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[1] oertel, g. (ed.). polyurethane handbook. hanser gardner publications, 1994.
[2] frisch, k. c., & saunders, j. h. the chemistry of organic film formers. interscience publishers, 1967.
[3] liu, y., et al. "thermal and mechanical properties of polyurethane foams prepared from different mdi types." journal of applied polymer science, vol. 135, no. 28, 2018.
[4] zhang, h., et al. "effect of mdi index on the microstructure and performance of rigid polyurethane foam." materials research express, vol. 6, no. 10, 2019.
[5] technical data sheet: desmodur? 44v20lc, 2023.
[6] product brochure: lupranate? m20s, 2022.
[7] chemical technical guide: papi? 27, 2021.
[8] chemical product specification: pm-200, 2023.

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