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  1. astm d3574 ¨C standard test methods for flexible cellular materials¡ªslab, bonded, and molded urethane foams.
  2. european chemicals agency (echa), "restrictions on certain hazardous substances in polyurethane foam production", 2022.
  3. joseph p. kennedy et al., science and technology of polyurethanes, crc press, 2020.

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