Machine-translated by Google. Questions are authored in English.
Top

Discussion

An extender differs from a pigment in that it

  • A.evaporates away during the drying
  • B.contributes little opacity but adds bulk
  • C.provides the colour of the whole paint film
  • D.dissolves entirely in the binder

Answer: B

China clay, calcium carbonate and talc have refractive indices close to that of the binder, so they scatter little light. They are used to control gloss, flow and cost rather than opacity. Their refractive index is close to the binder.

No comment is present. Be the first to comment.
Loading…

Post your comment

Please log in or register to post a comment.