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PTFE - POLYTETRAFLUOROETHYLENE

General characteristics

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PTFE is practically inert, does not react with other chemicals except in very specific situations. It is also one of the materials with the lowest coefficient of friction and this gives it an exceptional non-stick. Its discreet mechanical resistance is usually improved by incorporating glass loads, mineral salts (VX1), carbon / graphite, stainless steel, bronze, molybdenum bisulfide, etc., depending on the results to be improved.

hermal resistance: excellent behavior from -200 ºC a +260 ºC.

Atoxicity: inert material suitable for medical, pharmaceutical and food use, being able to meet the standards FDA, BgVV, and the USP Class VI.

Not porous: Non-stick to the vast majority of materials and adhesives, it is waterproof, ensuring perfect impermeability, with one of the lowest known coefficients of friction (0,01 the closest thing to ice).

Dielectric: It is a great electrical insulator, its dielectric constant is 2,1 and the power loss factor is 0,0002.

Atmospheric resistance: It has excellent weathering, ozone and radiation behavior UV.

Chemical resistance: resistant to the vast majority of chemical agents, greases and solvents.

Technical Data Sheet

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PTFE AND ITS MAIN LOADS
Properties Rule Unit Pure 25% Carbon 25% Glass 60% Bronze 15% Glass 15% Graphite 15% Glass
General
characteristics
Density ASTM D792 g/cm3 >2,16 >2,1 >2,25 >3,95 >2,2 >2,14 >2,2
Breaking strength ASTM D4864 MPa >25 >14 >13 >10 >17 >12 >12
Elongation at break ASTM D4864 % 300 150 250 100 280 150 200
Properties
Mechanical
Deformation 140 KG/cm2
100 h 23 °C
% 15 9 14 8 17 11 13
(*) P.V. 30,5 m/min kg/cm2 x m/s 65 550 460 650 420 500 450
Coefficient of friction Dynamic 0,15 0,25 0,3 0,25 0,25 0,12 0,2
Expansion coefficient 23 ºC a 260 °C x 10-5/°C 17 12 15 13 17 14 16
Conductibilidad térmica ASTM C177 Cal/s/cm/°C x 10-4 8 15 9,5 17 8 19 14
Volumetric resistivity ASTM D257 Ohm x cm 1018(**) 103 1016 108 1016 1011 1015
Surface resistivity ASTM D257 Ohm 1017(**) 103 1016 108 1016 1016 1014

(*) Factor P.V.: Load P (kg) per unit of sustaining surface (cm2) multiplied by linear velocity (m/s). It represents the maximum resistance of the compound with respect to the load and the speed (regardless of wear). (**) By adding a low percentage of conductive pigment, the volumetric resistivity and surface resistivity are reduced respectively to 2 x 103  and 103, without modifying other properties.



Chemical Resistance Chart

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< td> Ferric Sulfate < td> Excellent < / tr>
COMPOSITE RESISTANCE
Chemical products PTFA
AcetaldehydeExcellent
AcetoneExcellent
Aluminum sulfateExcellent
Ammonium ChlorateExcellent
Ammonium HydroxideExcellent
AnilineExcellent
BenzenoExcellent
Boric Acid Excellent
Brine Excellent
Bromine (Anhydrous) Excellent
Carbon disulfate Excellent
Chloroacetic acid Excellent
ChlorobenzenoExcellent
Chloroform < Excellent
Chronic acid Excellent
Citric Acid Excellent
Diethyl ether Excellent
EtilenglicolExcellent
Fatty Acids Excellent
Ferrous Chlorate Excellent
Excellent
Fluorsilisic Acid Excellent
Formic Acid Excellent
Freon (Liquid) < / td> Excellent
Hydroboric acid Excellent
Muriatic Acid Excellent
Hydrocyanic Acid Excellent
Hydrofluorite Acid Excellent
Sol. of H. Acid Sulfate Excellent
Maleic Excellent
Nitric Acid (0- 50%) Excellent
Nitro Benzene Excellent
PhenolExcellent
Phosphoric Acid
Phthalic Acid Excellent
Pícric Acid Excellent
Pyridine Excellent
Salicylic Acid Excellent
Silver Nitrate Excellent
Sodium Carbonate Excellent
Sodium Hydroxide Excellent
Sodium Nitrate Excellent
Sodium Peroxide Excellent
Sodium Silicate Excellent
Sodium Sulfate Excellent
Sulfuric Acid Excellent
Tannic Acid Excellent
Acid Tartaric Excellent
Trichlorethylene Excellent
Zinc Chlorate Excellent


Tolerance Margin

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PERMITTED DEVIATION FOR SIZE RANGES IN LINEAR DIMENSIONS. EXTRACT FROM SS-ISO 2768-1
Tolerancia clase Descripción fino medio grueso muy grueso
Desde (mm) Hasta (mm) ± ± ± ±
Dimensión Nominal 0,5* 3 0,0 0,10 0,20 -
3 6 0,05 0,10 0,30 0,50
6 30 0,10 0,20 0,50 1,00
30 120 0,15 0,30 0,80 1,50
120 400 0,20 0,50 1,20 1,50
400 1000 0,30 0,80 2,00 4,00
1000 2000 0,50 1,20 3,00 6,00
2000 4000 - 2,00 4,00 8,00
* For nominal sizes below 0.5 mm, the deviation will be indicated next to that size



DEVIATION PERMITTED FOR SIZE RANGES IN SLAUGHTERED CORNERS. EXTRACTO DE SS-ISO 2768-1
Tolerance class Description fine medium thick very thick < / th>
From (mm) Up to (mm) ± ±
Nominal Dimension 0,5* 3 0,20 0,40
3 6 0,50 1,00
6 30 1,00 2,00
* For nominal sizes below 0.5 mm, the deviation will be indicated next to that size

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