the condensation catalyst was added during extrusion in the form of a master batch table 1 below gives the respective compositions of the two material samples a and b it should be observed that the silane grafted polymer in this first example was constituted by a linear low density polyethylene grafted to 1 with a silane cocktail which cocktail associated a peroxide and silane specifically it was the composition sold under the name u201c cldo u201d by the supplier polimeri europa the filler was of the flame retardant type being constituted by aluminum trihydroxide ath the dbtl used in sample a was as sold by the supplier goldschmidt under the reference tegokat 218 the lauryl stannoxane used in its sample b was as sold by the supplier goldschmidt under the reference tegokat 225 in order to verify that each sample a and b had indeed cross linked it was subjected to a standardized hot set test hst under mechanical stress that type of test is governed by the standard nf en 60811 2 1 specifically it consists in loading one end of a dumbbell h2 type test piece with a mass corresponding to applying stress equivalent to 0 2 megapascals mpa and in placing the assembly in an oven that is heated to a given reference temperature to within u00b1 2 u00b0 c for a duration of 15 minutes min after that time the elongation of the test piece while hot and under stress is measured as a percentage the.