Typically sandblasting is not required, however sandblasting may be required if the manhole frame is severely corroded. A clean, dry, dust free surface is required to apply EasySeal SG. Please refer to the detailed “SURFACE PREPARATION AND APPLICATION INSTRUCTIONS”.
A Grade Ring has grooves on the underside and a tongue on the upper side to form a tongue and groove joint between multiple Grade Rings, Grade FLAT or Finish Rings. A manhole frame should never be installed on a Grade Ring. The Grade FLAT Ring has only grooves on the underside and a flat top for installation of the manhole frame. Grade Flat Rings will not accept the Angle Ring. Finish Rings have grooves on the underside and are mostly flat on top with a groove located on the inside diameter which is there to accept and lock in an Angle Ring if used.
There are other materials that will work, however all of our testing related to vacuum testing and exfiltration testing has been performed with the M-1 Adhesive. Please contact us or your local representative regarding substitutions.