectural Applications
  • Wallcoverings
  • Residential and commercial roofing, siding, trim and accents
  • Formed or flat metal building panels
  • Flexible laminates for air-inflated structures, canopies, awnings and stadium domes
  • Indoor and outdoor fabrics
  • Curtain walls
  • Healthcare facility surfaces
  • Pipe and vessel jacketing


Physical Form
Mechanical Properties
ValueUnitsTest Method / Conditions
Tensile Modulus - MD3GPaASTM D882-18
Tensile Modulus - TD2.7GPaASTM D882-18
Yield Stress - MD34MPaASTM D882-18
Yield Stress - TD34MPaASTM D882-18
Yield Strain - MD1.6%ASTM D882-18
Yield Strain - TD1.7%ASTM D882-18
Ultimate Strength - MD130MPaASTM D882-18
Ultimate Strength - TD72MPaASTM D882-18
Elongation at Break - MD130%ASTM D882-18
Elongation at Break - TD195%ASTM D882-18
Physical Properties
ValueUnitsTest Method / Conditions
Coefficient of Friction (Film on Metal)0.18 - 0.21-ASTM D1894
Density of White Film1.7g/ccASTM D1505
Falling Sand Erosion (on PET Backing)04-AugL/µmASTM D968
Falling Sand Erosion (on PET Backing)4-8L/µmASTM D968
Impact Strength45 - 89J/mmASTM D3420
Moisture Absorption (for most types)max. 0.5%Water Immersion
Optical Transmission of Clear Films93%ASTM D1003
Refractive Index of Clear Films1.46-ASTM D542
Shore HardnessD60 - D70-ASTM D2240
Strain at Break90 - 250%ASTM D882
Tear Strength (Initial)100 - 200N/mmASTM D1004
Tear Strength (Propagated)5.9 - 24N/mmASTM D1922
Tensile Modulus2.1 - 2.6GPaASTM D882
Ultimate Strength55 - 110MPaASTM D882
Yield Strength34 - 41MPaASTM D882
Thermal Properties
ValueUnitsTest Method / Conditions
Coefficient of Thermal Expansion5 - 10 x 10^-5m/m·KASTM D696
Lower Glass Transition Temperature15 to -20°CVarious
Peak Melting Temperature190 - 210°CASTM E1269
Relative Thermal Index - Electrical Strength140°CUL 746B
Relative Thermal Index - Mechanical Impact120°CUL 746B
Relative Thermal Index - Mechanical Strength125°CUL 746B
Specific Heat Capacity1.0 - 1.1kJ/kg*KASTM E1269
Temperature Range (continuous use)-70 to 105°C-
Upper Glass Transition Temperature40 - 50°CVarious
Electrical Properties
ValueUnitsTest Method / Conditions
Corona Endurance (60 Hz at 1 kV/mil)6.2hrsASTM D2275
Dielectric Constant (1 kHz at 22°C)11-ASTM D150
Dielectric Strength (60 Hz)140kV/mmASTM D150
Dissipation Factor (1kHz at 22°C)1.4%ASTM D150
Dissipation Factor (1kHz at 70°C)1.7%ASTM D150
Dissipation Factor (10kHz at 22°C)3.4%ASTM D150
Dissipation Factor (10kHz at 70°C)1.6%ASTM D150
Volume Resistivity (at 22°C)7 x 10^13Ω cmASTM D257
Volume Resistivity (at 100°C)1.5 x 10^11Ω cmASTM D257
Hot-Wire Ignition0 PLC-UL 746A
High Amp Arc Ignition0 PLC-UL 746A
Comparative Tracking Index0 PLC-UL 746

Regulatory & Compliance

Quality Standards

Technical Details & Test Data

Metal Lamination

Product structure and processing flow

Tedlar® film is laminated onto a metal substrate using a special adhesive invented by DuPont based on a hot laminating process. The process and product structure are similar to those of a fluorocarbon coil coated metal sheet. The figure below illustrates the differences between Tedlar® film lamination and fluorocarbon baking coating.

