When should the backing plate be removed for thick layer, plastic installations?

The correct answer is determined by the need to ensure proper bonding and prevent issues related to the backing plate affecting the installation of thick layer, plastic refractories. Removing the backing plate immediately after the installation is completed is crucial because it allows for the proper curing of the exposed surface of the refractory material. If the backing plate is left in place after the installation, it can create a barrier that inhibits the natural escape of moisture from the refractory during the curing process. This can lead to improper drying and potential defects in the finished lining, such as cracks or delaminations.

By removing the backing plate right after installation, any excess moisture can be adequately released, and the refractory can start its curing process without constraints. This practice is essential for maintaining the integrity and performance of the refractory lining in high-temperature applications.

In contrast, removing it before installation may not be suitable, as it can lead to instability during the installation itself. Waiting until the lining dries could lead to complications, as it may trap moisture and impact the quality of the cure. Finally, removing it after installation is undermined could compromise the integrity and stability of the surrounding setup beforehand, making immediate removal the best approach.