Currently the U.N. building complex in New York, built in 1952, is undergoing a massive renovation. The Swedish National Public Art Council and the Ministry for Foreign Affairs have decided on a donation of a contemporary work of textile art for the United Nations, to replace earlier works. Conservators from the Swedish National Heritage Board take part in the planning and now act as advisors on historical and artistic values of the Economic and Social Council Chamber ECOSOC, as well as on the quality and long-term stability of the proposed new artwork. The New York City Fire Code as well as the Security department of the UN Capital Master Plan call for the new work of art to be fire safe. Modern textiles for interiors such as curtains or upholstery material are often treated with fire retardants but are usually not expected to last longer than ten years, but the Swedish National Public Art Council has asked for the new ECOSOC curtain to last for sixty years. The new curtain is going to be made entirely of wool. Since earlier studies at the Swedish National Heritage Board had proved that flame retardants in the long run can be harmful to cellulose material an evaluation of the effects of flame retardants on wool was needed.