PFA welding, Modified PTFE lining, TFM, Perfluoralkoxy , Corrosion protection, Fluoroplastics lining

MATERIALS

Fluoroplastics - Chemical Resistance

		Chemicals	Concen.(%)	Temp.(°C)	PTFE& modif. PTFE	PFA	FEP	ETFE	THV 500	PVDF
Acid
	Organic	Trichloroacetic Acid		23	+	▲	+	+	▲	+
		Trichloroacetic Acid		50	+	▲	+	•	-	+
		Trichloroacetic Acid		100	+	+	▲	▲	▲	▲
	Inorganic	Hydrochloric Acid	36	23	+	▲	+	+	+	+
		Hydrochloric Acid	36	100	+	-	▲	•	+	+
		Hydrochloric Acid	36	155	+	-	•	▲	▲	+
		Sulfuric Acid	96	23	+	▲	+	+	▲	+
		Sulfuric Acid	96	100	+	+	▲	+	+	-
		Sulfuric Acid	96	155	+	+	+	▲	▲	-
		Phosphoric Acid	conc.	100	+	+	▲	+	+	+
		Phosphoric Acid	conc.	165	+	+	•	▲	▲	+
		Hydrofluoric Acid	40	100	+	+	+	▲	•	+
		Hydrofluoric Acid	40	155	•	+	▲	▲	▲	▲
		Hydrofluoric Acid	49	35	+	▲	+	▲	+	+
		Hydrofluoric Acid	49	155	•	+	▲	▲	▲	▲
		Nitric Acid	conc.	23	+	▲	+	+	▲	•
		Nitric Acid	conc.	100	+	▲	▲	+	+	-
		Nitric Acid	conc.	155	+	•	•	▲	▲	-
		Fluorosulfonic Acid		100	•	•	▲	+	▲	▲
		Chlorosulfonic Acid		100	+	+	▲	-	▲	•
		Chromosulfonic Acid		100	+	+	▲	•	▲	-
Alcohols
		Ethylene Glycol		100	+	+	▲	▲	▲	+
		Methanol		23	+	+	+	+	•	+
		Methanol		50	+	+	▲	+	•	•
Amides
		Dimethylacetamide		50	+	▲	+	-	-	-
		Dimethylacetamide		100	+	+	▲	•	▲	-
		Dimethylformamide		23	+	▲	+	▲	▲	-
		Dimethylformamide		50	+	▲	+	+	-	-
		Dimethylformamide		100	+	•	▲	+	▲	-
		N-methylpyrrolidone		23	▲	▲	+	▲	-	-
		N-methylpyrrolidone		50	+	▲	▲	▲	-	-
		N-methylpyrrolidone		100	+	+	+	▲	-	-
Amines
		Benzyl Amine		23	+	▲	▲	+	▲	▲
		Benzyl Amine		100	+	▲	▲	•	▲	▲
		N-Butyl Amine		100	+	▲	▲	•	▲	▲
Bases
		Ammonia	25	23	+	+	+	▲	-	-
		Sodium Hydroxide	25	23	+	▲	+	▲	▲	-
		Sodium Hydroxide	50	23	+	+	+	▲	+	-
		Potassium Hydroxide	50	23	+	+	+	▲	+	+
		Potassium Hydroxide	50	100	+	+	▲	-	▲	+
Esters
		Ethyl Acetate		23	+	▲	•	•	-	•
		Ethyl Acetate		50	+	▲	▲	▲	-	-
		Ethyl Acetate		100	+	▲	▲	•	▲	-
Ethers
		Tetrahydrofuran		23	+	+	+	-	-	•
		Tetrahydrofuran		50	▲	•	-	-	-	•
Halogens
		Chlorine gas		23	+	•	▲	+	+	•
		Iodine		23	+	+	▲	▲	▲	+
		Bromine		23	+	+	▲	+	▲	+
Halogenated Hydrocarbons
		1,1 - Dichloroethane		23	•	▲	▲	+	▲	▲
		1,1 - Dichloroethane		50	•	▲	▲	+	▲	▲
		1,2 - Dichloroethane		23	•	▲	▲	+	▲	+
		1,2 - Dichloroethane		50	•	▲	▲	+	▲	+
		1,2 - Dichloroethane		100	•	▲	▲	+	▲	+
		1,4 - Dichlorobutane		23	+	▲	▲	+	▲	▲
		1,1,2 - Trichloroethane		23	•	▲	▲	•	▲	▲
Hydrocarbons
	Aliphatic	Iso Octane		23	+	+	+	+	+	▲
		Iso Octane		50	+	+	▲	▲	+	▲
		Hexane		23	+	▲	•	▲	+	+
	Aromatic	Toluene		23	+	+	+	•	•	+
Ketones
		Acetone		23	+	+	+	+	-	-
		Acetone		50	+	▲	▲	▲	-	-
		Acetone		100	+	▲	▲	•	▲	-
		Methyl Ethyl Ketone		23	+	▲	+	▲	-	-
		Methyl Ethyl Ketone		50	+	▲	▲	-	▲	-
		Methyl Ethyl Ketone		80	+	+	▲	▲	▲	-
Other Heterocycles
		Benzyl Chloride		23	•	▲	+	▲	▲	+
		Pyridine		23	+	▲	+	-	▲	+

