Virgin PTFE round rod material small diameter variety Pack, 12 inch lengths: diameter/8", 3/16", 1/4", 5/16", 3/8 inch included in this Pack by Sterling seal & supply, Inc (stucco), uses: plastic Dowel, axels, arts & crafts (Pack of 5). Sterling seal & supply PTFE rod (polytetrafluoroethylene) is a high molecular weight polymer and one of the most versatile plastics known to Man virgin PTFE sheet can handle virtually all chemicals in the 0-14 pH range with the exception of molten alkali metals and elemental fluorine it is suitable for service at temperatures from the cryogenic range up to 500 Degrees F PTFE rod is particularly recommended for applications in the food and beverage industry where high purity materials are required it is also used where contamination or discoloration of flow media cannot be tolerated the coefficient of friction of plastics is usually measured against polished steel ptfe's resistance to van and commercial Waals forces means that it is the only known surface to which a gecko cannot stick in fact, PTFE can be used to prevent insects climbing up surfaces painted with the material and is so slippery.