RTIs

UTI, GUT, skin infections, upper and lower RTI, and GI tract infection... 

Carbometalation, an important reaction of RTi(TV) compounds ia which RTi adds to a C=C or CM2 multiple bond and results ia a net R—H addition, is iavolved ia Ziegler-Natta polymerisation as follows ... 

This long-term thermal performance of a material is tested alongside a second, control, material which already has an established RTI and which exhibits a good performance. Such a control is necessary because thermal degradation characteristics are sensitive to variables in the testing programme. Since the control material will also be affected by the same unique combination of these factors during the tests, there is a valid basis for comparison of test and control materials. 

It is to be expected that the RTI obtained would depend on the property assessed and in UL 746B three properties are assessed ... 

A value for the RTI is provided for each of these tests although in common experience it is found that similar numerical values are obtained. 

In addition, the RTI may be affected by the thickness of the sample, so this should be given in any RTI specification. 

Some collected values for RTI taken from the literature are given in Table 9.1. (These are given for guidance only and should not be taken to imply official UL ratings.)... 

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