<unk>  is often used to coat non-stick pans as it is hydrophobic and possesses fairly high heat resistance.<unk>  is a thermoplastic polymer, which is a white solid at room temperature, with a density of about 2200 kg/m3 and a melting point of . It maintains high strength, toughness and self-lubrication at low temperatures down to , and good flexibility at temperatures above .<unk>  gains its properties from the aggregate effect of carbon-fluorine bonds, as do all fluorocarbons. The only chemicals known to affect these carbon-fluorine bonds are highly reactive metals like the alkali metals, and at higher temperatures also such metals as aluminum and magnesium, and fluorinating agents such as xenon difluoride and cobalt(III) fluoride. At temperatures above<unk>  undergoes depolymerization. Property Value Density 2200 kg/m3 Glass temperature Melting point Thermal expansion 112–125×10−6 K−1 Thermal diffusivity 0.124 mm/s Young's modulus 0.5 GPa Yield strength 23 MPa Bulk resistivity 1018 Ω·cm Coefficient of friction 0.05–0.10 Dielectric constant , Dielectric constant (60 Hz) , Dielectric strength (1 MHz) 60 MV/m Magnetic susceptibility (SI, 22 °C) −10.28×10−6 The coefficient of friction of plastics is usually measured against polished steel.<unk> 's coefficient of friction is 0.05 to 0.10, which is the third-lowest of any known solid material (aluminium magnesium boride (BAM) being the first, with a coefficient of friction of 0.02; diamond-like carbon being second-lowest at 0.05).<unk> 's resistance to van der Waals forces means that it is the only known surface to which a gecko cannot stick. In fact,<unk>  can be used to prevent insects from climbing up surfaces painted with the material.<unk>  is so slippery that insects cannot get a grip and tend to fall off. For example,<unk>  is used to prevent ants from climbing out of formicaria. Because of its superior chemical and thermal properties,<unk>  is often used as a gasket material within industries that require resistance to aggressive chemicals such as pharmaceuticals or chemical processing. However, until the 1990s,<unk>  was not known to crosslink like an elastomer, due to its chemical inertness. Therefore, it has no "memory" and is subject to creep. Because of the propensity to creep, the long-term performance of such seals is worse than for elastomers that exhibit zero, or near-zero, levels of creep. In critical applications, Belleville washers are often used to apply continuous force to<unk>  gaskets, thereby ensuring a minimal loss of performance over the lifetime of the gasket.
Polytetrafluoroethylene
Spirolactone
Polymethylsiloxane polyhydrate
Alpha-Zearalenol
Cromoglicic acid
Beta-Zearalenol
Methyl cellulose
Asthmagen