Boxes move along a conveyor belt at an Inc. fulfillment center.

The Federal Aviation Administration said it would fine Inc. AMZN -0.73 % $130,000 for allegedly mishandling shipments of dangerous chemicals, marking three fines in less than two weeks the agency has penalized the retailer for violating rules related to shipping hazardous materials by air.

Workers at a FedEx Corp. FDX -4.54 % sorting facility in Lake Wales, Fla., discovered that the product, called Rid O Rust Stain Preventer Acid, had leaked through one of the cardboard boxes.

The next month, Amazon sent a box containing a 19-ounce container of Simple Air EZ Green,a flammable gas used to clean heating and air conditioning systems, by air from Whitestown, Ind., to Glendale, Calif., the FAA said.

The agency proposed a fine of $78,000 for the May, 2014 incident and $52,000 for the later incident.

The fine comes after the FAA levied a $350,000 fine on Amazon earlier this month for a similar alleged violation that also occurred in 2014.

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