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Covestro (formerly Bayer) Desmodur 44V20L polymethylene polyisocyanate crude MDI black material polymerized MDI 9016-87-9
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Covestro (formerly Bayer) Desmodur 44V20L polymethylene polyisocyanate crude MDI black material polymerized MDI 9016-87-9
2023年12月5日
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