m The FACTS
Teflon®
Nonstick & Industrial Coatings The Facts on Teflon® ETFE Coatings
Primers 699-123 Water-Based, Black 532-6004 Powder, green High-Build Topcoat 532-6110 Powder, Clear 532-6114 Powder, Green 532-6118 Powder, Sparkling Beige 699-205 Liquid, Silver Ultra-Smooth Topcoat Powder 532-62532-6210 10 Clear 532-6200 White
Description ETFE, Ethylene TetraFluoroEthylene, is a thermoplastic Using appropriate product combinations, coating systems copolymer derived from the polymerization of ethylene are now available for use in a wide variety of applications and tetrafluoroethylene monomers. This resin is an - ranging from thin-film systems (75-250 µm, 3-10 mils) extremely tough and abrasion resistant material having for service involving abrasion resistance or mild chemical excellent chemical resistance and continuous operating service, to thick-film systems (up to 1300 µm, 50 mils) for temperatures up to 155C° (310°F). ETFE is also an linings where the ultimate chemical protection is required. excellent electrical insulator and has good nonstick and Thick-film TEFLON® ETFE coatings have been low friction properties. improved for application in thicker films per coat and for better sag resistance when approaching the final thickness. The application technique involves a "Spray & Bake" procedure whereby multiple coats, sprayed and baked individually, are used to achieve the desired final film thickness. The resulting finish is tough, seamless and without pinholes - perfect for applications in harsh chemical environments. The relative chemical inertness of TEFLON® ETFE also makes it ideal for applications where maintaining product purity is critical. Some of these thick film coatings are also suitable for food contact applications. The TEFLON® ETFE 532-6200 white gives a very smooth finish and an appealing colour for pharmaceutical or food contact applications.
The TEFLON® ETFE 532-6118 and its liquid equivalent The TEFLON® ETFE products listed above represent an 699-205 is a special filled grade with a very high expanded family of products based on new, improved resistance against water vapour permeation. In an Atlas formulations of ETFE resins - some of which are now in cell test with boiling water, after 1 year of exposure no compliance with FDA Food Contact regulations. blisters, bubbles or delamination could be found, even if only applied in 350µ thickness.
June 01 m The FACTS
Teflon®
Nonstick & Industrial Coatings Both have good chemical resistance. • ETFE is affected by strong oxidizing acids, strong organic bases and sulfonic acids at elevated temperatures. • ECTFE is affected by acids, bases and halogens at elevated temperatures, is attacked by amines, esters, and ketones, and is plasticized by halogenated solvents.
ETFE is More Chemically Resistant than ECTFE • In All Classes of Compounds • At Higher Temperatures
The primary reason is due to the presence of the Chlorine atom in the ECTFE repeating polymer unit. As shown in the table below, the strength of the Carbon-Chlorine bond is lower than that of the Carbon-Fluorine bond. Stronger atomic bonds are more difficult to break, either by chemical reaction or by thermal degradation.
BOND STRENGTH In-use and laboratory testing are ongoing to determine the Atomic pair Kjoules/mole permeation resistance against other chemicals. C - H 338 C - Cl 397 FDA Status C - F 552 TEFLON® ETFE coating systems consisting of 699-123 C - C 607 Primer and 532-6110, 532-6118, 532-6200 and/or 532- 6210 topcoats, when used up to 1300 µm (50 mils), Within the family of partially fluorinated resins ETFE is comply with FDA regulations governing components of more chemically stable because of a reaction mechanism coatings for direct food contact known as dehydrohalogenation. This involves the simultaneous removal of a pair of adjacent atoms from the Comparison with ECTFE C-C backbone chain. In the case of ETFE, this involves an atom of Hydrogen and an atom of Fluorine. The chemical structures of ETFE and ECTFE are similar, Even though the C-H bond is much weaker than the C-F as illustrated in the following molecular model bond, the Hydrogen atom has to wait until enough energy representations of the polymers. is supplied to the system to break the stronger C-F bond. The two atoms then come off as hydrogen fluoride (HF), leaving a C=C double bond in the polymer chain. ETFE Comparing ETFE with ECTFE, it is seen that the C-Cl bond strength is much weaker than that of C-F. Thus it takes less energy to remove a Chlorine atom. Under the same circumstances, therefore, ECTFE is more likely to undergo dehydrohalogenation to form hydrogen chloride (HCl) than ETFE is to form hydrogen fluoride (HF).
ECTFE Other differences between both resins can be found in the table on the next page.
