Demilec, a manufacturer of spray foam products, has recycled its 300 millionth plastic bottle into its Heatlok family of closed-cell insulation products.

Since the company launched its recycled bottle program in 2004 it has diverted tons of plastic containers — mostly of soda and water bottles — from landfills and has helped offset the use of new petroleum in its products.

In addition to earning points for using spray foam insulation, projects that use Demilec’s Heatlok products may also earn additional points in many green certification programs, including the United States Green Building Council’s LEED program, for its recycled materials content, as well as its use of renewable resources. Heatlok products also use oil from soybeans.

A report released last week by the Association of Postconsumer Plastic Recyclers and the American Chemistry Council found plastic bottle recycling grew 120 million pounds in 2013, edging up 4.3 percent, to top 2.9 billion pounds for the year.