## 5 Conclusions  
In this work, ISO 5660-1 (cone calorimeter) heat release experiments and NES 713 Toxicity Index experiments were conducted to investigate the impact of varying magnesium hydroxide addition in cellulose finishing materials manufactured using a small press on fire performance and toxic gas production, and the following conclusions were obtained:  
1. The cellulose building finishing material manufactured using a small press exhibited uniform total heat release, consistent CO and CO\({}_{2}\) generation, and uniform mass loss;
2. ISO 5660-1 tests conducted on specimens produced by varying magnesium hydroxide additions revealed that as the magnesium hydroxide content increased, the total heat release rate of the cellulose building finishing material decreased;
3. Based on the results of ISO 5660-1 tests, it was confirmed that cellulose building finishing material, composed of 100 g of cellulose and 20 g of expanded graphite along with the addition of at least 10 g of magnesium hydroxide, did not exceed a THR of 8 MJ/m\({}^{2}\) at 300 s. This affirms its potential utility as a fire-resistant building finishing material;
4. The investigation of CO and CO\({}_{2}\) emissions with varying magnesium hydroxide additions through both ISO 5660-1 tests and NES 713 toxicity tests revealed that, as the magnesium hydroxide content increased in cellulose building finishing material, there was an increase in CO emissions and a decrease in CO\({}_{2}\) emissions during fire conditions;
5. The architectural finishing material produced was confirmed not to emit harmful levels of CO to humans by comparing the CO emissions generated over 10 min in the ISO 5660-1 experiment and over 2 min in the NES 713 experiment, with the levels specified in the NES standard for 30 min of exposure;
6. Through the analysis of Toxic Index values from the NES 713 toxicity test, it was observed that the Toxic Index was high when the magnesium hydroxide addition was 20 g. The Toxic Index decreased above that due to a reduction in CO\({}_{2}\) generation.  
Figure 15: NES 713 Toxic Index by sample type. (**A**) Mg(OH)\({}_{2}\) 0 g; (**B**) Mg(OH)\({}_{2}\) 10 g; (**C**) Mg(OH)\({}_{2}\) 20 g; (**D**) Mg(OH)\({}_{2}\) 30 g.  
Through the heat emission rate data and toxic gas data obtained through the ISO 5660-1 test and NES 713 test, it was confirmed that fire performance could be improved by adding flame retardants to the abandoned paper-based building finishing material, and basic data necessary for evaluating the fire risk of building finishing materials were obtained.  
The ISO 5660-1 experiment and the NES 713 experiment conducted in this study secured basic data on fire performance for small specimen sizes according to specifications. However, data on the application of the manufactured cellulose building finishing materials to actual buildings and the fire performance have not been secured at present. Various studies, such as the size expansion of the current specimen, mass production method, and real fire performance experiment, are needed to determine the applicability of the cellulose building finishing material produced after this study. For future performance-oriented design, it is necessary to conduct a fire simulation based on the ISO 5660-1 experiment and the NES 713 experimental data secured in this study and to compare the applicability of buildings and fire damage reduction by comparing the performance with the building finishing materials currently used in the market.  
Conceptualization, D.R.; Methodology, D.R.; Software, D.P.; Validation, D.P.; Analysis, D.P.; Resources, D.P.; Writing, D.P. and Y.K.; Review and Editing, D.R. and D.P.; Visualization, D.P.; Supervision, D.R.; Project Administration, D.R.; Funding Acquisition, D.R. All authors have read and agreed to the published version of the manuscript.  
This research received no external funding.  
Not applicable.  
Data availability StatementData are contained within the article.  
The authors declare no conflicts of interest.