Rein the scenario of a vehicular crash, seat belt webbing is subjected to dynamic forces that could reach several thousand pounds. Its engineering must, therefore, balance two fundamental properties: strength and flexibility. Use a heavy-duty machine for thick fabrics. Load your machine with thread that is suitable for seat belts. https://www.saludcapital.gov.co/sitios/VigilanciaSaludPublica/Lists/Contactenos/DispForm.aspx?ID=756292