Wood from threatened south-east Asian rainforests has been used to build venues for the Tokyo 2020 Olympics, according to complaints filed with organisers.

At least 134,000 large sheets of tropical plywood from Malaysia and Indonesia have been used as concrete moulds to build stadiums, causing what campaigners say is irreversible harm to precious biodiversity reserves.

Charge sheets seen by the Guardian accuse the authorities of purchasing policies “resulting in the permanent loss of tropical rainforests in Indonesia as well as the destruction of critically endangered orangutan habitat in Borneo”.

The allegations focus on the use of 8,700 tropical plywood sheets mostly supplied by the Korean-Indonesian firm Korindo. A report by a group of environmental NGOs this month alleged that the wood was being used to construct the Ariake arena, a planned volleyball venue, despite the lack of credible sustainability certification.

In response to the report, Korindo said it operated in full accordance with Indonesian law, that it did not use illegal wood, and that it acquired the agreement of local communities.

Japan’s huge new national stadium may also have been built with the wood, campaigners fear.

Hana Heineken, a spokeswoman for the Rainforest Action Network, which co-filed the complaints, said: “The Tokyo Olympics’ use of Korindo wood is a flagrant breach of the commitment by Olympic organisers to host a sustainable Olympic Games in 2020.”