Dick Johanneck started Polytank, Inc. in 1972 doing custom rotomoulding. In 1977, he began making calf hutches which became known as Poly Dome Calf Nurseries. The agricultural products division of Polytank was later named PolyDome. Since that time, Polytank and PolyDome have added over 200 products to their line. Polytank has dealers across the United States, Canada and 10 foreign countries. The rotomoulding process uses hollow metal moulds and a powdered polyethylene plastic that becomes liquid under high heat. The moulds with the liquid plastic inside are spun on both vertical and horizontal axis to form a uniform thickness, or skin on the outside walls, thus the name rotomoulding. the mould is removed from head and allowed to cool under controlled conditions to avoid shrinkage or warpage. The resulting polyethylene plastic is resistant to impact, most corrosive chemicals and temperature extremes. The slippery surface makes it very easy to clean.