Standard Backer Rod is an ideal non-absorbent compressible backup material inserted into a joint to control sealant depth, create a backstop to allow proper sealant tooling, allows proper sealant of the joint surfaces, yields a proper bond between the back-up material and the sealant. It can also be used as a temporary joint seal. It is commonly used for glazing operations, window and door applications, expansion joints, curtain wall joints, partitions, log construction or pavement joints. Standard Backer Rod is an extruded round, closed cell, low density polyethylene foam material with a skin-like outer texture. It is highly flexible and compressible for easy installation. This material is compatible with butyl, polysulfide, acrylic, polyurethane, silicone and most other cold sealants.