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The Shiyan explosion came a day after eight people died and three others were injured when toxic methyl formate leaked from a vehicle at a chemical handling facility in the southwestern city of Guiyang.

The leak happened as workers were unloading a shipment of methyl formate from a vehicle at a chemical handling facility.

Methyl formate is used in a variety of chemical processes and as an insecticide.

Altogether new technologies include foams blown with HFOs or methyl formate, and transcritical CO2 – a refrigeration technology already used in supermarkets.

The known syntheses are effective, and methyl formate is already cheap.