Structural comparison of Tedlar® film laminated steel sheet vs. sheet with fluorocarbon baking coating

DuPont Tedlar TWH20BS3 Metal Lamination - 1

Metal Lamination Process of Tedlar® film

DuPont Tedlar TWH20BS3 Metal Lamination - 2

Building Solutions

System solutions for building

Tedlar® film-based metal lamination

Tedlar® film-based metal lamination provides a guarantee of more than 30 years of service life for the roofing of any new project.

Product structure example

DuPont Tedlar TWH20BS3 Building Solutions - 1

Tedlar® metal lamination product structure

DuPont Tedlar TWH20BS3 Building Solutions - 2

Metal roof panel structure diagram

Composite metal sheet with Tedlar® film interior finish

Tedlar® film interior finishes not only have the delicate texture of fabric, but also have excellent properties such as fire-, stain- and corrosion-resistance and ease of cleaning. Organic combination with steel sheet makes the Tedlar® interior finish suitable for medical environments.

DuPont Tedlar TWH20BS3 Building Solutions - 3

Membrane fabric materials laminated with Tedlar® film

Tedlar® film can be laminated with various coated fabrics to form membrane fabric structures at much lower construction costs than steel. With excellent weatherability and dirt-shedding properties, membrane fabric is a cost-effective material for buildings like stadiums, convention centers, commercial facilities and transportation hubs.

DuPont Tedlar TWH20BS3 Building Solutions - 4

Composition of membrane fabric materials

Improve the Corrosion Resistance and Service Life of Steel Sheets with Tedlar®

DuPont Tedlar TWH20BS3 Improve the Corrosion Resistance and Service Life of Steel Sheets with Tedlar

The picture above shows the rooftop of an industrial plant. The rooftop of the plant consists of two parts. The lower left is Tedlar® film laminated steel sheet installed in 1983, and the upper right roof is steel sheet coated with other material installed in the late 20th century. Although the roof sheets are the same shape and used in the same environment, the appearance of the steel sheet roofs coated with different materials shows a huge difference.

The steel sheet roof not laminated with Tedlar® has been severely rusted, while the Tedlar® film laminated steel sheet roof appears as durable as new after more than 30 years of use.

Caulking Compound and Solvent Cleaning Test

DuPont Tedlar TWH20BS3 Caulking Compound and Solvent Cleaning Test

Chemical Resistance

Acid and alkali resistance – Test 1

To test the acid and alkali resistance, experimenters placed drops of concentrated sulfuric acid (98%) on the surface of samples of Tedlar® and PVDF for 24 hours.

DuPont Tedlar TWH20BS3 Chemical Resistance - 1

Acid and alkali resistance – Test 2

After Tedlar® film laminated steel sheet (gray) and PVDF fluorocarbon paint coated steel sheet (blue) have been soaked in 5% hydrochloric acid and 5% sodium hydroxide solution for 30 days at room temperature, obvious bubbling appears on the surface of the PVDF-coated steel sheet, which indicates that the substrate is severely corroded, while the Tedlar® film laminated steel sheet is free of bubbling, delamination, etc., indicating that the Tedlar® film-protected steel sheet has excellent resistance to acid and alkali.

30-day acid and alkali soaking test

DuPont Tedlar TWH20BS3 Chemical Resistance - 2

Salt spray resistance test

Tedlar® film and PVDF coating were exposed to salt spray for 2,000 hours.

DuPont Tedlar TWH20BS3 Chemical Resistance - 3

High-temperature acid gas resistance test

This case is a steel roofing sheet project of the synthesis workshop in a chemical plant. Because high-temperature acid gas produced in the synthesis workshop causes severe corrosion to the original steel roof panel, the building owner must replace the roof every two years, which not only affects normal operation of the plant, but also poses a large production safety hazard. The plant replaced some of its roofing with Tedlar® film laminated steel sheets in 2016. After two years, the normal roof was still corroded and had to be replaced regularly, but the new roof panel using the Tedlar® film laminated steel sheets had no corrosion and remained esthetically pleasing.

