Benefits and features

Plastek Polys moulds (image, top left) are designed and built to separate at the top. The part line on the product is always in the least stressed area.

Poorly designed moulds (image, bottom left) with parting lines down the sides, lead to weak areas in the tanks wall which can cause splitting

The walls of our tanks (image, top right) are tapered from top to bottom to provide extra strength where the water pressure is the greatest

Plastek Polytanks undergo rigorous testing (image, bottom right) to ensure they meet the requirements of our ISO 9001 certification

Today’s Plastek Poly tanks are the result of 14 years of poly tank manufacturing. Our tanks have evolved from the traditional corrugated look to today’s modern straight wall design, recognized to be the strongest way to manufacture an above ground water tank.

Every tank in our range is manufactured on state of the art computer controlled rotational moulding machines, which guarantees the quality whether you are buying a 500 litre tank to keep the garden green or a 27000 litre tank for your farm. Although a tank is a simple structure, when filled with water the walls are placed under immense tension. The thickness of the walls plays the major roll in determining the strength of the tank. Ribs increase the stiffness of the tank but not the strength as they are of benefit only if the tank is in compression (i.e underground tanks). Plastek Poly tanks are manufactured using the finest grade polyethylene formulated to withstand Australia’s harsh sun. These polymers have been specifically chosen for their long term stability in large tanks and comply with Australian Standards AS2070 (food grade) and AS4020. (Drinking water)

All our tanks benefit from the following features:

• Extra strong one piece construction which prevents entry by mosquitoes.
• Domed roof with moulded in curved ribs to eliminate the need for the centre pole. This removes the problem of broken poles, punctured tanks, and obviously the need for confined space entry and the associated safety risks.
• No vertical part lines down the tank walls. No well made poly tank should ever split open, but of those that do, the vast majority have vertical mould part lines that cause a reduction in wall thickness leading to localised stress that induces cracking.
Maximum shot weight of plastic material to guarantee ample wall thickness. While a number of factors determine the overall quality of the tank, including choice of raw material, oven performance, cooking peak temperature and cooling cycle, the key question to ask any poly tank manufacturer: “How much plastic will you put in my tank?” The weight of plastic determines the wall thickness which determines the strength of the tank.
• Finite Element Analysis (FEA) performed by specialists to computer model the predicted performance of the tank over a 25 year lifespan. These tests are similar to the ones engineers use to measure a high-rise building’s ability to withstand earthquakes.
• World class manufacturing facilities including the latest computer controlled moulding equipment together with a production team with 14 years hands-on experience including in-house testing facilities complete with ultrasonic thickness measurement and impact testing.