PTFE (Polytetrafluoroethylene), commonly known as "Plastic King", is a high-performance special engineering plastic with a fully fluorinated structure. Its molecular chain is composed of carbon-fluorine bonds, with high base density among thermoplastics. Core advantages include unparalleled chemical corrosion resistance, excellent heat resistance, extremely low friction coefficient, and outstanding electrical insulation performance, along with good weather resistance and non-stickiness, almost insoluble in any organic solvent, making it the preferred material for special working conditions in chemical, mechanical, electronic, and medical fields. The density fluctuation of PTFE mainly comes from the filling system and modification process. Different types and modified versions of PTFE have obvious density variations. Accurate grasp of its density parameters is the core of the design and process optimization of sealing, wear-resistant, and anti-corrosion components under special working conditions.
General-purpose pure PTFE: 2.14–2.20 g/cm³, typical value 2.16 g/cm³. The fully fluorinated structure gives it extreme chemical resistance and non-stickiness, with stable density, suitable for various basic anti-corrosion and sealing scenarios.
Glass fiber filled PTFE: 2.15–2.30 g/cm³. Glass fiber content is positively correlated with density. The core is to improve the material's wear resistance, dimensional stability, and creep resistance, suitable for medium and high-load friction working conditions.
Carbon fiber/graphite filled PTFE: 2.10–2.25 g/cm³. Filling content is positively correlated with density. The core is to improve wear resistance, self-lubrication, and thermal conductivity, suitable for high-speed, oil-free lubrication precision friction components.
Bronze filled PTFE: 2.40–3.00 g/cm³. Bronze powder filling significantly increases density, mainly improving the material's thermal conductivity, load-bearing capacity, and wear resistance, suitable for heavy-load, high-temperature friction working conditions.
Anti-static/conductive PTFE: 2.15–2.30 g/cm³. Modified by adding conductive fillers, density is slightly higher than pure PTFE, mainly endowing the material with anti-static and conductive properties, suitable for electronic and semiconductor special scenarios.
Modified wear-resistant PTFE: 2.15–2.35 g/cm³. Modified by compounding multiple wear-resistant fillers, density increases slightly, mainly enhancing wear resistance and creep resistance, suitable for long-life, high-frequency friction components.
This density parameter is the core basis for the design of special working condition products such as chemical anti-corrosion equipment, mechanical seals, bearing cages, electronic insulation components, and medical implant devices. The fully fluorinated structure and stable density range ensure precise dimensional matching under extreme working conditions of strong chemical corrosion, high-low temperature cycles, and high-frequency friction. Density calculation is not only the key to product weight control and mold design but also the core data for special molding process (such as compression molding, ram extrusion) parameter setting and assembly gap matching, while supporting the full play of its core characteristics of chemical resistance, low friction, and non-stickiness.
