Fluoropolymer Properties , Fluoropolymer Properties

Fluoropolymer Properties

Item		Unit	ASTM Test Method	PTFE(4F)	PFA	PCTFE (3F)	PVDF (2F)	FEP (4-6F)	PEEK
Physical Properties	Density		D792	2.14~2.20	2.12~2.17	2.1~2.2	1.75~2.17	2.12~2.17	1.31
	Melting Point	oC		327	302~310	210~212	170	253~282	340
	Tensile Strength	Kg/cm2	D638	280~350	320	315~420	400~520	200~320	1142
	Elongation	%	D638	200~400	280~300	80~250	100~300	250~330	20
	Compression Strength	Kg/cm2	D695	120	-	320~520	600	150
	Impact Strength	Kg*cm/cm	D256	16.3	Not Damaged	13.6~14.7	19.6~21.8	Not Damaged	Not Damaged
	Hardness	Rockwell Hardness	D782	R25	-	R75~95	R100~115	R25	R126
	Hardness	Shore Hardness	D1706	D55	D60	D90	D80	D55	D85
	Static Friction Coefficient		-	0.05	-	0.25	0.10	.
	Kinetic Friction Coefficient		-	0.10	0.2	0.37	0.39	0.3	0.4
Thermal Properties	Heat Conductivity	10-4 cal/cm. sec.oC	C117	5.9	6.2	4.7~5.3	3.0	6.0
	Coefficient of Linear Expansion	10-5 /oC	D696	9.9(23~66oC)	12(21~100oC)	4.5~7.0	8.5	8.3~10.5(-73~71oC)
	Operating Temperature	oC		260	260	150~180	150	200	300
Electrical  Properties	Volume Resistibility	.cm	D257	>1018	>1018	12*1018	20*1014	>1018
	Surface Resistibility		D257	>1016	>1016	-	-	>1016	>1013
	Insulation Resistibility	1/8” thick Kv/mm	D149	16~24	20~24	20~24	10.4	20~24	24
Durability	Chemical Resistance		D543	Excellent	Excellent	Good	Good	Excellent	Good
	Flammability	%	D635	Non-Flammable	Non-Flammable	Non-Flammable	自行消化	Non-Flammable	Flame Resistant
	Permeability	%	D570	<0.01	0.03	0.00	0.04	<0.01	0.10

Note : PEEK is not a Fluropolymer, it is listed only for comparison purposes under high pressure and temperature operating environment.

Types of Fluoropolymers and Chemical Resistance Comparison

Category (Name) Molecule Structure (Fluorine per molecule) Melting Point and Operating Temperature Chemical Resistance PTFE m.p. 327oC W.TEMP(MAX) 260oC Excellent chemical stability; PTFE does not interact with the vast majority of chemicals and solvents. However, it is vulnerable to molten alkali metal. PTFE also interacts with fluorine gas and fluorine compounds, such as CIF3. OF2, under high temperature and high pressure environments ETFE m.p. 270oC W.TEMP(MAX) 150oC Similar to the chemical resistance of PTFE, but easily corroded by nitric acids. Has chemical resistance on par with PTFE, but easily corroded by certain chemicals such as nitric acid. PCTFE m.p. 327oC W.TEMP(MAX) 260oC Highly crystalline, high polymer material, with superior permeability properties.  PFA m.p. 327oC W.TEMP(MAX) 260oC Similar to the chemical resistance of PTFE, with superior mechanical and sanitary properties. FEP m.p. 327oC W.TEMP(MAX) 260oC Similar to the chemical resistance of PTFE, but has slightly lower operating temperature. PVDF m.p. 327oC W.TEMP(MAX) 260oC Easily dissolved by fuming sulfuric acid, high temperature sulfuric acid, or caustic soda above 100oC; also bloats or dissolves when interacting with strong solvents such as aceton、ketone、DMA, or extremely alkalic primary amine such as n-butylamine.