O
Optimum cure
State of vulcanization
at which a desire property value or combination of property values is obtained.
Open time
Period of time during which the dry adhesive layers may still be bonded
together (when using a contact
adhesive). Affected by many factors, including temperature, substrate,
adhesive used and amount of adhesive applied.
Syn. Green time
Optical brightener
Additive imparting pure to bluish brightness to polymers and intensifying the
degree of whiteness in ready-to-use white pigmented adhesives; its function is
based on the fluorescence effect.
Syn. Fluorescent whitening agent
Overcure
State of vulcanization beyond the state of optimum cure.
Note: Overcure is generally caused by too long a time or too high a
temperature of vulcanization or post vulcanization, or both, or a surplus of
vulcanizing agents.
