There are typically two types of impact tests, pendulum and falling weight. The 3 most common variations of the pendulum test are Izod, Charpy and tensile impact test.

The Izod test consists of a rectangular beam held vertically at one end whereas the Charpy test consists of a horizontal beam which is held horizontally and is fixed at two ends.

The impact strength of a part can be influenced by several variables such as room temperature, minimum temperature, material melt index and outside surface temperature. The environment in which the product is being used should comply with the specifications provided on the technical data sheet (TDS).

Complex mathematical models are frequently used in CAD programs in order to provide a stress analysis of a part. There are two approaches which are used; the first analyses the structural response to an applied load when considering time and temperature dependent variables. The second approach is a technique called finite element analysis (FEA). FEA is used to solve complex temperature dependent, loaded structures and is incorporated as a tool in many programs such as Solid Works.

Our team at Roto Dynamics Inc. believes that our job does not just entail the process of rotationally molding plastic parts; there is a dynamic way in which we work together with our customers to nurture and develop a long term business relationship which generates customer satisfaction for both the customer and the end user of the product.

It may not just be a product that we are assisting in the development of, but there are other niche industries which reach out to request consultation on certain plastic processes and plastic properties. Take for instance RSA, they have developed a product which has the ability to extract and capture a fine plastic powder (35 mesh hydrophobic resin) from a pool of water. Roto Dynamics was able to assist RSA in selecting a suitable resin which best suited their product testing. See the video below which demonstrates RSA's skimmer technology.
Reference with permission: RSA Environmental Inc.

A majority of rotationally molded plastic parts require that they have chemical resistance. There are various phases of chemical attack that can occur one of those being a direct chemical reaction with environment within which they are operating. Roto Dynamics manufactures a variety of industrial products which require various chemical resistances; take for example, a tank which is used in the chrome plating industry. There is a requirement that the tanks can hold a concentration of 30% Hydrochloric Acid for a period of 60 minutes and must not degrade. A carefully selected resin was identified by expert resin manufacturers in order to prevent degradation such as environmental stress cracking; as well as having a good ESCR it was important for the resin to have a heat deflection temperature above 70 degrees Celsius.

Many products manufactured at Roto Dynamics Inc. are used outdoors, e.g. RV Tanks, fluid storage tanks and playground equipment. Plastics are sensitive to ultra violet radiation and are not the most stable when exposed to high levels; additives which provide UV stabilization allow such products to be used in these conditions.

Roto Dynamics provides product development, engineering, design, and proto typing of low to high volume production services for our clients in the automotive, aerospace, architecture, entertainment, marine and military industries.
Roto Dynamics has the capacity to handle contract orders from tier 1 OEM suppliers and government agencies. Being a tier 2 supplier for the aerospace and automotive industry gives Roto Dynamics the foresight required to maintain an excellent standard of part consistency and product development.
By working with Roto Dynamics’s team, organizations can design, develop and prototype a product which is ready for production within a matter of weeks. After which short batch and larger production runs can be carried out efficiently; ensuring that product can be supplied when there is demand.
Using Ferry Industry machines provides Roto Dynamics with the ability to carry out short batch prototype runs required for the initial phase of the contract. Whatever production requirements are Roto Dynamics’s ability to quickly turn around tooling allows itself to step production up to the next phase when required.
Having the proficiency to procure military and commercial contracts provides Roto Dynamics with a competitive advantage. This facilitates a smooth and swift transition from the release of an engineering order to the delivery of goods.
If you have a contract you would like to discuss with Roto Dynamics speak to our contract sales specialist today (714)-630-6399.

Roto Dynamics Inc. offers a secondary operation foam filling process. We are able to provide rotomolded parts with increased rigidity, insulation and buoyancy properties where required.
Depending on what your goal is, foam with a specified density can be chosen to give your rotomolded parts the properties they require; should it be an ice cooler requiring insulation properties or a float requiring positive buoyancy RDI has the capabilities to add this feature to your product.

The patented cooler unit shown below is filled with rapidly expanding environmentally friendly two part polyurethane foam. This foam is closed cell and nontoxic, not to be confused with open cell poly urethane foam which can be toxic. The high density foam gives the cooler unit additional insulation and reduces the rate at which heat is dissipated to the internal cavity.
As part of our contribution to environmental sustainability, RDI takes advantage of the foam recycling program offered by our foam suppliers.


  • Increased part Strength
  • Improved insulation
  • Buoyancy properties
  • Various densities to choose from