Rubber Gaskets

PTFE gaskets were specified for a section of plant that handled acid. As they ai e fragile and expensive and as an extensive series of tests using water had to be carried out during startup, temporary nitrile rubber gaskets were used during this period. You can guess what happened. One of them was left in position and corroded. 

Gases may be added above or below the liquid surface by appropriate placement of a fritted-glass gas delivery tube in a rubber gasketed adapter (Fig. A3.5). 

Figure 7 Top, ATR spectrum acquired from a reference area on the surface of the rubber gasket material and bottom, top spectral database search match. 

Polymerizations. The polymerizations were carried out in an argon atmosphere in capped glass bottles fitted with a neoprene rubber gasket inner liner. In charging the polymerizations, the order of addition of materials was solvent first, then metal alkyls, next the barium salt, and finally the monomer(s). The amount of metal alkyl charged was sufficient to titrate the acidic impurities present in the solvent and polymerization bottle, plus the calculated amount for initiation of polymerizations. The mole ratio of barium to metal alkyl(s) was based on the moles of total alkalinity of barium to the moles of carbon-metal assayed. Unless otherwise stated,... 

A series of crosslinked copolymer gels composed of DMAEMA and AAm were prepared using methylenebisacrylamide as a crosslinker for the preparation of polymer membrane. The feed compositions for the polymer membranes are listed in Tables 1 and 2. The polymerization was carried out between two Mylar sheets separated by a rubber gasket (1-mm diameter) and backed by glass plates. After polymerization, the gel was immersed in distilled water for 3 days to remove unreacted compound. The thickness of gel membrane was 1 mm in swollen state (20°C). 

The spacer material does not need to be PVC, I used it because it was transparent. You could use rubber gasket material. Just make sure it s soft so that the stack doesn t leak. Transparent silicone rubber would probably be better than PVC, but it s also a lot more expensive. Just make sure you go with 1/8" or 3mm spacing. 

Fire Bomb, M116A2, shown here on Fig 2-12, is made of sheet A1 in three sections, (8), (11) (14), joined by a seal ring (23), to which is attached synthetic rubber gaskets (22). The center section is ca 18.63 inches in diameter and 48.63-in long, open at both ends. It is braced internally by A1 girders and reinforced on the side by an A1 plate. Two suspension lugs... 

Dry Method. When Hg fulminate is sifted dry, the operation shall be performed in a location safely removed and/or shielded from other explosives, personnel or material which should be harmed by explosions. The motor of the shaking machine shall be started and stopped by a remote control switch. Assemble a No 100 sieve on a No 200 sieve and fit them on a pan. The sieves must be fitted with rubber gaskets. Place a 5g sample of dry fulminate on ihe upper sieve and shake the sieve for 3 mins on a Tyler Ro-Tap (or equal) machine. Carefully brush the material retained on the upper sieve into a weighing pan and weigh. Calculate the wt as % retained on the No 100 sieve. Brush the material passing thru the... 

Wet nitrocellulose containing 20-40% of water is packed in galvanized iron drums or in semi-hermetic wooden boxes lined with zinc sheet or sometimes only with paraffin wax paper. Rubber gaskets are fitted under the lids. The box lids are fastened down by means of brass screws. Nitrocellulose packaged in this way is accepted for railway transport in separate Waggons. 

Chemical compatibility is another important factor to reckon with in material selection as in the case of butterfly valves which are frequently used in industrial fluid flow systems where the valves are operated to load and unload different kinds of fluids for shipment or storage. These applications include tank trailers for transportation of fluids from one location to another as well as fluid flow pipelines. A typical butterfly valve usually incorporates a resilient rubber seal component which the valve pivots to seal off the flow lines and when opened allows the fluid to be conveyed to the flow line. The chemicals transported in tanks using butterfly valves are often caustic or acidic. These chemicals corrode the pivot area of the valve making its function ineffective. The rubber gasket material prevents leakage while the valve chamber is protected by a chemically resistant rubber material. 

Silicon rubber gasket electrode electrode Teflon cell Metal-film electrode... 

Aerosols can often develop a powerful sulphurous rubber smell due to the quality or age of the rubber gasket. Soaps can pick up the smell of their wrapping material such as cardboard or even the smell of a plastic container. So often these problems are blamed on the perfume, and it becomes the job of the perfumer or application chemist to identify the fault correctly. 

Higher alcohol content may cause the degradation of rubber gaskets and should be limited to under 1%. The acidity number reflects the presence of free fatty acids, which can contribute to accelerated engine aging. For the same reasons the water content should be kept quite low, at max. 300ppm. Finally, in order to ensure proper storage the oxidation stability of the fuel should be at least 5h at 110°C. 

---