HP condemned the protest in a statement on its website. "The unconstructive antics at HP's headquarters today did nothing to advance the goals that all who care about the environment share," it said.
The company said it would continue its efforts to develop new products and programmes around the globe that would reduce materials and energy consumption and reduce waste through responsible reuse and recycling.
"HP supports industry efforts to eliminate BFR and PVC because of potential e-waste issues. HP is a worldwide leader in e-waste recycling. HP has recycled £1bn of electronic products between 1987 and 2007, and has committed to recycling another £1bn worth between 2008 and 2011," it said.