Posted on 09/06/2016 in News 32 2016
Seafood shell waste as natural flame retardants

Seafood consumption generates large volumes of shell waste, composed of calcium carbonate, mineral oxides and some organic materials. In a new study, ground and washed sea shells were tested as a flame retardant in ABS polymer. 25% loading did not significantly modify ABS mechanical properties and enabled a 40% decrease in peak heat release rate and a nearly 50% increase in time to ignition compared to pure ABS.

The seashells improved fire performance somewhat more than pure calcium carbonate, suggesting a positive impact of the other minerals present, e.g. iron. Previous studies reported that a combination of ground oyster shells and a phosphorus PIN flame retardant (Clariant Exolit AP760) can provide fire performance for polypropylene.

“Highly flame retardant green composites using seashells”, Moustafa, Duquesne, Darwish & Youssef, Plastics Research Online, 31st March 2016
“Clariant’s Exolit® ensures protection for renewable polymers in oyster shell – reinforced polypropylene 20th January 2014 and pinfa Newsletter n°38.

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