Expanded PTFE Sheet

Welcome to know Expanded PTFE Sheet

Expanded PTFE sheet is a high-performance sheet gasket material made of 100% pure, multi-directionally virgin PTFE. Almost any sealing surface can be accommodated by this flexible gasket material. It is capable of handling a broad range of chemical, temperature, and pressure conditions. When compared to other PTFE products, it shows exceptional creep resistance because of its highly fibrillated microstructure.

Stark® S850 gaskets are dimensionally stable and do not expand when compressed. This property makes it possible to tightly seal narrow flange faces.

Application

Expanded PTFE sheet material complies with FDA regulations for food contact, and it is an all-purpose gasket sheet that can replace all other types of PTFE sheet. It is designed for use in process piping and equipment in chemical, pulp and paper, food and beverage, and other general industrial applications. It is suitable for use in steel flanges and flanges with irregular surfaces.

Advantages

Expanded PTFE sheet has excellent sealability, cuts easily, and separates cleanly from flanges after use. It is a long-term reliable sealing, a high-temperature, and chemical-resistant gasket.

Superior Resistance to Creep and Cold Flow

Our expanded PTFE sheet eliminates creep and cold flow with its excellent tensile strength and greater dimensional stability in both thickness and width. This characteristic leads to a more reliable seal, especially in thermal cycling and higher temperature conditions.

Soft and Conformable for Sealing Irregular Flanges

Gaskets and seals made from expanded PTFE sheet are highly soft and conformable. This allows them to compress and seal irregular sealing surfaces to create a tight, long-lasting seal. This factor also makes it an excellent choice for sealing glass-lined or plastic flanges, as it requires less bolt load.

Excellent Temperature Resistance

This gasket material offers excellent resistance to temperatures. It can be used in applications with continuous operating temperatures between -60°C and +230°C.

Exceptional Chemical Compatibility

Expanded PTFE sheet material is most commonly used for chemical processing applications. It is widely used for sealing tanks, pipes, and equipment that process or hold highly aggressive chemicals or media.

Due to the expanded ptfe sheet, it has excellent chemical resistance to all media across the entire 0–14 pH range. It is often used for sealing strong alkalis, acids, or solvents and provides a long-lasting, durable sealing solution. Exceptions are molten alkali metals and elemental fluorine.

High Tensile Strength with Good Pressure Resistance

Our expanded PTFE sheet has excellent, multidirectional tensile strength. This feature allows it to be used for sealing processes across a wide range of operating pressures.

Exceptionally Reliable Sealing Performance

It delivers a wider safety margin of seal reliability, both at installation and in operation at elevated temperatures.

Typical Properties of Expanded PTFE Sheet

Properties	Test Methods	Unit	Value
Density	ASTM D792	g/cm3	0.8
Compressibility	ASTM F36	%	45
Recovery	ASTM F36	%	14
Tensile Strength Across Grain	ASTM F152	mpa	24
Stress Retention	DIN 52913	mpa	15
Sealability (Nitrogen)	ASTM 2378	cc/min	0.01
Creep Relaxation 212°F	ASTM F38	%	30
Working temperature	-	°C	-200 to 260