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Z94.12.6 Plastics

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UNDERCUT. Any depression on the mold which prevents or hinders withdrawal of the molded article.

UREA OR UREA FORMALDEHYDE RESIN. A synthetic resin derived from the reaction of urea (carbamide) with formaldehyde or its polymers.

UREA PLASTICS. Plastics based on resins made by the condensation of urea and aldehydes.

URETHANE. (See ISOCYANATE RESINS.)

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