Master Lock 2300D pen oiler lock lubricant with PTFE. Over time, airborne dust, dirt, and chemicals can settle on and in locks and create friction inside the precision locking and keying components, thus interfering with the function. Locks must be maintained to keep them functioning properly and lengthen the product life. This is the ideal lubricant formulated specifically for locks. What is PTFE? PTFE is the acronym for Polytetrafluoroethylene, which is the most slippery material known to science today. All surfaces have microscopic irregularities, which create friction when rubbed against each other. The introduction of PTFE into these irregularities smoothes out the surfaces, reducing the wear and sticking that friction causes. The most familiar name of PTFE is Teflon, which is the registered trademark for DuPonts non-stick cookware. Where can the new lock lubricant be used? Everywhere. This formulation is ideal for padlocks, door locks, automotive, marine, and multipurpose applications. The 2300D pen oiler is convenient for consumers and can easily be applied to keyways or shackle holes.