What is PTFE?
PTFE or Polytetrafluoroethylene is a fluoropolymer having unique properties that makes it often the choice for most demanding engineering applications. Some of its outstanding properties are
- Low coefficient of friction
- Low dielectric constant
- Outstanding chemical resistance
- Wide temperature range
- High dielectric strength
- Excellent weather ability
- Excellent flammability resistance
- High volume surface resistivity
What is a PTFE compound?
Some of the drawbacks with PTFE are high deformation under load , high thermal expansion , low hardness, and low wear resistance. PTFE compounds have been introduced to address some of the above deficiencies with virgin PTFE.
Fillers are blended with PTFE to obtain PTFE compounds. Fluoroflon Industry employs Fillers like Bronze, Carbon, Graphite, Glass fiber, Stainless steel, Molybdenum sulphide etc for blending with PTFE. Addition of these fillers improve wear resistance , increases compressive strength, increases electrical conductivity, increases hardness.
What is the role of fillers in PTFE?
Addition of filler to Virgin PTFE enhances its properties in many ways.
Fillers increase the hardness of PTFE and reduce Creep
Fillers reduce the linear coefficient of thermal expansion and contraction of compounds
Generally they significantly increase the porosity of PTFE , drop the dielectric Strength and raise the dielectric constant and dissipation factor.
Fillers increase the permeability of PTFE . In general , chemical resistance of filled PTFE compounds are not as good as those of unfilled compounds.
Wear rate is reduced
How are PTFE Compounds processed ?
PTFE has very high molecular weight and also has very melt viscosity above its crystalline melting point making non melt processable. It cannot be processed like conventional thermoplastics. Powder metallurgy techniques are employed in Processing of PTFE compounds.
What type of PTFE Compounds are available with Fluoroflon Industry ?
Fluoroflon Industry manufactures PTFE compounds in three forms namely
- Low flow ( non free flow)
- Free flow ( free flow)
- Pre sintered Grade ( extrusion grade)
How are PTFE Compounds Processed ?
Different forms of PTFE compounds have different methods of processing.
Standard flow or low flow compounds are processed by compression molding and then sintering. The product is subsequently machined to obtain desired geometrical shape.
Free flow compounds are isostatically molded and sintered . Normally recommended for thin walled bushes and tubes.
Pre sintered grades are processed by ram extrusion.
What is the continuous service temperature of PTFE Compounds ?
The recommended service temperature of PTFE compounds is -260 deg C to + 260 deg C. depending on load.
What are Modified PTFE compounds?
Fluoroflon Industry also makes modified PTFE compounds using modified PTFE as base resin. The modified PTFE resins have substantially lower deformation under load then conventional PTFE compounds
What standards PTFE Compounds comply with ?
PTFE Compounds manufactured by Fluoroflon Industry complies with ATM D4745 Specification for Filled Compounds of PTFE molding and extrusion grades.
Does Fluoroflon Industry gives any Technical support ?
Fluoroflon Industry gives utmost importance in providing technical support for our existing and new customers based on their end application.