| 摘要 |
Liquid cleaner intended for cleaning objects soiled with cured polyurethane foam which is based on 4,4'-diphenylmethane diisocyanate. The cleaner consists, at least, of one of the following compounds: N,N-dimethylformamide, acetone, tetrahydrofuran and methyl ethyl ketone. The cleaning is performed by rubbing the object after it has been immersed in the cleaner for a certain time (35 to 45 min) [in the case of metal injection guns and small objects], or by vaporising the cleaner onto the cured foam [in the case of large objects]. The cured foam becomes flexible and fragile again, and this permits easy cleaning (cutting off).
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