A totally fluorinated polymer which is semi-crystalline, semi-opaque and white. It has outstanding chemical resistance being unaffected by almost all chemicals and also has a very high oxygen index (i.e. is inherently non-flam). It has a very low coefficient of friction and is stable to high temperatures. It is soft, easily deformed, very prone to creep and low in strength with poor radiation resistance. It is relatively expensive and cannot be melt-processed (although in theory it melts at 327C, the melt viscosity of normal grades is virtually infinite) and so is formed by powder sintering methods.
Industrial applications include bearings, seals, O-rings, high temperature electrical insulation, non-stick coatings and linings for vessels etc, etc. Its unusual properties make it invaluable for a wide range of laboratory applications.
The opaque white PTFE sphere has a ground finish and a standard tolerance. Polypropylene (PP) is a strong, lightweight plastic with a hard, smooth surface that is suitable for use where bacterial buildup could be a factor. Typically stronger, more rigid, and more resistant to higher temperatures than polyethylene, polypropylene also has good resistance to chemicals and solvents.
Plastic refers to a group of synthetic or semi-synthetic materials that have been engineered to achieve specific properties. The most notable characteristics of plastics are its low weight, machinability, corrosion resistance, and typically good thermal and electrical insulating properties. Certain plastic grades also offer optical transparency similar to glass, low-friction or self-lubricating surfaces, and exceptional impact resistance. Depending on their properties, certain plastic grades can be used as alternatives to metal, glass, and ceramic. Unlike metal, plastic may experience creep, which is deformation caused by longtime exposure to a constant load.
Tensile strength, used to indicate the material’s overall strength, is the peak stress it can withstand before it breaks. Corrosion resistance describes the material’s ability to prevent deterioration caused by atmosphere, moisture, or other medium. Wear resistance indicates the ability to prevent surface damage caused by contact with other surfaces. Toughness describes the material’s ability to absorb energy before breaking, while hardness (commonly measured as indentation hardness) describes its resistance to permanent surface deformation. Impact resistance is the measure of a material’s ability to absorb a shock of energy before breaking.
- PTFE resists most chemicals, typically withstands high temperatures, and has a low-friction, nonstick surface- PTFE generally withstands higher temperatures than other fluoropolymers, such as FEP and ETFE- Ground finish- Color is opaque white- Standard tolerance
Post time: Feb-24-2019