Table 2. The inventory data for the life cycle assessment of KF-94 single-use face mask based on the reference flow

Stage	Category	Amount	Data
Manufacturing	Filter	3.85 g	Textile, non-woven polypropylene {RoW} | textile production, non woven polypropylene, spun bond | cut-off, S [5]
	Ear straps	0.39 g	Polyurethane, flexible foam {RoW} | market for polyurethane, flexible foam | cut-off, S [5]
	Nose guard	0.44 g	Aluminum, wrought alloy {GLO}| market for | Cut-off, S [5]
Transportation	Transportation from raw material supplier to manufacturing factory	0.234 kgkm	Transport, light commercial truck, diesel powered/tkm/RNA
	Transportation from manufacturing factory to market	0.936 kgkm	Transport, light commercial truck, diesel powered/tkm/RNA
Disposal	Incineration	64%	Municipal solid waste (waste scenario) {KR} | treatment of municipal solid waste, incineration | cut-off, S
	Landfill	31%	Municipal solid waste (waste scenario) {RoW} | treatment of municipal solid waste, landfill | cut-off, S
	Environmental degradation	5%	Municipal solid waste (waste scenario) {GLO} | treatment of municipal solid waste, open dump, wet infiltration class (500 mm) | cut-off, S