It is used as backing for elastomeric sealants in Horizontal Joints in Rigid Pavements Its circular section provides a convex shape to the sealant giving it a minimum strain shape. It also aids in preventing three- point contact of the sealant.

Advantages:

1) Prevents Three Point Adhesion.

2) Excellent movement accommodations 3) Excellent bond breaking ability

4) Avoids Air Bubble in Poured Sealant

Acts as water barrier and is chemical resistant.