For FAR -23/25 certificated aircraft interiors, the fabric and materials must meet Part 23, Appendix F or Part 25, Appendix F burn test requirements. The applicable Appendix F test must be performed by an FAA Repair Station who will certify that all materials and fabrics meet the regulation. This statement must be made part of the aircraft's maintenance records. If you buy interior fabric or materials that will be used on both Part 23 and Part 25 aircraft be sure that the repair station certifies that the material/fabric meets both Part 23 and Part 25 requirements.