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 Teflon PTFE Sheet Rod
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Jual Teflon PTFE Sheet Rod



Spesifikasi Teflon PTFE Sheet Rod

Polytetrafluoroethylene (PTFE) is a synthetic fluoropolymer of tetrafluoroethylene that has numerous applications. The best known brand name of PTFE-based formulas is Teflon by DuPont Co., which discovered the compound. PTFE is a fluorocarbon solid, as it is a high-molecular-weight compound consisting wholly of carbon and fluorine. PTFE is hydrophobic: neither water nor water-containing substances wet PTFE, as fluorocarbons demonstrate mitigated London dispersion forces due to the high electronegativity of fluorine. PTFE has one of the lowest coefficients of friction of any solid. PTFE is used as a non-stick coating for pans and other cookware. It is very non-reactive, partly because of the strength of carbon–fluorine bonds, and so it is often used in containers and pipework for reactive and corrosive chemicals. Where used as a lubricant, PTFE reduces friction, wear and energy consumption of machinery. It is also commonly used as a graft material in surgical interventions. Production PTFE is produced by free-radical polymerization of tetrafluoroethylene. The net equation is: n F2C=CF2 → 1/n —{ F2C—CF2}n— Because tetrafluoroethylene can explosively decompose to tetrafluoromethane and carbon, special apparatus is required for the polymerization to prevent hot spots that might initiate this dangerous side reaction. The process is typically initiated with persulfate, which homolyzes to generate sulfate radicals: [O3SO-OSO3]2−⇌ 2 SO4•− The resulting polymer is terminated with sulfate ester groups, which can be hydrolyzed to give OH-end-groups.[16] Because PTFE is poorly soluble in almost all solvents, the polymerization is conducted as an emulsion in water. This process gives a suspension of polymer particles. Alternatively, the polymerization is conducted using a surfactant such as PFOS. Properties PTFE is often used to coat non-stick pans as it is hydrophobic and possesses fairly high heat resistance. "Amazing New Concept in Cooking" PTFE is a thermoplastic polymer, which is a white solid at room temperature, with a density of about 2200 kg/m3. According to DuPont, its melting point is 600 K (327 °C; 620 °F).[17] It maintains high strength, toughness and self-lubrication at low temperatures down to 5 K (−268.15 °C; −450.67 °F), and good flexibility at temperatures above 194 K (−79 °C; −110 °F).[18] PTFE 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 aluminium and magnesium, and fluorinating agents such as xenon difluoride and cobalt(III) fluoride.[19] Property Value Density 2200 kg/m3 Melting point 600 K Thermal expansion 112–125 • 10−6 K−1 [20] Thermal diffusivity 0.124 mm2/s [21] Young's modulus 0.5 GPa Yield strength 23 MPa Bulk resistivity 1016 Ω•m [22] Coefficient of friction 0.05–0.10 Dielectric constant ε = 2.1, tan(δ) < 5(-4) Dielectric constant (60 Hz) ε = 2.1, tan(δ) < 2(-4) Dielectric strength (1 MHz) 60 MV/m The coefficient of friction of plastics is usually measured against polished steel.[23] PTFE's coefficient of friction is 0.05 to 0.10,[17] which is the third-lowest of any known solid material (BAM being the first, with a coefficient of friction of 0.02; diamond-like carbon being second-lowest at 0.05). PTFE's resistance to van der Waals forces means that it is the only known surface to which a gecko cannot stick.[24] In fact, PTFE can be used to prevent insects climbing up surfaces painted with the material. PTFE is so slippery that insects cannot get a grip and tend to fall off. For example, PTFE is used to prevent ants climbing out of formicaria. Because of its chemical inertness, PTFE cannot be cross-linked like an elastomer. Therefore, it has no "memory" and is subject to creep. Because of its superior chemical and thermal properties, PTFE is often used as a gasket material. However, because of the propensity to creep, the long-term performance of such seals is worse than for elastomers which exhibit zero, or near-zero, levels of creep. In critical applications, Belleville washers are often used to apply continuous force to PTFE gaskets, ensuring a minimal loss of performance over the lifetime of the gasket.[25]

 

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