Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Paraformaldehyde is the smallest polyoxymethylene, it is the condensation reaction product of formaldehyde with a typical degree of polymerization of 8 - 100 units. Longer chain-length (high molecular weight) polyoxymethylenes are used as thermoplastic and are known as polyoxymethylene plastic (POM, Delrin). Paraformaldehyde commonly has a slight odor of formaldehyde due to decomposition. Paraformaldehyde is a poly-acetal. Paraformaldehyde is used as fumigant, disinfectant, fungicide, and fixation, and for the preparation of pure formaldehyde.

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