Can I store products in your tanks at high temperature?
The common industry recommendation for storing hot liquids in polyethylene tanks is to not exceed 140 to 150 degrees F. We have found that all polyethylene tanks start losing sidewall strength at about 120 degrees F. If you have an application that exceeds 120 degrees F, you may want to consider adding a fiberglass reinforcing on the sidewalls. We have a full fiberglass shop and can install a fiberglass wrap on any of our tanks. Adding the fiberglass wrap to your tanks will allow it to handle temperatures up to 175 degrees F in some applications.
Source: FAQs - Peabody