Rubber disk

NOTE Gun barrel is slightly less than 3/4 inch in diameter. U rubber disk does not fit in barrel, file or trim It very slightly. It should fit tightly. 

Push end of push-rod without the rubber disk into hole in wooden block fastened to grenade. 

After the holes are drilled and the rod is threaded, simply screw the standoff onto the threaded piston rod after applying a little silicone or epoxy glue. Punch a 34" diameter silicone rubber disk from a 3/32n thick piece and glue this onto the end of the standoff. This is the gasket-seal for the oxygen outlet. 

Headspace volatile compounds were collected by using a SPME (Supelco Co., Bellefonte, PA) fiber coated with Carboxen-poly(dimethylsiloxane) (75 pm thickness, 10 mm length). Samples were ground with a scalpel and 2 g were weighed into 5-mL (actual volume) screw-capped vials. Vials were tightly stoppered with hole-caps with a Teflon-rubber disk. For extraction, vials were hold at 30 C in a water bath, and the fiber was inserted into the vials and exposed to headspace for 30 min. Sample order was randomized. 

Around the needle tips, 1/4-inch diameter, 1/16-inch thick rubber disks have been placed. By providing a seal for the placenta around the base of the needles, they prevent the short circuiting of the perfusion fluid and also, by slightly lifting the placenta above the surface, they permit an easier venous return through the other 37 holes flush with the uterine surface which serve as venous outlets. The return flow proceeds through polyethylene tubes to the venous compartment of the manifold. 

FigJ.16 Solid membrane flow-through ion-selective electrode. A, threaded cylinder for flxing solid membrane B, main block with inlet and outlet SI, silicone rubber disk with hole in centre S2, silicone rubber disk with slot which forms the flow path M, solid membrane D. copper contact disk with lead, L soldered to disk [23]. 

Note 2. Self-made air-tight plugs can be obtainedby substituting stainless-steel or carbon frits with silicone rubber disks cut to the same diameter. 

Headspace sampling. A syringe is inserted through a rubber septum (a rubber disk) in the cap of the vial to withdraw gas for analysis. 

Infusion solutions are administered gradually. Therefore infusion bottles should have a closure which makes this kind of administration possible but prohibits the ingress of microorganisms and other contaminations at the same time. Rubber is the most suitable material for this purpose. Infusion bottles are closed with a rubber stopper, fixed in place by means of an aluminium crimp cap. This provides a more secure closure than a rubber disk with a screw cap on top. 

Rubber disk 3/4 inch (2 cm) in diameter and 1/4 inch (6 mm) thick (leather, neoprene, etc. can be used)... 

Punch hole in center of rubber disk large enough for screw to pass through. 

We will first consider the simple case of a rubber disk confined between two rigid plates and subjected to tension or compression as seen in Fig. 13. There are several solutions based on different boundary conditions and simplifying assumptions. We will see that the extent of constrainment of the elastomer is a key property governing the stress distribution and apparent stiffness of the joint. The amount of constrainment is given by the height to diameter ratio, the Poisson s ratio of the elastomer, and the friction at the substrate-elastomer surfaces as seen in Fig. 14. 

From the above derivation, it is important to note that the effect of constraint increases the stiffness of the component by the factor (1 +a l2h ). As seen in Fig. 15, for large thin blocks of rubber, the effective modulus approaches that of the bulk modulus, B, for compression when a/h is greater than about 10. Thornton et al. analyzed the interfacial stresses for the intermediate case when some amount of friction or adhesion occurs between the rubber disk and the rigid blocks [8]. A new variable, ii, defines the static coefficient of friction for which a critical radius exists at which the shear stresses cannot overcome the coefficient... 

Figure 1.1.3 showed data for torsion of a silicone rubber disk cured between parallel plates of a rotational riieometer. The data are plotted as stress... 

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