Seamless Construction. Exceptional Durability.
Rotational molding produces seamless polyethylene fuel tanks without welds or joints. The process allows complex shapes and integrated features while maintaining consistent wall thickness and structural integrity. Rotomolded tanks are widely used across the marine industry due to their durability and corrosion resistance.
What Is Rotational Molding?
Rotational molding is a manufacturing process where polyethylene powder is heated and rotated within a mold to create a uniform, seamless tank structure. Because there are no welded seams, the result is a durable, leak-resistant fuel tank capable of handling the demands of marine environments.
Why Use Rotational Molding?
Seamless Construction
Corrosion Resistance
Design Flexibility
Long Service Life
What Is RotoLoPerm®?
RotoLoPerm® is Your Best Evaporative Emissions Solution to Reach Marine Fuel Tank Compliance.
Dometic Fuel Systems has an exclusive marine licensing agreement with Centro Inc. of North Liberty, Iowa, to produce marine fuel tanks using its patented multi-layer RotoLoPerm® process. RotoLoPerm® complies with Clean Air Act and Marine Fuel Tank Permeation regulations.
Dometic Fuel Systems customizes the application of RotoLoPerm® to the precise manufacturing specifications of each customer and has in-house engineering expertise to assist in developing the best design with special fittings for each marine fuel tank manufactured.
RotoLoPerm® Advantages
Certified by design
Ultra-low permeation levels
Successfully passed standard marine fire test
Cost-effective
Abrasion resistance
Moldability
The Crosslink Polyethylene Advantage.
Dometic Molded Products pioneered the development of custom rotationally molded plastic fuel tanks for the marine industry. Today, Dometic has manufactured over 1.5 million fuel tanks for marine, agricultural, and industrial use. With fuel tanks manufactured in all sizes and shapes, the company has produced fuel tanks ranging in size from 1 gallon to 195 gallons.
The Crosslink Polyethylene tank technology offers many advantages over fuel tanks made of metal or other materials:
Custom design and engineering, using Solid Works 3D Solid Modeling
Design flexibility and configured to customers' requirements
Uniform wall thickness
Crosslink Polyethylene Resin (XLPE)
Impact strength
Environmental stress-crack resistance
UV stabilization for long-term outdoor protection
Inserts and fittings able to be incorporated as integral components
Integrally molded fill and vent
Variety of colors and textures
Economical tooling cost
Hold down features
Design-based testing - Fire test, shock test, pressure impulse test
100% (4.5 psi) pressure check on all tanks
Product longevity
Ready for finishing and installation
An Integrated Fuel System Consists Of:
A low permeation fuel tank, RotoLoPerm®.
Tank mounted grade rollover valve(s).
Tank mounted fluid level vent valve.
Inlet check valve.
Carbon canister system or pressure relief system.
This system controls diurnal emissions as well as the fuel level of the tank. Overfilling of the tank, fuel spit back through the fill neck and vent tube are eliminated. These systems meet the requirements of the EPA, CARB, and EBYC H-24. INCA works with all of the major fuel system integrators to develop compliant integrated fuel systems.
Ready To Specify Rotomolded Tanks For Your Next Project?
Connect with our experts to start your next marine fuel tank project.