New York's skyline is scattered with tall wooden water tower structures that are often not noticed. However once you notice them, you begin to notice the vast numbers of them that line the horizon. I recently saw a video of these (shown below) and I it made me ponder whether or not these could be made of rotomolded plastic.

Most buildings over 6 stories high require a water tower to pump pressurized water to the tenants below.

Many of these towers are 25 years old and it makes you wonder what kind of bacteria or rot are festering in this structures. Why not go with a FDA approved polyethylene tank?

Not only is health a concern but what about the cost? These wooden structures can cost up to $40 000 and steel containers $130 000.

The only logical reason I can think that these structures are still to this day made of wood is the ability to carry out the assembly on the rooftop. Buildings elevators are suitably sized to transport small wooden panels. However, hoisting a 10 000 gallon plastic tank on to a 10 story building is not as simple as it sounds.

What reasons can you think of?

http://www.youtube.com/watch?v=sTRkFgqxzl8&feature=related

Searching for rotomolding companies can be quite overwhelming when given all the choices. However, this can be simplified by asking yourself the right questions. For instance you may ask yourself or the molder:

  • Which company will spend the time to discuss my product and assist in adapting the design for the rotomolding process?
  • Will they carry out short production runs of say 50 parts?
  • If a company is very big will they pay attention to my customer service needs?
  • Are drop shipping and freight services available?
  • Are there avenues for frequent communication with the rotomolding engineers?
  • If my product's assembly involves several other operations can these be carried out at the rotomolding facility?

At Roto Dynamics we would be happy to answer all these questions for you. Call us for a quote at 714-630-6399 or email to This email address is being protected from spambots. You need JavaScript enabled to view it.

How to get a quote?

So you have a part, idea or a drawing and are looking to obtain a quote for your rotationally molded part and tool. There are various avenues through which you can contact a representative at Roto Dynamics Inc. in order to obtain the information you are looking for.

The first option is to visit our website at www.rotodynamics.com and click on the "Contact us" tab in the upper section of the page. Below is a screenshot of contact form the link will direct you to.

Your contact information and query can be entered into this form and will be directed to a sales representative who will return to you within 1-2 business days.

If you already have CAD files or drawings and would like to send these to us directly, the second option will be most convenient. These files can be emailed to This email address is being protected from spambots. You need JavaScript enabled to view it. or if you would like to speak directly with someone we can be contacted at (714)-630-6399.

The likelihood of someone coming across a rotomolded part in day to day activities is highly likely if not almost certain. Whether you are driving to work or going on an action packed water sport vacation, it is more than likely that you will come across a rotationally molded plastic part.

Rotationally molded plastic parts play an important role in traffic safety and signage and it is common for rotomolders to manufacture these types of products; these parts include products such as crash barriers, traffic safety cones, parking meter chassis and rail guards.

Even in sports activities many products are rotomolded due the versatile properties of rotomolded plastic. Parts such as Kayaks are rotomolded due to the robust properties of rotationally molded plastic and the ability to manufacture a hollow part with uniform wall thickness. Buoys in particular take advantage of the hollow property which allows foam filling to take place providing the buoy with positive buoyancy. This is also the case with pontoons which can be used to make interlockable floating docks.

The noted cradle to cradle industrial pattern created by William McDonough and Michael Braungart is a pattern Roto Dynamics has noted and has attempted to implement in areas where it is feasible. An important concept in cradle to cradle is the discouragement of downcycling and the importance of upcycling; this can be very difficult to follow in Rotational molding due to the properties of plastic and the manner in which the complex chemical structures behave. However, wherever possible we have attempted to assist our customers in developing products while bearing in mind the importance of recycling and reusing wasted material.

Waste collection and reprocessing is an activity RDI have used in order to do their part in assisting environmental preservation. Rather than throwing excess plastic into the trash where it is disposed of in landfills or combusted, RDI reuses this waste in viable product applications. However, this comes at a cost; various processing methods are required to convert the waste into a reusable plastic resin but RDI believes that the benefits outweigh the costs.

Various industries and organizations such as aerospace, military and agricultural have standards by which they measure their products. As part of their strict development and manufacturing methods there are certain standards and test requirements through these products have to go through before being approved.

Whether these are FAA, FDA or EU requirements, rotomolded parts must comply with these standards where applicable. Specially formulated Rotomolding resins are manufactured in order to comply with these requirements and Roto Dynamics use these on a regular basis. With each order, material certificates (lot assigned) and MSDS sheets can be supplied where requested in order to comply with our customers ISO standards.

If you have a product which must comply with certain standards contact Roto Dynamics Inc. to inquire if these products can be made in our facility.