Hilton Worldwide has extended to Japan its key corporate social responsibility program to recycle leftover soap for reuse in developing Asian countries, the hotel chain operator said Tuesday.

All 10 hotels in Japan have joined Hilton's global initiative, alongside 700 fellow hotels worldwide, to improve sanitary conditions of underprivileged children while reducing waste.

The program will sees Hilton Worldwide collect bars of soap from more than 5,300 guest rooms in Japan and donate them to a Hong Kong-based nongovernmental organization, which then sanitizes and processes them into new bars. The products are delivered to needy people in 10 developing countries, including the Philippines, Vietnam and Myanmar.

During a preliminary period in Japan that started last October, the hotel chain contributed some 20,000 recycled bars, processed out of 2.3 tons of used soap, primarily to people who suffered from Typhoon Haiyan, which hit the Philippines in November.

"This initiative reinforces our efforts to reduce waste output and strengthen communities," Timothy Soper, vice president for Hilton Worldwide, said.