Private equity firm Arsenal Capital Partners has made its second acquisition of the week with a deal for Pathway Polymers, a company that supplies polyurethane tire-fill material and equipment.

The company, like Arsenal’s May 1 purchase of Arnco, will be added to portfolio company Dash Multi-Corp., which Arsenal bought in December. Dash, based in St. Louis, Mo., develops vinyl and recycled rubber products. 

Chattanooga, Tenn.-based Pathway Polymers invented TyrFil, a polyurethane tire-fill material intended to flat-proof tires. The product is used by the mining and construction markets. Terms of the deal were not disclosed.

The deal continues to expand Dash’s polyurethane capabilities, Andy Harris, Dash’s chief executive, says.

Arsenal, headquartered in New York, focuses on investing in middle-market specialty industrial and health care companies. The firm closed Arsenal Capital Fund III LP with $875 million in capital commitments in April. Arsenal closed 22 deals in 2012, including a transaction for IGM Resins. The Pathway purchase is the firm’s fifth for 2013.