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LEGO switched from cellulose acetate (CA) plastic to ABS plastic in 1963. They continued to distribute CA pieces in sets until their existing supply was exhausted, so during the transition beginning in 1963 both types of pieces were sold in sets. In North America, LEGO pieces were manufactured beginning in 1961 under license by Samsonite, which continued to ...


If it is intended to mate with other LEGO products, it is ABS. Just tweaked to be more elastic. Any discussion of materials published by LEGO always says LEGO and Duplo are ABS, with some SBS for tires and rubbery things. There is some sort of polycarbonate used for the clear pieces, but these are rare, and they don't mate well with each-other, so LEGO ...

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