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8. Silicone This rubber has good heat stability and low-temperature flexibility. It is not suitable for high mechanical pressure. Its temperature limit is 600 F (316 C). 9. Viton This rubber has good resistance to oils, fuel, and chlorinated solvents. It also has excellent low-temperature properties. Its temperature limit is 600 F (316 C). 10. Fluorocarbon This rubber has excellent resistance to most fluids, except synthetic lubricants. The temperature limit is 500 F (260 C). Resins. These usually possess better chemical resistance than rubber. Temperature limitations depend on whether the resin is thermosetting or thermoplastic. Tanned Glue and Glycerine. This combination produces a continuous gel structure throughout the material, allowing sealing at low flange loading. It has good chemical resistance to most oils, fuels, and solvents. It swells in water but is not soluble. The temperature limit is 200 F (93 C). It is used as a saturant in cellulose paper. Fillers. In some cases, inert fillers are added to the material composition to aid in filling voids. Some examples are barytes, asbestine, and cork dust. 25.4.3 Reinforcements Some of the properties of nonmetallic gasket materials can be improved if the gaskets are reinforced with metal or fabric cores. Major improvements in torque retention and blowout resistance are normally seen. Traditionally, perforated or upset metal cores have been used to support gasket facings. A number of designs have been utilized for production. Size of the perforations and their frequency in a given area are the usual specified parameters.

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Here you query for all the objects that have not yet been sent (remember the status attribute I spoke about earlier ) using the -getResultSetFromQueue method:

Adhesives have been developed that permit the use of an unbroken metal core to render support to a gasket facing. Laminated composites of this type have certain characteristics that are desired in particular gaskets [25.3].

TABLE 25-1

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25.4.4 Metallic Materials Aluminum. This metal has good conformability and thermal conductivity. Depending on the alloy, aluminum suffers tensile strength loss as a function of temperature. Normally it is recommended up to 800 F (427 C). It is attacked by strong acids and alkalies. Copper. This metal has good corrosion resistance and heat conductivity. It has ductility and excellent flange conformability. Normally 900 F (482 C) is considered the upper service temperature limit. Steel. A wide variety of steels from mild steel to stainless steel have been used in gasketing. A high clamping load is required. Temperature limits range from 1000 to 2100 F (538 to 1149 C), depending on the alloy.

2551 Conformability and Pressure Since sealing conditions vary widely depending on the application, it is necessary to vary the load-bearing properties of the gasket elements in accordance with these conditions Figure 252 illustrates stress-compression curves for several gasket components and indicates the difference in the stress-compression properties used for different sealing locations Gasket thickness and compressibility must be matched to the rigidity, roughness, and unevenness of the mating flanges An entire seal can be achieved only if the stress level imposed on the gasket at clampup is adequate for the specific material Minimum seating stresses for various gasket materials are listed later in this chapter In addition, the load remaining on the gasket during operation must be high enough to prevent blowout of the gasket During operation, the hydrostatic end force, which is associated with the internal pressure, tends to unload the gasket Figure 25.

3 is a graphical representation of a gasketed joint depicting the effect of the hydrostatic end force [254] The bolt should be capable of handling the maximum load imposed on it without yielding The gasket should be capable of sealing at the minimum load resulting on it and should resist blowout at this load level Gaskets fabricated from compressible materials should be as thin as possible [255] The gasket should be no thicker than is necessary if it is to conform to the unevenness of the mating flanges The unevenness is associated with surface finish, flange flatness, and flange warpage during use It is important to use the gasket s unload curve in considering its ability to conform Figure 254 depicts typical loadcompression and unload curves for nonmetallic gaskets The unload curve determines the recovery characteristics of the gasket which are required for conformance.

- (NSArray *)getResultSetFromQueue { NSFetchRequest *request = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:@"Message" inManagedObjectContext:managedObjectContext]; [request setEntity:entity]; NSPredicate *pred = [NSPredicate predicateWithFormat:@"status == NO"]; [request setPredicate:pred]; NSError *error = nil; NSArray *fetchResults = [managedObjectContext executeFetchRequest:request error:&error]; if (fetchResults == nil) { // handle error here. } [request release]; return fetchResults; }

Metallic gaskets will show no change in their load and unload curves unless yielding occurs Load-compression curves are available from gasket suppliers..

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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.

FIGURE 25.3 Graphical representation of a gasketed joint and effect of hydrostatic end force. A, Maximum load on gasket; B, minimum load on gasket.

Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.

-getResultSetFromQueue should start looking awfully familiar to you if it hasn t already. What you re doing in here is very similar to what you saw before in the getNewMessageID method. This time, you re simply setting the predicate to look like the following:

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