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  Properties of Teflon™ Industrial Coatings

 

Teflon industrial coatings: PTFE coatings, FEP coatings, PFA coatings, ETFE coatings, coating primers, specialty systems, and more.

The following characteristics are common to all Teflon coatings in varying degrees.  The unique combination of properties inherent to all Teflon industrial coatings make them a natural choice in a number of industries.

NonstickNON-STICK - Very few solid substances will permanently adhere to a Teflon coating. While tacky materials may show some adhesion, almost all substances release easily. Wear due to sliding is very low due to the anti-adhesive properties. For many applications, a significant problem is the buildup of foreign particles, and Teflon nonstick coatings’ excellent release qualities help solve these issues.


Low frictionLOW COEFFICIENT OF FRICTION – Friction is a force created when two objects rub together that hinders the motion. With a Teflon industrial coating, the coefficient of friction is generally lowered to a range of 0.05 to 0.20, depending on the load, sliding speed, and type of coating used. Lubricity is very important in any application that has moving parts touching each other.

Heat resistanceHEAT RESISTANCE - Teflon fluoropolymer coatings can operate continuously at temperatures up to 550ºF, and can be used for intermittent service up to 600ºF with adequate ventilation. The thermal stability of the coatings means that they can be used in high heat environments without losing or affecting any other properties.
 
Cryogenic stability
CRYOGENIC STABILITY - Many Teflon coatings can withstand temperatures as low as -454ºF without loss of physical properties. Their ability to withstand sub-freezing temperatures means that Teflon industrial coatings will not lose any of their other characteristics when exposed to such low temperatures.

Chemical resistanceCHEMICAL RESISTANCE - Chemical environments usually do not affect a Teflon fluoropolymer coating.  The only chemicals known to affect these coatings are molten alkali metals and highly reactive fluorinating agents. Permeation resistance due to the low porosity of the coatings means that they are extremely corrosion resistant and are chemically inert.


NonwettingNON-WETTING – Teflon nonstick coatings are both hydrophobic and oleophobic. The low surface energy of the coatings means that the cohesive forces in the water are strong enough to make the water bead up and not spread across the surface of the coating. Cleanup is easier and more thorough.

Unique electrical propertiesUNIQUE ELECTRICAL PROPERTIES - Over a wide range of frequencies, Teflon coatings have a high dielectric strength, low dissipation factor, and high surface resistivity.  Dielectric strength is the highest voltage that the coating can withstand before it breaks down. The dissipation factor is the percentage of electrical energy absorbed and lost when current is applied to the coating. A low dissipation factor means that the absorbed energy dissipated as heat is low. Adding fillers to certain coatings can make them electro-conductive enough to be used as an anti-static coating.

Abrasion resistanceABRASION RESISTANCE - Teflon coatings are very resistant to scratches and abrasion due to their excellent durability and toughness. Surface scarring is minimal, especially in certain coatings when fillers are added. 

FDA ConformingFDA CONFORMING – Many Teflon industrial coatings are approved for food contact by the Food and Drug Administration. These specific Teflon coatings can be used for direct food contact according to the regulations of 21CFR. All types of Teflon™ coatings have FDA conforming options. Check a coating’s fact sheet to see if it is FDA compliant. 
 
Property ASTM Method Unit Teflon™ PTFE Teflon™ FEP Teflon™ PFA Teflon™ ETFE
Non-Stick none --- Excellent Excellent Excellent Good
Abrasion Resistance none --- Fair Good Very Good Excellent
Chemical Resistance none --- Good Excellent Excellent Excellent
Max Use Temperature   °F
°C

°F
°C

550
290

600
315

400
205

450
230

500
260

550
290

300
150

390
200

Melting Point D3418 °F
°C
621
327
500
260
582
305
512
267
Specific Gravity D792   2.15 2.15 2.15 1.76
Coefficient of Friction D1894 Static

Dynamic

.12 - .15

.05 - .10

.12 - .20

.08 - .30

.20

 

.24 - .50

.30 - .40

Hardness D2240 Shore D 50 - 65 56 60 72
Tensile Strength D638 Mpa 21 - 35 23 25 40 - 47
Elongation D638 % 300 - 500 325 300 150-300
Flexural Modulus D790 Mpa 500 600 600 1200
Thermal Conductivity   see note 1 1.7 1.4 1.3 1.65
Dielectric Strength D149 V/µm 18 53 80 79
Dielectric Constant D150 1 MHz 2.1 2.1 2.1 2.6
Arc Resistance D495 sec >300 >300 >180 122
Volume Resistivity D257 ohm·cm >10 18 >10 18 >10 18 >10 17
Surface Resistivity D257 ohm/sq. >10 18 >10 16 >10 17 >10 15
Weather Resistance Florida Exposure years unaffected 20 20 10 15
Water Absorption D570 % <.01 <.01 <.03 <.03
Contact Angle   water ° 104-111 95-105 104-111 90-100
 

note 1: thermal conductivity units = (BTU)(in) /(ft2)(hr)(deg F)

 

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