PTFE - POLYTETRAFLUOROETHYLENE

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General characteristics
Technical Data Sheet
Chemical Resistance Chart
Tolerance Margin

General characteristics

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

**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 23ºC	%	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	23ºC a 260ºC	x 10^-5/ºC	17	12	15	13	17	14	16
	Conductibilidad térmica	ASTM C177	Cal/s/cm/ºC 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

**COMPOSITE RESISTANCE**
	Chemical products	PTFA
	Acetaldehyde	Excellent
	Acetone	Excellent
	Aluminum sulfate	Excellent
	Ammonium Chlorate	Excellent
	Ammonium Hydroxide	Excellent
	Aniline	Excellent
	Benzeno	Excellent
	Boric Acid	Excellent
	Brine	Excellent
	Bromine (Anhydrous)	Excellent
	Carbon disulfate	Excellent
	Chloroacetic acid	Excellent
	Chlorobenzeno	Excellent
	Chloroform	Excellent
	Chronic acid	Excellent
	Citric Acid	Excellent
	Diethyl ether	Excellent
	Etilenglicol	Excellent
	Fatty Acids	Excellent
	Ferrous Chlorate	Excellent
	Ferric Sulfate	Excellent
	Fluorsilisic Acid	Excellent
	Formic Acid	Excellent
	Freon (Liquid)	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
	Phenol	Excellent
	Phosphoric Acid	Excellent
	Phthalic Acid	Excellent
	Picric 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

**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	thick
	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