Engineering plastic material properties

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Especificación técnica PTFE

Especificación Técnica de PTFE: Propiedades del Fluoropolímero

Item		Unit	ASTM Test Method	PTFE (4F)	PFA	PCTFE (3F)	PVDF (2F)	FEP (4-6F)	PEEK
Physical Properites	Density		D792	2.14~2.2	2.12~2.17	2.1~22	1.75~2.17	2.12~2.17	1.31
Physical Properites	Melting Point	^oC		327	302~310	210~212	170	253~282	340
Mechanical Properties	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		D55	D85
	Static Friction Coefficient		--	0.05	--	0.25	D80	--
	Kinetic Friction Coefficient		--	0.1	0.2	0.37	0.1	0.3	0.4
Heat Properties	Heat Conductivity	10⁴cal/cm.sec. ^oC	C117	5.9	6.2	4.7~5.3	0.39	6
	Coefficient of Linear Expansion	10⁶/^oC	D696	9.9(23~66^oC)	12(21~100^oC	4.5~7.0	3	8.3~10.5(-17~71^oC)
	Operating Temperature	^oC		260	260	150~180	8.5	200	300
Electrical Properties	Volume Resistivity	.cm	D257	>10¹⁸	>10¹⁸	12*10¹⁸	150	>10¹⁸
	Surface Resistivity		D257	>10¹⁶	>10¹⁶	--	20*10¹⁴	>10¹⁶	>10¹³
	Insulation Resistivity	1/8" thick Kv/mm	D149	16~4	20~24	20~24	--	20~24	24
Durability	Chemical Resistance		D543	Excellent	Excellent	Good	Good	Excellent	Good
	Flammability	%	D635	Non-Flammable	Non-Flammable	Non-Flammable	Self-Digested	Non-Flammable	Flame Resistant
	Permeability	%	D570	<0.01	0.03	0	0.04	<0.01	0.1

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

Comparación de tipos de Fluoropolímeros y Resistencia Química

Category (Name)	Molecule Structure (Fluorine per molecule)	Melting Point and Operating Temperature	Chemical Resistance
PTFE		m.p. 327^oC W.TEMP(MAX) 260^oC	Excellent chemical stability; PTFE don't 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. 270^oC W.TEMP(MAX) 150^oC	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.
ECTFE		m.p. 240^oC W.TEMP(MAX) 150^oC	Highly crystalline, high polymer material, with superior permeability properties.
PFA		m.p. 302~310^oC W.TEMP(MAX) 260^oC	Similar to the chemical resistance of PTFE, with superior mechanical and sanitary properties.
FEP		m.p. 253~282^oC W.TEMP(MAX) 160^oC	Similar to the chemical resistance of PTFE, but has slightly lower operating temperature.
PVDF		m.p. 170^oC W.TEMP(MAX) 130~150^oC	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, acetamide or extremely alkalic primary amine such as n-butylamine.