Original steel sheet roofing

DuPont Tedlar TWH20BS3 Chemical Resistance - 4

Tedlar® film laminated steel sheet roofing at far right

DuPont Tedlar TWH20BS3 Chemical Resistance - 5

Chemical resistance of Tedlar® film

Experimenters immersed Tedlar® film in the following chemicals. The checkmarks indicate no significant change in tensile strength and ultimate elongation.

    1-year immersion at room temperature 2-hour immersion at boil 31-day immersion at 75°C (167°F)
Acids Acetic acid (glacial)  
Hydrochloric acid (10% & 30%)    
Hydrochloric acid (10%)  
Nitric acid (20%)    
Nitric acid (10% & 40%)    
Phosphoric acid (20%)    
Sulfuric acid (20%)    
Sulfuric acid (30%)    
Bases Ammonium hydroxide (12% & 39%)    
Ammonium hydroxide (10%)    
Sodium hydroxide (10%)  
Sodium hydroxide (10% & 54%)    
Solvents Acetone  
Benzyl alcohol    
Ethyl acetate    
Ethyl alcohol    
Methyl ethyl ketone (MEK)    
Miscellaneous Phenol    
Phenol (5%)    
Sodium chloride (10%)    
Sodium sulfide (9%)    
Tricresyl phosphate    
Weather Resistance

Accelerated aging and UV exposure test

As test results show, compared with the surface protection coatings such as acrylic and PVDF, Tedlar® film can better resist UV and acid rain, prevent dust buildup, and retain its thickness, color and gloss for a longer time, thus maintaining the building’s original appearance for longer.


DuPont Tedlar TWH20BS3 Weather Resistance - 1Gloss

DuPont Tedlar TWH20BS3 Weather Resistance - 2


DuPont Tedlar TWH20BS3 Weather Resistance - 3

15-year Florida weather exposure test

Florida’s outdoor exposure field is recognized in the industry as a standard test site for assessing the weatherability of coatings. Ten-year Florida exposure is an important indicator of the American Architectural Manufacturers Association (AAMA) 2605, which is the highest weatherability rating for PVDF. Not only has Tedlar® film passed the 15-year Florida exposure test (color difference E < 4.5), but its color stability and weatherability rating is 50% higher than ordinary PVDF.

Tedlar® Florida weathering data: color change

DuPont Tedlar TWH20BS3 Weather Resistance - 4

Abrasion Resistance & Processability

Abrasion resistance test

Falling sand abrasion tests (ASTM D968) were conducted for 25-micron PVDF coating, 100-micron multilayer hot melt coating and Tedlar® film. The results show that the abrasion resistance of 37.5-micron Tedlar® film surpasses that of PVDF, but is identical to that of 100-micron multilayer hot melt coating.

DuPont Tedlar TWH20BS3 Abrasion Resistance & Processability - 1

0T bending test

A 180° 0T bending test (seen here at 40x magnification) shows that the PVDF-coated steel sheet has obvious cracks, while the Tedlar® film laminated steel plate shows no cracks. With film elongation up to 100%, Tedlar® has outstanding processability.

DuPont Tedlar TWH20BS3 Abrasion Resistance & Processability - 2

Processability Test

Tedlar® has an elongation of more than 100% and doesn’t crack after 0T bending, thus protecting the sheet from corrosion. It allows for complex sheet shaping during processability, with no discoloration at the bend. Additionally, there is no rusting on the punched steel sheet after a 2000-hour salt spray test.

