Moeller Industrial

One-Stop Shop for Rotational Molding

Plastics Primer

Rotational Molding

Rotational Molding is a manufacturing process for creating one-piece hollow parts of uniform thickness and density with no weld lines or joints.

Rotational molding:

  • Is versatile. Spin-welded parts are easily re-located during the assembly process.
  • Enables complex mold split lines, molded threads, and mold-in inserts.
  • Allows for a wide range of surface finishes (textured, smooth, or polished).
  • Results in very little material waste.
  • Produces a strong, durable product with low residual stress.
  • Is relatively inexpensive.
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welds-on-tooling masters-of-aluminum
Masters of Aluminum

We respond quickly to your requirements for a new or modified mold because we can—we build 99% of all tooling in-house.

Aluminum Tooling

Moeller artisans build molds across a range of sizes and unusual geometries. Once your initial production run is finished, we maintain your tooling inside our Sparta, TN warehouse (for easy access and to prolong the life of your investment) until you order more parts. Tool making is a science and an art. Our Mold Shop Team represents an elite corps within Moeller: 15 highly skilled tool makers and craftsmen working two shifts with more than 150 years of experience in the trade.

Low Permeation Fuel Tanks
Moeller Barrier Technology Available in 6-500 Gallons

Regardless of tank geometry, Moeller barrier fuel tanks contain an inner layer of ethanol-compatible nylon and an outer layer of cross-linked polyethylene (XLPE). The result: a UV-, slosh-, and abrasion-resistant construction which complies with the following standards and regulations:

  • EPA 40 CFR 1060
  • ASCG/ABYC H-24
  • ISO 10088 Mil-STD Thermo Shock

Fuel Tanks: Why Choose Plastic?

How does plastic compare with steel? Since the early 1970s, plastic fuel tanks have gradually replaced steel. Today, more than 90% of all tanks built for European light vehicles are made of plastic.


  • Is lightweight (up to 20% lighter than steel)
  • Provides equivalent — or better — reliability
  • Enables design flexibility; may be produced in complex geometric configurations
  • Will not rupture or leak through seams or welds
  • Reduces thermo transfer
  • Is corrosion-free, with minimal-to-no delamination

Moeller Barrier Tanks are also:

  • UV resistant
  • EPA emissions-compliant
  • Available in gasoline or diesel

Characteristics of Moeller Plastics


Plastic is a material consisting of any of a wide range of synthetic or semi-synthetic organic compounds that can be molded into solid objects. Characteristics of different plastics vary widely; Moeller engineers will help you determine the ideal material for your particular application. Factors we consider for each unique job include:

  • Resistant properties (Chemical, heat, UV, etc.)
  • Weight
  • Tensile Strength
  • Hardness/Impact Strength
  • Insulating Properties
  • Flexibility
  • Cost


A thermoset is a polymeric material that undergoes irreversible chemical changes when it is cured through heat, catalysts, or ultraviolet light. Cross-linking prevents any movement of molecular chains after curing. Once cured, the structure cannot be altered.

A thermoplastic is a polymeric material or plastic that becomes soft and formable when heated, and rigid when cooled. This process may be repeated a number of times without chemically altering the material.

We rotationally mold three types of plastic: Cross Linked Polyethylene (XLPE), High Density Polyethylene (HDPE), and Linear Low Density Polyethylene (LLDPE). XLPE is a thermoset plastic, while both HDPE and LLDPE are thermoplastics.

Thermosets meet the demands of harsh environments because they withstand heat and pressure for long periods of time. Thermoset plastics are impact resistant, with exceptional electrical insulating properties. Their dimensional stability, creep and chemical resistance, stiffness, and high temperature capabilities make them the preferred material where reliable performance in adverse conditions is critical.



rgbThermoplastics deliver high strength, high impact- and shrink-resistance, and bendability. Moeller spin welds fittings and components on thermoplastics tanks for semi-customization at minimal cost. Thermoplastics offer a range of finishes: from hard crystalline to rubbery surfaces. The natural white hue of the resin enables precise matching across the full color spectrum. Two thermoplastic options are available: LLDPE and the more rigid–and less permeable–HDPE.


Quality Rules

It is no wonder that MasterCraft Boat Company—a 2015 Industry Week Plant of the Year with more than 2,000 suppliers—voted Moeller Supplier of the Year in 2015 and Quality Supplier of the Year in 2016. “Moeller is an example for other suppliers to look up to,” Quality Manager Jamey Ormond, affirms. “We’re excited to have Moeller as a partner.”

Moeller’s winning quality program comprises four distinct facets:

  • PPAPs
  • In-Line Quality Assurance
  • ISO 9001:2008 Certification
  • 100% Testing Capabilities on Site

Moeller Engineering Services



Moeller boasts 200+ years of in-house technical know-how: degreed engineers, trained designers, experienced tool makers, and the finest shop technicians in the industry. Certified SolidWorks designers upgrade to the most recent version each year. Engineers and designers keep certifications up-to-date through corporate sponsored training.


Do you need quick turnaround on a quote or design? Call us! We produce 99% of all tooling and molds in-house: no waiting for subcontractor-related delays.


Moeller Industrial is ISO 9001:2008 certified. Depending on the production class, products are manufactured to EPA, NMMA, ABYC, and CE standards. We manage all projects via our comprehensive Engineering Control System (ECS) to ensure accuracy and timely communication.


For projects with extraordinary polymer or physical properties characteristics, Moeller retains the services of polymer scientist Ashok Adur, PhD. We partner with industrial design firms who specialize in rotationally-molded product innovation, and team with engineers from our resin suppliers; leaders in the rotomolding polymers industry.


At Moeller, we point to specific achievements. Since the mid-1990s, Moeller has been awarded 16 patents for design and process innovations. In 2011, Moeller introduced diurnal tank technology and has pioneered significant design and service developments every year since then.


Moeller Industrial
801 North Spring St.
Sparta, TN 38583
Tel: 1-800-432-8344
or 1-931-738-8090
Fax: 931-738-9835

At Moeller, we deliver products which precisely satisfy your requirements. That's because we take the time to understand your needs, from the inside out. Put us to work for you!
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Moeller Marine Products ISO 9001:2008 Certified

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