Polyoxymethylene (POM) is one of the most important polymer materials. There are only a few studies devoted to ignition and combustion of POM in counterflow with oxidant. The paper presents an experimental study of flame spread over horizontally placed slabs of polyoxymethylene (POM) in still air. The flame spread rate over the polymer surface was measured. Temperature distributions in the gas phase near the solid fuel surface and in the condensed phase were measured using microthermocouples. Spatial variation of the species (СН2О, H2, СО, СО2, О2, Н2О, and N2) concentration in the flame near the solid fuel surface was measured using probing mass spectrometry. Analysis of these data showed that pyrolysis of СН2О took place near the burning surface in the absence of oxygen, to form СО, which was later oxidized to СО2. The data obtained indicate that it is necessary to use a two-step global reaction mechanism of oxidation of volatile pyrolysis products in the gas phase in the POM combustion model, instead of a one-step global reaction mechanism used in the modern models of polymer combustion. The data obtained can be used to develop a coupled numerical model of flame spread over POM.

International Seminar on Fire and Explosion Hazards (9; 2019; Saint Petersburg, Russia). Proceedings of the Ninth International Seminar on Fire and Explosion Hazards [Электронный ресурс]: 21-26 April 2019, Saint Petersburg, Russia. Vol. 2 / Peter the Great St. Petersburg Polytechnic University, Autonomous Non-Profit Organization "Fire and Explosion Safety", Gefest Holding Ltd ; [edited by A. Snegirev [et al.]. — Электрон. текстовые дан. (1 файл : 98,7 Мб). — Saint Petersburg, 2019. — Загл. с титул. экрана. — Свободный доступ из сети Интернет (чтение, печать, копирование). — Adobe Acrobat Reader 7.0. — <URL:http://elib.spbstu.ru/dl/2/k19-97.pdf>. — <URL:http://doi.org/10.18720/SPBPU/2/k19-97>.