DuPont™ Teflon PFA 350
fluoropolymer resin
Extrusion and Molding Resin

General Purpose：High molecular weight resin with highest resistance to stress cracking. Lowest flow rate of this series of resins for extrusion and transfer molding.
Applications：1、Films 2、Chemical tank linings 3、Molded articles 4、Tubing

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 350.

Description
DuPont ™ Teflon® PFA 350 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 low flow rate, greatly increased flex life, and enhanced resistance to environmental stress cracking.

Teflon® PFA 350 and the other Teflon® PFA (perfluoroalkoxy) fluoropolymer resins combine theprocessing ease of conventional thermoplastics with properties similar to those of polytetrafluoro-ethylene (PTFE). They have high melt strength, stability at high processing temperatures, and resistance to creep at high service temperature.

Teflon® PFA 350 is preferred when extended service is required in hostile environments involving chemi-cal, thermal, and mechanical stress. For a given process, its high melt strength and thermal stability can be used to improve rates. Compared with other fluoropolymers, its creep resistance at its high ser-vice temperatures provides a superior balance and level of end-use properties.

Properly processed products made from neat Teflon® PFA 350 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 350 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 350 include extruded tubing in hose for handling aggressive fluids at high pressures; chemical linings for pipes, valves, and fittings used in the chemical processing industries; film for high flex service; traditional extruded injec-tion or blow-molded articles requiring the unique performance of Teflon® PFA 350.

Processing
Teflon® PFA 350 can be processed by conventional melt extrusion and by injection, compression, and transfer and blow-molding processes. High melt strength and heat stability permit the use of rela-tively large die openings and high-temperature draw-down techniques that increase production rates. Reciprocating screw injection molding ma-chines are preferred. Corrosion-resistant metals should be used in contact with molten resin. Ex-truder barrels should be long, relative to diameter, to provide residence time for heating the resin to approximately 395°C (730°F).

Table 1
Typical Property Data for DuPont™ Teflon® PFA Fluoropolymer Resin Grade 350

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./℉)	(7.8x10-5)
	100-149℃	-	mm/mm/℃	18x10-5
	(212-300℉)	-	(in./in./℉)	(9.8x10-5)
	149-208℃	-	mm/mm/℃	22x10-5
	(300-408℉)	-	(in./in./℉)	(12.1x10-5)
	Upper Service Temperature	-	℃	260
			(℉)	(500)
	Flow Rate	D3307	g/10 min	2.0
Mechanical	Tensile Strength, 23℃(73℉)	D3307	MPa (psi)	28 (4,00)
	250℃(482℉)		MPa (psi)	14 (2,00)
	Specific Gravity	D792	-	2.12-2.17
	Tensile Yield Strength, 23℃(73℉)	D3307	MPa (psi)	15.2 (2,200)
	Ultimate Elongation, 23℃(73℉)	D3307	%	300
	250℃(482℉)		%	500
	Flexural Modulus, 23℃(73℉)	D790	MPa (psi)	625 (90,000)
	250℃(482℉)		MPa (psi)	69 (10,000)
	Hardness Durometer	D2240	-	D55
	MIT Folding Endurance 0.18-0.20mm(0.007-0.008 in.)	D2176	cycles	500,000*
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
*Depending on fabrication conditions Note: Typical properties are not suitable for specification purposes. Teflon® PFA 350 is ASTM D3307, Type II.

Safety Precautions
WARNING!
VAPORS CAN BE LIBERATED THAT MAY BE HAZARDOUS IF INHALED.
Before using Teflon® PFA 350, 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 350, 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 350 resin 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 350 is classified as “Plastics, Materials, Granules.”

Packaging
Teflon® PFA 350 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