DuPont Tedlar TWH20BS3 Abrasion Resistance & Processability - 3

Tedlar® PVF Film Passes SGS Test
Test items Test methods Test contents Test results Remarks
Weathering test (4000 hours) Weathering test CNS 15200-7-7 (2013) Appearance No cracking, blistering, etc. 1. Condition basis: refer to ASTM G154-12a Cycle 1
2. Illuminance: 0.89 W/m2 /nm
3. Light source type: UVA 340
4. Cycle conditions: 8h UV at 6°C BPT; 4h condensation at 50°C BPT
5. The sample is subject to 0T bending and 9.5 mm cupping before testing
Gloss CNS 10756-1 60° gloss retention (%) 100%
Fading (color difference) ASTM D2244-11 4000 hours ∆E: 0.33
Chalking test ASTM D4214-07 Powdering degree Level 10
Damp heat resistance test (4000 hours) Damp heat resistance test CNS 11607 Appearance No cracking, blistering, etc. 1. Moisture and heat resistance test conditions: temperature: 50 ± 2°C, humidity: 95 ± 5% RH
2. The sample is subject to 0T bending and 9.5 mm cupping before testing
Gloss test CNS 10756-1 60° gloss retention (%) 98%
Rusting grade rating ASTM D1654-92 Rusting grade Level 10
Salt spray test (4000 hours) Salt spray test CNS 8886 (2002) Appearance No cracking, blistering, etc.

Salt spray test conditions

1. Experimental salt: analytical reagent
2. Saline concentration: 5 w/v% NaCl
3. Experimental water: pure water
4. Spray exposure zone temperature (°C): 35.0 ± 1.0
5. Spray amount (ml/h/80 cm2 ): 1.7 (avg.)
6. Supply air pressure (kgf/cm2 ): 1.0 (avg.)
7. Cleaning method: before the test— rinse with 38°C warm water, then wipe and dry
8. Solution pH: 6.8 (avg.)
9. Sample placement: vertical placement with an inclination of 15 degrees
10. Sample protection method: rubber seal on four sides
11. The sample is subject to 0T bending and 9.5 mm cupping before testing

Rusting grade rating ASTM D1654-92 Rusting grade Level 10
Acid and alkali resistance test Acid resistance test CNS 10757 (1995) 20% H2 SO4 , room temperature, 360 hours Immersion in acid solution without abnormality  
Alkali resistance test CNS 10757 (1995) 25% H2 SO4 , room temperature, 360 hours Immersion in acid solution without abnormality 1. The sample is subject to 0T bending and 9.5 mm cupping before testing
Chemical resistance AAMA 2605-13

Nitric acid, after 30 minutes

Nitric acid, after 168 minutes

No significant change in color

No significant change in color

Physical property test Impact test CNS 10757 (1995) 160in.-lb No cracking, peeling, etc.  
Bending test ASTM D4145-83 (2002)   0T (no cracking, peeling, etc.)  
Cupping test CNS 10757 (1995)   10.49 mm  
Abrasion resistance (falling sand abrasion method) ASTM D968-05 (2010) Abrasion resistance (L/mil)(falling sand amount L) 127
Tedlar® Film Classification

Tedlar® PVF films are available as either biaxially oriented or unoriented cast film. The biaxially oriented film is stretched to various degrees in both the machine and transverse direction during manufacturing, imparting a range of different mechanical properties on the product depending on the amount of molecular orientation. The amount of orientation is described by the film type, listed as the last digit on the product code. The unoriented film, also known as ‘SP’ film, is cast onto a PET carrier web and is sold with the PET web attached. The Tedlar® film can be easily stripped from the PET carrier web. Films of Type 1 through 5 are oriented, while Type 8 is unoriented. Table 1 provides a summary of the various film types.

