Assmann manufactures polyethylene/plastic storage tanks and basins for chemical, petroleum, waste water treatment, food processing and other industries. These above ground poly tanks and containers can be used for bulk handling and chemical storage. Available in double wall, vertical, conical, horizontal, and custom configurations.


Since the rotational molding process uses no pressure it will yield stress free plastic tanks or parts, but only if basic processing rules are followed.

We at Assmann Corporation are constantly finding ways to increase efficiency in our process but will not abandon successful methods for any cost-cutting measure that would compromise the quality of the polyethylene storage tanks for which we have become known.

Our plant personnel are our “experts” in polyethylene and plastic storage tanks. They have pride in the plant and their workmanship. All of us extend a welcome to visit our plant in Garrett, Indiana.

Assmann Southwest

Assmann Corporation of America in Garrett, Indiana has opened Assmann Southwest, a full manufacturing facility in Marshall, Texas with state-of-the-art rotational molding manufacturing and equipment. Assmann has capabilities to do all necessary plastic tank and secondary processing such as fittings, vents, fill lines, heat tracing and insulation. Expansion of centralized shipping and distribution creates faster turnaround time and shipping to the Southern and Western states.

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