A phosphite is provided having the formula: IMG wherein Y1 is an alkyl group and Y2 is selected from the group consisting of sec-butyl and tertbutyl. A solid amorphous phosphite composition is also provided which preferably contains an aliphatic polyamine. The phosphite exhibits enhanced stability including hydrolytic and UV stability, and is useful in stabilizing thermoplastic compositions. The phosphite composition exhibits further enhancements in hydrolytic stability, and is useful in stabilizing thermoplastic compositions.
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