Rubber lining performance tests

Example Efficient bonding of headlight assemblies can be performed with rubber-Uke RWM which also enables on-line leakage tests of each headlight... 

Plasticizer migration from the vinyl part into the adhesive bond line can degrade the strength of the joint. Adhesives must be tested for their ability to resist the plasticizer. PVC can be made with a variety of plasticizers. An adhesive suitable for a certain flexible PVC formulation may not be compatible with a PVC from another supplier. Nitrile rubber adhesives have been found to be very resistant to plasticizers and are often the preferred adhesive for flexible PVC films. However, certain epoxy adhesive formulations have also been found to provide excellent adhesion to flexible PVC substrates. Several such starting formulations are presented in Table 16.7. A comparison of the performance of several classes of adhesive when bonding PVC to itself and to various other materials is given in Table 16.15. 

In addition to the signal and power cables, silicon rubber hoses fixed with aluminum clips were mounted to connect the aluminum cooling lines of the detector mechanics and of the supply tubes. A leak test of the 10 cooling lines of each half detector was performed by filling the lines and monitoring the amount of coolant. No leaks were detected inside the pixel system. 

Modern guayule is farmed as a biennial crop with repeated harvests of the same plants. The high molecular weight rubber present in the root and stem base latex sample [Table 5 (12)] indicates that the high 5delding, last harvest of shrub, when a stand is dug in order to replant a new line, also will be of high quality. Film tests of latex purified from stems and roots confirmed high performance characteristics (unpublished data). 

The American Society for Testing Materials (ASTM) has issued a joint report covering a classification system for rubber materials for automotive applications which is based on performance rather than chemical composition. The classification system is based on the premise that the properties of all rubber products can be defined by types , based on resistance to heat ageing, and classes , based on resistance to swelling in a standard oil (ASTM No. 3). The complete specification is, of course, more complicated than this and results in what is known as a line call out as shown in Fig. 10. 

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