________ is defined as the amount of time that any product can be used once it has been opened.
(a) Aging
(b) Permeation
(c) Shelf life
(d) Transmission rate
I have been asked this question in class test.
My question comes from Vulcanization and Forming of Rubber, Adhesion Process and their Types topic in portion Glass & Elastomers of Engineering Material & Metallurgy