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This paper is to analyze the smoke characteristics of wood flour-HDPE composites. The wood flour-HDPE composites were manufactured by modular co-rotating twin screw extruder. In order to analyze smoke characteristics, Cone calorimeter tests(by ISO 5660-2) and smoke density tests(by ASTM E 662) were performed. The specimens for these tests were differently made by adding flame retardants. The results of cone calorimeter test showed that adding flame retardants specimens are lower total smoke release, total smoke production than those of wood flour-HDPE composite. Also the results of smoke density test showed that adding flame retardants specimens are lower initial smoke data and maximum specific optical density than those of wood flour-HDPE composite. The most effective flame retardant is magnesium dihydroxide to decrease smoke characteristics.

In this study, we were manufactured wood flour-HDPE composites by modular co-rotating twin screw extruder with L/D ratio of 42. We was measured cone calorimeter test and thermogravimetric analysis (TGA) to find the combustion characteristics and thermal properties for wood flour-HDPE composites. We then evaluated the effect of three additive-type flame retardants on fire resistance performance. The cone calorimeter test showed that the heat release rate (HRR) of untreated composites was the highest Peak HRR () as well as Mean HRR (). From the TGA, it was shown that composites added flame retardants began early thermal decomposition and improved thermal stability.

The flammability of materials is regarded as a critical design factor in the aerospace industry. Employing flammable materials, however, is inevitable sometimes in developing a launch vehicle. There are several common methods that can reduce the hazard of flammability, such as replacing flammable materials with non-flammable materials and blocking fire propagation paths by using non-flammable material covers. For the first step to ensure fire safety, flammability tests should be performed for the materials employed. In this regard, the materials of KSLV-I upper stage were tested in accordance with the NASA-STD-6001 and ECSS-Q-70-21 standards.