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19.2.2.3 In cases where the limits in Table 8.1 of UL 746A are exceeded, testing will include one or two temperature aging (UL 746B) using the unaltered basic material as the control reference. Both the impact and non-impact mechanical properties tested in the nominal 3 mm thickness can be considered representative of other properties and thicknesses, however, if a lowering of the non-impact mechanical index is indicated, then the electrical index not tested will be automatically lowered by the same amount and materials may need to be checked after additional aging for retention of flame retardency.
19.2.2.3  revised April 17, 2009

19.2.2.4 Reference materials to be considered as the unaltered basic material for application of the limits in Table 8.1 of UL 746A, and for use as a control in any required tests, shall be a material that has actually been subjected to thermal aging tests and not a material with an assigned temperature index based solely on a previous application of this analysis.
19.2.2.4  revised April 17, 2009
19.2.2.5 If testing of a related material is not indicated in Table 19.1, the material can be assigned the same temperature rating as the original material.
19.2.2.5  revised April 17, 2009

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