Type 3 films are the most commonly used films due to the balanced properties, including good strength and moderate shrinkage at elevated temperatures. Type 5 films are used when additional formability is needed in creating formed parts after lamination that require deep draws. Type 8 films have the highest formability and lowest shrinkage due to the nature of the processing and are used in the most demanding forming applications. In both Type 5 and Type 8 films, the reduced orientation leads to lower strength. Type 1 films are sometimes used when higher shrinkage is required, for example, to match the shrinkage of an underlying substrate during manufacture.

Table 1.The typical mechanical properties of various types of Tedlar® PVF films.

Film Type Orientation Shrinkage at 170°C Elongation at Break Strength Typical Use
Type 1 High High Low High High shrinkage applications
Type 3 Balanced Medium Medium Medium General applications
Type 5 Low Low High Low High formability
Type 8 (SP) None Low Very High Low Very high formability
Shrinkage of Tedlar® Films

Tedlar® oriented films will shrink when they are subject to heating without constraint. The amount of dimensional change depends most strongly on the temperature and orientation, with higher temperature and higher orientation causing the greatest shrinkage. This behavior is illustrated in Figure 2 and Tables 3 and 4 for some white and clear films with different orientation types. In general, film shrinkage increases as the type decreases from Type 8 to Type 1 films. In some instances, the films will expand slightly with initial heating in one of the two orthogonal in plane directions, then contract at higher temperature. This behavior will impact web handling through heated zones and precautions may need to be taken to properly spread and laterally tension the film during processing.

The force required to prevent the film from shrinking in either direction is relatively small. For example, at 180 °C, the typical force required to prevent shrinkage in 1 mil films are shown in Table 5.

DuPont Tedlar TWH20BS3 Shrinkage of Tedlar Films

Figure 2: Typical machine and transverse direction shrinkage for white and clear films of Type 3, 5 and 8. The values provided are averages of machine and transverse direction shrinkage.

Table 3: Typical shrinkage as a function of temperature in both machine and transverse direction for three different white films.

Test Temperature (°C) TWH20BS3 White, 2 mil Type 3
Film Orientation MD TD
130 3 0
140 0 0.1
150 3 -0.1
160 4 -0.1
170 4 4
180 7 4
190 15 20

Table 6: Films with typical mechanical data at various temperatures shown below

Film Type Temperature Range (°C)
TWH20BS3 White, 2 mil, Type 3 22 to 150
Mechanical Properties at Elevated Temperature

There are several thermal transitions present in PVF film which can affect the mechanical properties. The lowest thermal transition temperature occurs in the glassy polymer at -80°C and is associated with local amorphous relaxation on short chain segments. At -15 to -20°C, a lower glass transition occurs which is believed to be related to relaxation of amorphous regions free from restraint of crystallites. An upper glass transition temperature occurs at around 40 to 50°C due to relaxation of amorphous regions which are under restraint by crystallites. Another transition occurs at around 150°C due to pre-melting relaxation in the crystallites. Finally, the polymer exhibits peak melting around 190 to 210°C.

Tedlar® PVF films performs well in temperatures ranging from approximately -72 to 107°C (-98 to 225°F), with intermittent shortterm peaking up to 204°C (400°F). Lower temperatures increase the strength and elastic modulus, and decrease the elongation of the film. Higher temperatures soften the Tedlar® film and decrease the amount of elastic response. The elongation of the film increases slightly with temperature, up to a maximum at around 100°C, and then the elongation typically decreases with increased heating. Since Tedlar® films contain no plasticizers, the mechanical properties are stable throughout exposure at elevated temperatures. The typical mechanical properties as a function of temperature from -40°C to 150°C are shown for a Type 3 clear, UV blocking film (TGP10BG3) and a Type 3 white film (TWH15BL3). The properties are shown from 22°C to 150°C for a variety of other white and clear films with various thickness and orientation.

TWH20BS3 (2 mil white film, type 3 orientation):

DuPont Tedlar TWH20BS3 Mechanical Properties at Elevated Temperature - 1

DuPont Tedlar TWH20BS3 Mechanical Properties at Elevated Temperature - 2