PTFE Rod Weight Calculator

Enter the diameter, length, and density of a PTFE rod into the calculator to determine its weight. The default density is set to standard virgin PTFE (2,200 kg/m³), but can be adjusted for filled grades.

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PTFE Rod Weight Formula

The weight of a PTFE rod is calculated using the standard cylinder mass formula:

W = \pi \cdot \frac{D^2}{4} \cdot L \cdot \rho

Where W is the weight, D is the rod diameter, L is the rod length, and ρ (rho) is the density of the PTFE grade being used. All dimensions must be in consistent units. For virgin PTFE, the standard density is 2,200 kg/m³ (0.0795 lb/in³ or 137.3 lb/ft³).

PTFE Rod Weight Per Foot Reference Table

The following table provides pre-calculated weights per foot for standard PTFE rod diameters using a virgin PTFE density of 0.0795 lb/in³. These values are useful for quick estimation when ordering stock lengths.

PTFE Grades and Density Variations

Not all PTFE rods weigh the same for a given size. The density of a PTFE rod depends on its grade and any filler materials added during manufacturing. Fillers are blended into PTFE to improve mechanical properties like wear resistance, compressive strength, and thermal conductivity, but they also change the material’s density and therefore its weight.

Bronze-filled PTFE rods can weigh nearly twice as much as virgin PTFE rods of the same dimensions due to the high density of the bronze filler. Carbon-filled grades, by contrast, are slightly lighter than virgin PTFE because carbon has a lower specific gravity than the base polymer.

PTFE Material Properties Relevant to Rod Applications

PTFE (polytetrafluoroethylene), commonly known by the trade name Teflon, is a fluoropolymer with a unique combination of properties that make it one of the most widely used engineering plastics for machined components. The following properties directly affect how PTFE rods are selected and used in practice.

Operating Temperature: PTFE maintains structural integrity from -260°C (-436°F) to +260°C (+500°F) in continuous service. This is the widest usable temperature range of any engineering plastic. At cryogenic temperatures, PTFE retains toughness and self-lubrication down to 5 K (-268°C). No other thermoplastic offers this combination of high and low temperature performance.

Chemical Resistance: Virgin PTFE is inert to virtually all industrial chemicals, solvents, and acids including hydrofluoric acid, aqua regia, and concentrated sulfuric acid. The only substances that attack PTFE are molten alkali metals (sodium and potassium), elemental fluorine at high temperature, and certain fluorinating agents. This makes PTFE rods the standard choice for valve stems, pump shafts, and sealing components in chemical processing environments.

Coefficient of Friction: PTFE has the lowest coefficient of friction (0.05 to 0.10 static, 0.04 dynamic) of any solid material. This property is what makes PTFE rods the preferred stock material for bushings, bearing surfaces, and slide pads in applications where lubrication is impractical or contamination from lubricants is unacceptable.

Mechanical Limitations: Virgin PTFE has relatively low tensile strength (14 to 35 MPa) and is prone to cold flow (creep) under sustained load. A PTFE rod under continuous compressive stress will slowly deform over time. This is the primary reason filled grades exist: glass and carbon fillers reduce creep by 50% or more compared to virgin material, which is critical for load-bearing applications like piston rings and flanged bushings.

Where PTFE Rod Weight Matters

Knowing the exact weight of a PTFE rod is important in several engineering and procurement contexts. In rotating equipment design, the mass of PTFE components affects dynamic balance calculations and bearing load analysis. For aerospace and defense applications, PTFE parts must meet strict weight budgets, and the difference between a virgin and bronze-filled grade can be significant at scale. In shipping and procurement, PTFE rod is typically sold by the pound or kilogram, so calculating weight from dimensions is necessary for accurate cost estimation. A 4-inch diameter virgin PTFE rod in a standard 6-foot length weighs approximately 72 lbs, while the same rod in bronze-filled PTFE would weigh roughly 130 lbs.

PTFE rods are commonly machined into seals, gaskets, valve seats, piston rings, electrical insulators, and wear strips. In the semiconductor industry, virgin PTFE is required because fillers can introduce particulate contamination. In hydraulic and pneumatic systems, glass-filled or carbon-filled PTFE is standard for piston rings and rod seals because of the improved wear life and dimensional stability under cyclic loading.

PTFE Density Compared to Other Engineering Plastics

PTFE is one of the densest common engineering plastics. The table below compares PTFE to materials that are sometimes considered as alternatives, showing why weight calculations for PTFE components can produce numbers that surprise engineers more familiar with other polymers.

A PTFE rod weighs roughly twice as much as a nylon rod of the same dimensions and more than double an UHMWPE rod. This density difference is a direct consequence of the fluorine atoms in the PTFE polymer chain, which are significantly heavier than the hydrogen and carbon atoms that make up most other thermoplastics.