sootproof

English

Etymology

soot +‎ -proof

Adjective

sootproof (not comparable)

1. Resistant to soot.
   • 1921, Chilton's Motor Age: Volume 39, Part 2‎^[1], Chilton Company, page 128:

     A spark plug which will stay sootproof and give long service in any of the Ford cylinders, must be a specially built plug.

   • 1914, The Autocar: Volume 33‎^[2], London: Iliffe, Sons & Sturmey Limited, page 648:

     […] only a sootproof plug is of any use to a Mathis owner.

Alternative forms

• soot-proof