PTFE rods and tubes

Product Information

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VIRGIN PTFE

The most outstanding characteristics of pure PTFE are:

• Wide temperature working range, from -200 ºC to +260 ºC, with high viscosity at temperatures up to +273 ºC.
• High corrosion resistance, making it ideal for aggressive environments.
• Non-stick property, making it a perfect material for applications where adhesion of substances needs to be prevented.
• High dielectric properties, making it suitable for electrical and electronic applications.
• Low coefficient of friction, ideal for sliding and low-friction applications.
• Non-toxic / Inert.
• Non-toxic and inert, ensuring its safety in contact with food and pharmaceutical products.

For this reason, PTFE is essential in numerous industries. Some examples of its applications include the manufacturing of PTFE bellows for the fine chemical sector, mechanical seals in the petrochemical industry, gaskets and parts for the pharmaceutical sector, valves for the hydraulic industry, as well as non-stick applications in the food industry, packaging, and industrial paints, among others.

However, in certain specific applications, the properties of virgin PTFE may require additional enhancements. This is achieved by adding fillers to the material, which can optimize characteristics such as mechanical, thermal, or electrical resistance. At MEREFSA, we are available to advise you on the type of filler that best suits your needs and particular applications.

PTFE and its charges

CARBON CHARGED PTFE:

This additive is commonly incorporated at 25% of the material, improving several key properties. It increases wear resistance, making it self-lubricating and reducing load-induced deformation. Additionally, it enhances thermal conductivity while maintaining unaltered chemical resistance. However, the dielectric properties of PTFE are substantially modified.

Applications: Ideal for applications that require high wear resistance under high pressure, such as piston rings for non-lubricated compressors and bearings.

GLASS FIBER CHARGED PTFE:

PTFE is typically filled with 25% fiberglass, which improves wear resistance and, to a lesser extent, reduces load-induced deformation. This filler maintains the electrical and chemical properties of the material unchanged, although it may cause some abrasion due to the presence of fiberglass.
Applications: It is the most commonly used filler in gaskets that experience rotation and movement, such as pneumatic systems, hydraulics, bearings, and more.

STAINLESS STEEL CHARGED PTFE:

This filler improves compression resistance and provides low permeability, making the material more resistant and durable under high-pressure conditions.
Applications: Ideal for applications that require high compression and chemical resistance, such as in industrial environments where aggressive substances are handled.

BRONZE CHARGED PTFE:

This additive is incorporated in a percentage ranging from 40% to 60%. The combination of PTFE with bronze provides excellent wear resistance, notable resistance to load-induced deformation, and good thermal conductivity. However, this filler has low chemical resistance and reduced dielectric properties.
Applications: Ideal for dynamic seals where high wear resistance under high compression conditions is required, but where chemical resistance is not a priority.

The quality control of the PTFE

The quality of PTFE is determined by several key factors, including:

• Density: It has a density of 2.17 gr/cm³. If the surface shows roughness, it is indicative of low-quality PTFE, as it was not properly compressed during manufacturing.
• Tensile strength: It is a memoryless material, meaning it should not show pores or cracks. These defects affect its strength and durability.
• Impurities or stains: The presence of impurities or stains on rods or tubes is a sign of contamination during the manufacturing process, which negatively impacts its properties and quality.

STOCK OF PTFE BARS / DOLLS AND TUBES

Our stock is in a warehouse exclusively dedicated to mechanization. Its storage is perfectly sectorized and updated by software in real time, which allows us to provide a sales service of semi-finished products, PTFE bars and tubes, instantaneously and delivery times in our most competitive mechanized product in the sector. We have, among others, the following materials:

✓ Extruded PTFE BAR with a diameter of 8 mm up to 200 mm.
✓ Molded PTFE BAR / DOLL.
✓ Molded PTFE BAR / DOLL with charge (15% or 25% Carbon or Fiberglass).
✓ Molded PTFE BAR / DOLL with charge (40% Bronze, 60% Bronze).

Images

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