Elastomer O-rings

We have seen that several kinds of gaskets are used with the various types of flanges. For low and high vacuum at room temperature, elastomers O-rings (rubber, ethylenpropylen, silicon etc.) are used. Small pressures of flanges are needed. The maximum bakeout... 

Notes 1) Elastomer o-rings are not permitted in hydrocarbon service. 2) Slip-on figs. Reauire Pureh. J proval. Combination pack shall consist of four (4) demister... 

Figure 4.2-3 shows the variable-volume view-cell. This cell is used as a general purpose mixing vessel, reservoir and reactor, depending on the particular reaction under study. It has a piston sealed with an elastomer O-ring, which can be moved by applying a pressure of CO2. The original version of this... 

Adsorption can be enhanced in vapour mixtures. Pavlychenko reports that the adsorption of mixtures of acetone and chloroform on graphitized carbon black is substantially greater than that of either of the pure components. Absorption of organic vapours can also be significant in elastomers. O-rings... 

All of the O-rings were of WS1.957 type according to TGL 106-70101. They were initially manufactured from nitrile butadiene caoutchouc (rubber). Although results are given in [221] which provide evidence that this material can be used in the required range of temperatures and pressures, these elastomer O-rings have been replaced with Viton MK 634 seals (from Merkel/GNB) based on experience with transporting CASTOR containers. 

FIGURE 4.2 Retained sealing force of FKM versus other elastomer O-rings. 

Fig e 11.19 The Xe NMR spectra of a series of fluorosilicone elastomer o-rings that have been exposed to increasing levels of long-term compressive force. The increasing loss of the free Xe signal and the shifts in the sorbed Xe signal correlate clearly with a large reduction in void volume associated with the onset severe compression set. 

---