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O-ring materials may be subjected to high or low temperatures, chemical attack, vibration, abrasion, and movement. Elastomers are selected according to the situation. There are O-ring materials which can tolerate temperatures as low as −330 °F (−200 °C) or as high as 480 °F (250 °C).
Certain grades have a maximum continuous service temperature of 327 °C (621 °F). They are commonly used to make O-rings and gaskets that are used in applications that involve contact with hydrocarbons or highly corrosive fluids, or when a wide range of temperatures is encountered.
The automotive industry represents their main application sector, where constant reach for higher efficiencies push manufacturers towards high-performing materials. [15] An example are FKM o-rings used as an upgrade to the original neoprene seals on Corvair pushrod tubes that deteriorated under the high heat produced by the engine, allowing oil ...
Washers are manufactured as a continuous ring with no breaks. [9] Indium material used must be ultra-pure (99.9 minimum purity) to prevent hardening of the material at sub-zero temperatures, as well as to restrict impurities of elements with low vapor-pressure. [13] Using vacuum-cast materials for indium cryogenic seals can prevent outgassing.
A1: This varies widely by O-ring material and joint design, and also depends (as you might expect) on the lifespan during which you need the O-ring to seal. For common O-ring elastomers, max temps may be expected to be between 100 and 200 degC, with max pressures between 500 and 5000 kPa. Unclben 23:53, 29 October 2006 (UTC)
A taper-joint stopper with PTFE Sealing Ring. Optical transparency of the narrow sealing ring pressured by glass joint (right). Glass taper joints can be sealed hermetically with PTFE sealing rings (high vacuum tight, air leakage rate 10 −6 mBar × L/sec and below), [ 6 ] o-rings (optionally encapsulated o-rings), or PTFE sleeves, [ 7 ...
It is used to create weatherstripping, seals on doors for refrigerators and freezers (where it also acts as an insulator), face masks for industrial respirators, glass run channels, radiators, garden and appliance hose (where it is used as a hose material as well as for gaskets), tubing, washers, O-rings, electrical insulation, and geomembranes.
Additionally, the O-rings were not resilient at low temperatures like those of the January 1986 morning of the accident (36 °F; 2.2 °C). A cold-compromised joint in the right SRB failed at launch and allowed hot gases from within that rocket booster to sear a hole into the adjacent main external fuel tank and also weaken the lower strut ...
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