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    1. product datasheet – lupranate ms, se, ludwigshafen, germany, 2023.
    2. technical guide for polyurethane systems, the chemical company, usa, 2022.
    3. technical bulletin – suprasec series, ag, germany, 2023.
    4. chemical product manual – pm200, industrial group, china, 2023.
    5. zhang, l., et al. (2021). "performance comparison of polymeric mdi in rigid foam applications", journal of applied polymer science, vol. 138, issue 12.
    6. li, y., & wang, h. (2020). "environmental impact and processability analysis of polyurethane raw materials", chinese journal of environmental engineering, vol. 14, no. 5.
    7. european chemicals agency (echa) – reach registration data, https://echa.europa.eu/, accessed april 2024.
    8. iso 844:2014 – rigid cellular plastics ¡ª determination of compression properties, international organization for standardization.

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