A
thermoplastic composition suitable for use in rotomolding applications comprises a) a
polyethylene composition having a melt index, h of from 0.5 to 10 g / 10 min and a density of from 0.930 to 0.965 g / cm3; and b) an additive
package. The additive
package comprises i) a first hindered
phenolic antioxidant compound selected from the group consisting of d,1-alpha-
tocopherol, d,1-beta-
tocopherol, d,1-gamma-
tocopherol, d,1-
delta- tocopherol, n-
propyl gallate (propyl, 3,4,5-trihydroxybenzoate) and mixtures thereof and ii) a first phosphite
antioxidant compound having the formula (I): Formula (I) wherein R1, R2, R4 and R5 are independently selected from the group consisting of a
hydrogen atom and a C1-C12
alkyl group; R3 is selected from the group consisting of a
hydrogen atom and a C1-C8
alkyl group; L represents a
single bond or is an alkylene group having the formula -CHR6-, wherein R6 is a
hydrogen atom or a C1-C12
alkyl group; A is an alkylene group having the formula -CHR7-, a
carbonyl group having the formula - C*(=O)CHR7- where C* is bonded to O in formula (I), or a
carbonyl group having the formula -(C=O)-, wherein R7 is a
hydrogen atom or a C1-C12 alkyl group; and wherein one of Y and Z is selected from the group consisting of a hydroxyl group, an
alkoxy group, an aryloxy group, an alkylaryloxy group and an arylalkyloxy group, while the other one of Y and Z is selected from the group consisting of a
hydrogen atom and a C1-C12 alkyl group.