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  1. zhang, y., et al. (2021). "development of non-tin catalysts for polyurethane foams: a review." progress in organic coatings, 156, 106231.

  2. smith, j.r., & lee, h.k. (2019). "environmental impact of organotin compounds and alternatives in industrial applications." journal of cleaner production, 221, 533¨C542.

  3. wang, l., et al. (2020). "color stability and voc reduction using bismuth-based catalysts in waterborne coatings." coatings, 10(4), 342.

  4. european chemicals agency (echa). (2022). restrictions on the use of organotin compounds. retrieved from https://echa.europa.eu

  5. u.s. environmental protection agency (epa). (2020). organotin compounds: risk assessment and regulatory actions. epa report no. 454/r-20-001.

  6. chen, x., et al. (2023). "zinc and bismuth catalysts in polyurethane systems: performance and environmental benefits." polymer engineering & science, 63(2), 456¨C467.

  7. liu, m., & zhao, w. (2022). "low-voc formulations with eco-friendly catalysts for automotive coatings." paint & coatings industry journal, 48(5), 78¨C89.

  8. iso 16000-16:2021. indoor air ¨C part 16: measurement of volatile organic compounds in air by active sampling on tenax ta sorbent, thermal desorption and gas chromatography using flame ionization detection (fid).


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