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paraformaldehydeA commonly used preservative for starch, xanthan gum, guar gum and other natural polymers that are prone to attack by bacteria. It is as a trimer of formaldehyde and has the formula O-CH2-O-CH2-O-CH2. [..]
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paraformaldehydeA polymer or condensation product of formaldehyde.
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paraformaldehyde
(organic compound) A solid oligomer of formaldehyde that is used as a fumigant, and as a fixative in histology
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