BULK TECH, INC. Offers A Wide Selection of Welded Steel Hoppers And Hopper Bottom Bins. Our smooth-walled bins and hoppers have a heavy-duty design which exceeds engineering specifications. With storage tanks, the most important factor of determining longetivity is the quality of its coating finish. That`s why Bulk Tech sandblasts all its products to ensure a top quality preperation for paint and powdercoat to adhere. The result is a bin and a finish that does its job, year after year–just like you do.