DuPont™ Teflon® PFA 340
fluoropolymer resin
Extrusion and Molding Resin

通用级：挤出和注塑成型的树脂.最高流量.最低分子量.
应   用：管注射或吹塑文章化学衬(储罐,管道,阀门,泵)

Brand
Teflon® is a registered trademark of DuPont for its brand of fluoropolymer resins, which can only be licensed by DuPont for use in approved applica-tions. Customers who wish to use the Teflon® trade-mark in connection with DuPont PFA products under license from DuPont should contact (86)13662986968. Without a license, customers may not identify their product as containing Teflon®, but may refer to the resin as PFA 340.

Description
DuPont™ Teflon® PFA 340 is a general-purpose resin available in clear, 2.5-mm (0.1-in.) pellets. Compared with other grades of Teflon® PFA, its most unique features are a relatively high flow rate and properties that make it suitable for a variety of processes and demanding end uses.

Teflon® PFA 340 and the other Teflon® PFA (perfluoroalkoxy) fluoropolymer resins combine the processing ease of conventional thermoplastics with properties similar to those of polytetrafluoro-ethylene. They have high melt strength, stability at high processing temperatures, and resistance to creep at high service temperature.

Teflon® PFA 340 is used when traditional extrusion and molding processes are required for producing products with the superior properties of a fluoro-polymer resin. For a given process, its high melt strength and thermal stability can be used to im-prove rates. Compared with other fluoropolymers, its creep resistance at its high service temperatures provides a superior balance and level of end-use properties.

Properly processed products made from neat Teflon® PFA 340 resin provide the superior proper-ties typical of the fluoropolymer resins: retention of properties after service at 260°C (500°F), useful properties at –196°C (–320°F), and chemical inert-ness to nearly all industrial chemicals and solvents. Dielectric constant and dissipation factor are excep-tionally low. Molded products have moderate stiff-ness and high ultimate elongation.

In a flame situation, products of Teflon® PFA 340 resist ignition and do not themselves promote flame spread. When ignited by flame from other sources, their contribution of heat is small and with very little smoke.

Statements, or data, regarding behavior in a flame situation are not intended to reflect hazards pre-sented by this or any other material when under actual fire conditions.

Typical End Products
Applications for Teflon® PFA 340 include extruded tubing and other profiles for hose, electrical insula-tors, and sleeving; industrial film; and injection-molded articles requiring superior electrical, chemical, and thermal properties.

Processing
Teflon® PFA 340 can be processed by conventional melt extrusion and by injection, compression, and transfer processes. High melt strength and heat stability permit the use of relatively large die openings and high-temperature draw-down tech-niques that increase production rates. Reciprocating screw injection-molding machines are preferred. Corrosion-resistant metals should be used in contact with molten resin. Extruder barrels should be long, relative to diameter, to provide residence time for heating the resin to approximately 390°C (730°F).

Table 1
Typical Property Data for DuPont™ Teflon® PFA Fluoropolymer Resin Grade 340

Property		ASTM Test Method	Unit	Nominal Value
Thermal	Nominal Melting Point	D3418	℃	302-310
			(℉)	(575–590)
	Coefficient of Linear Thermal Expansion,	-
	21-100℃	D696	mm/mm/℃	14x10-5
	(70-212℉)	-	(in./in./℉)	(7.6x10-5)
	100-149℃	-	mm/mm/℃	17x10-5
	(212-300℉)	-	(in./in./℉)	(9.2x10-5)
	149-208℃	-	mm/mm/℃	21x10-5
	(300-408℉)	-	(in./in./℉)	(11.5x10-5)
	Upper Service Temperature	-	℃	260
			(℉)	500
	Flow Rate	D3307	g/10 min	14
Mechanical	Tensile Strength, 23℃(73℉)	D3307	MPa(psi)	25(3,600)
	250℃(482℉)		MPa(psi)	12(1,800)
	Specific Gravity	D792	-	2.12-2.17
	Tensile Yield Strength, 23℃(73℉)	D3307	MPa(psi)	13.8(2,000)
	Ultimate Elongation, 23℃(73℉)	D3307	%	300
	250℃(482℉)		%	480
	Flexural Modulus, 23℃(73℉)	D790	MPa(psi)	590(85,000)
	250℃(482℉)		MPa(psi)	55(8,000)
	Hardness Durometer	D2240	-	D55
	MIT Folding Endurance 0.18-0.20mm(0.007-0.008 in.)	D2176	cycles	15,000*
Electrical	Dielectric Strength Short Time,0.25 mm(0.010 in.)	D149	kV/mm(V/mil)	80(2,000)
	Dielectric Constant, 60-106 Hz	D150	-	2.03
	Dissipation Factor, 60-106 Hz	D150	-	0.0001
	Volume Resistivity	D257	ohm.cm	1018
General	Water Absorption, 24 hr	D570	%	<0.03
	Weather and Chemical Resistance	-	-	Outstanding
	Limiting Oxygen Index	D2863	%	>95
Note: Typical properties are not suitable for specification. * Depending on fabrication conditions

Safety Precautions
WARNING!
VAPORS CAN BE LIBERATED THAT MAY BE HAZARDOUS IF INHALED.
Before using Teflon® PFA 340, read the Material Safety Data Sheet and the detailed information in the “Guide to the Safe Handling of Fluoropolymer Resins,” latest edition, published by the Fluoro-polymers Division of The Society of the Plastics Industry—available from DuPont.

Open and use containers only in well-ventilated areas using local exhaust ventilation (LEV). Vapors and fumes liberated during hot processing, or from smoking tobacco or cigarettes contaminated with Teflon® PFA 340, may cause flu-like symptoms (chills, fever, sore throat) that may not occur until several hours after exposure and typically pass within about 24 hours. Vapors and fumes liberated during hot processing should be exhausted com-pletely from the work area; contamination of tobacco with polymers should be avoided.

Mixtures with some finely divided metals, such as magnesium or aluminum, can be flammable or explosive under some conditions.

Storage and Handling
The properties of Teflon® PFA 340 resins are not affected by storage time. Ambient storage conditions should be designed to avoid airborne contamination and water condensation on the resin when it is re-moved from containers.

Freight Classification
Teflon® PFA 340 is classified as “Plastics, Materials, Granules.”

Packaging
Teflon® PFA 340 is packaged in 24.9-kg (55-lb) bags with a polyethylene inner lining. Special pack-ages containing 2.3 kg (5 lb) and 11.3 kg (25 lb) are also available.

PFA:http://www.pa66-suliao.com/product/gcsuliao/PFA/