Dual Zone Refrigerated Truck/Container Bulkheads PolarBlock flexible-fit and disposable refrigerated bulkheads are changing the way multi freight and mixed load freight are managed for refrigeration transportation companies in the food, produce, floral, and pharmaceutical industries. There is no other solution that is as cost-effective!! You get thermal insulation, flexibility, ease of installation, abuse protection, and reusability/disposability at a low cost. Often, mixed loads are otherwise managed by simply electing not to handle them. When carriers do handle mixed load perishables, temperature zone separation is often accomplished with heavy, expensive and difficult to manage refrigerated transportation bulkheads. Reusable, Disposable, Affordable Refrigerated Transportation Zoni