What is a Grease Interceptor?

A grease interceptor is a device used in food preparation areas for the pre-treatment of waste water.

A grease interceptor is also known as a grease trap, grease arrestor, food and oil interceptor, or trade waste tank.

Grease interceptors are installed in-line between a kitchen sink and the sewer.  A grease interceptor has a series of internal baffles that slow the flow of warm water to allow the water to cool.  As the water cools, fats and oils float to the top and solid waste falls to the bottom. As a result, cooler cleaner water flows out to the sewer.

Size (Capacity) Options

Thin skin grease interceptor
Thin skin above ground grease interceptor

Viking Plastics fabricates and supplies grease interceptors in standard and customs sizes.

  • Above ground: 100 – 10,000 litres
  • Below ground: 600 – 10,000 litres

Where there are space limitations, an equivalent capacity grease trap can be custom made to fit the available space.

Viking Plastics has the technology and expertise to fabricate over-sized mega plastic tanks to almost any specification.

Installation Options

Viking Plastics supply grease interceptors for both above ground and below ground installations.

A grease interceptor must be installed by a licensed plumber. The plumber can provide advise regarding the best hydraulic design, venting and backflow prevention.  The plumber will supply a Certificate of Compliance for their work, which will be required by the local water authority.

All Viking Plastics products are supplied with comprehensive installation guidelines.

Tank Construction Options

Tanks construction options include Thin-Skin and Paneltim®.

Thin Skin

  • Above Ground Thin Skin grease interceptors over 250 litres are fabricated from robust 6mm polypropylene. The tanks are also fitted with an external 50x50mm galvanised steel tube support frame for long lasting sturdiness.
  • Below Ground Thin Skin tanks must be surrounded with concrete walls a minimum of 100mm thick. Below Ground Thin Skin tanks have full height keying strips to ensure the plastic tank walls bind to the poured concrete.


Paneltim® is an innovative 50mm thick, dual skin, light weight sandwich panel with an internal cross-rib cell structure that offers superior strength and rigidity.  Paneltim® tanks:

  • are self-supporting
  • do not require an external steel support frame
  • are UV stabilised for long life
  • do not need to be back-filled with concrete thus saving time and money

Above Ground Paneltim® tanks over 2000 litres and Below Ground Paneltim® tanks are typically a more economical option than Thin Skin tanks.

Does my grease interceptor need to be approved?

Water authorities throughout Australia set the design specifications for grease interceptors. Viking Plastics’ grease interceptors are approved for use in most regions of Australia. Viking will supply the correctly designed grease arrestor for your locality. To find your local water authority, click here.

Access Covers

Below ground grease interceptors must be fitted with an access cover (sold separately).  Access covers must be matched to the tank size and the expected load rating (pedestrian, car, heavy truck). For more information on access covers, click here.

Australia Wide Delivery

Viking Plastic’s products are fabricated in Melbourne for Australia wide delivery.  Viking can arrange transport if required.

For further information, request a quote, download the spec sheet or call Viking Plastics on 03 9587 2297.

To view the full range of Viking Plastics products, visit our main site.