+ Weight change <0.5%, change in mechanical properties <10%
• Weight change 0.5% - 1.0%, change in mechanical properties 10% - 20%
- Weight change >1.0%, change in mechanical properties >20%
▲ No information available
★ Mechanical properties are defined as tensile strength and percent elongation

Fluoroplastics - Typical Properties

	Test Method	Unit	PTFE	Modif. PTFE	PFA¹	FEP¹	ETFE¹	THV 500²	PVDF²
Physical Properties
Specific Gravity	ASTM D792, ISO 1183	g/cm³	2,16	2,16	2,15	2,15	1,73	1,98	1,78
Melting Point	ASTM D4591	°C	327	327	310	260	266	165	174
Service Temperature
minimum		°C	-200	-200	-200	-200	-190	▲	▲
maximum		°C	260	260	260	205	150	130	▲
Mechanical Properties	DIN EN ISO 527
Tensile Strength at Break
@ 23 °C		MPa	36	35	30	30	46	28	35-50
@ 100°C		MPa	22	25	24	14	20	12	▲
Elongation at Break
@ 23 °C		%	400	560	380	350	450	500	20-50
@ 100°C		%	520	590	440	320	600	590	▲
Tensile Modulus	DIN EN ISO 527
@ 23 °C		MPa	600	630	530	600	1200	240	2500
@ 100 °C		MPa	210	255	160	85	250	27	▲
Yield Strength
@ 23 °C		MPa	12,4	13,2	16	14	26	8	53-57
@ 100 °C		MPa	7,5	8,2	7	6	10	3	▲
Flexural Modulus	ASTM D790 3pt bend	MPa	▲	▲	550	580	1100	210	2100
Deformation Under Load
after 100h stress & 24h recovery	ASTM D621
@23 °C / 15 MPa		%	11	4	2	▲	▲	▲	▲
@150 °C / 8.8 MPa		%	34,5	20	10	▲	▲	▲	▲
@205 °C / 5.2 MPa		%	18,5	5,5	14,5	▲	▲	▲	▲
Hardness	ISO 868	ShD	56	59	60	57	69	54	78
Surface Roughness			0,9	0,3	0,34 (UHP grades <0,1)	0,044	▲	▲	▲
Electrical Properties
Dielectric Constant	ASTM D150 @ 1MHZ		2,1	2,1	<2,15	<2,15	2,58	4,82	▲
Dissipation Factor	ASTM D150 @ 1MHZ	10^-4	0,7	0,7	<5	<9	▲	100	▲
Dielectric Strength	ASTM D149	kV/mm	60	80	75	63	59	48	▲
			(0,20 mm film)	(0,20 mm film)	(0,25 mm film)	(0,25 mm film)	(0,25 mm film)	(0,25 mm film)
Flame Resistance
Limiting Oxygen Index	ASTM D2863	%	96	96	>95	>95	>30	>75	44
Flammability Rating	UL 94		V-0	V-0	V-0	V-0	V-0	V-0	V-0
Permeation Properties
HCl	DIN 53380 Part 4.1.2	(cm³1000µm)/(m²d*bar)
@ 23 °C			630	445	160	n/a*	190	90	▲
@ 100°C			1600	1150	1400	n/a*	2700	5600	▲
H2O (Permeation)	DIN 53122 Part 2	(g1000µm)/(m²d)
@ 23 °C			0,02	0,017	0,018	n/a*	0,11	0,17	<0,04
@ 100°C			3,5	2,43	4,54	n/a*	7,00	33,0	▲

▲ No information available
★ Mechanical properties are defined as tensile strength and percent elongation
1 Nominal value for extrusion grade resin
2 THV materials which differ in composition, melt flow index and properties