June 01 m The FACTS
Teflon®
Nonstick & Industrial Coatings
Properties of ECTFE versus TEFLON® ETFE Property Method 532-6110 ECTFE Tensile Strength at 23°C, Psi ASTM D1708 5.500 6.600 Elongation, % at 23°C ASTM D1708 300 325 Flexural Modulus ASTM D790 93.500 220.000 Specific Gravity ASTM D792 1.75 – 1.79 1.65 – 1.71 Melting Point in °C ASTM D3159 245 - 250 220 Maximum in-use Temperature in °C 155 150 Thermal Conductivity, W/m.°C 0.24 0.15 Taber Abrasion, 1 kg per wheel, 1000 cycles, mg ASTM D4060 14.3 41.7 Critical Surface Tension, dyne/cm 27 32 Hardness, Shore D ASTM D785 72 75
In the table hereunder the max. in-use temperature for ETFE and ECTFE in contact with different substances has been indicated The best performer has been highlighted in blue. As can be seen from the table in most cases TEFLON® ETFE outperforms ECTFE . If you need this type of information for other specific chemicals not listed in the table, please consult us.
NR = not recommended NT = not tested
Chemical Compatability Data of ECTFE versus TEFLON® ETFE Maximum recommended in-use temperature in °C
Chemical 532-6110 ECTFE Acetic Acid (glacial) 110 100 Acetic Anhydride 150 93 Acetone 49 49 Acetophenone 150 93, NR at 100 Ammonium Hydroxide 150 150 Aniline 185 27 Aqua Regia 100 120
Benzene 120 93 Benzoyl Chloride 65 NT Benzyl Alcohol 150 150 Bromine (dry) 93 65 n-Butylacetate 110 60 n-Butylamine 50 NR at 21 Di-n-Butylamine 110 NR at 21 Tri-n-Butylamine 110 NR at 21
Carbon Tetrachloride 135 150(dry), 93 (wet) Chlorine (dry) 100 93 Choloroform 110 100 Chromic Acid (50%) 93 120 o-Cresol 190 93
June 01 m The FACTS
Teflon®
Nonstick & Industrial Coatings Cyclohexanone 155 50
Dichloroethylene 77 38 Dimethylaniline 135 93 Dimethylformamide 93 50 Dimethylsulfoxide 100 100 Ethyl Acetate 65 65
Freon 11 110 65 Ferric Chloride (50%) 150 150
Hydrobromic Acid (50%) 150 150 Hydrochloric Acid (20%) 150 150 Hydrochloric Acid (conc) 150 93 Hydrofluoric Acid (35%) 150 150 Hydrofluoric Acid (70%) 130 120 Hydrofluoric Acid (100%) 120 115 Hydrogen Peroxide (30%) 120 135 Hydrogen Peroxide (90%) 65 65
Methyl Ethyl Ketone 150 38 Methylene Chloride 21 21 Mineral Oil 180 150
Naptha 150 150 Nitric Acid (50%) 100 120 Nitric Acid (70%) 93 93
Phosphoric Acid (30%) 150 150 Phosphoric Acid (85%) 135 93 Phosphorous Oxychloride 110 NT Phosphorous Trichloride 120 120 Potassium Hydroxide (50%) 150 120 Pyridine 150 NR at 21
Silicon Tetrachloride 120 38 Sodium Hydroxide (50%) 120 120 Sulfuric Acid (60%) 150 150 Sulfuric Acid (fuming) 150 38
Tetrahydrofuran 100 38 TrichloroaceticAcid 150 49 Toluene 120 93
Zinc chloride 150 150
Plating solutions 135 65
June 01 m The FACTS
Teflon®
Nonstick & Industrial Coatings Further information
You can obtain further information on these TEFLON® ETFE coatings from the following persons:
For Europe, Middle-East, Africa: Cecile CORDONNIER Tel: +32-15-44 17 96 Fax: +32-15-44 11 60 E-mail: [email protected]
For the Americas: Paula MACRI Tel: +1-302-999-4685 Fax: +1-302-999-4754 E-mail: [email protected]
For Asia: Fumio INOMAE Tel: +81-3-5281 5891 Fax: +81-3-5281 5899 E-mail: [email protected]
The values shown in the tables of this brochure represent average experiences from numerous testing sources and are not intended to be specifications. These values will vary depending upon the individual compositions of the primers and topcoats and the systems used. Seller assumes no responsibility for results obtained or damages incurred from their use by Buyer in whole or part.
June 01