Ebonite Roller They are vital and most important equipment of the process of every machine. Several things like even surface, appropriate material of covering according to the application, consistent hardness over the surface along with perfection workmanship play vital role in the performance of the Roller. Properties Ebonite Covering Designed For Good Covering Strength & Excellent Toughness. Good Resistance To Moderate Chemicals & Mild Acid. Good Heat Resistance.