Plastic Water Tank: Composition, Advantages & Disadvantages

Plastic Water tank

Plastic tanks available are usually made of polyethylene, making them lightweight, non-corrosive, and easier to manage. Since these tanks are in a single piece and don’t have any joint. They are largely leakproof and completely resistant to water-induced damages. If for some reason the plastic tank might have some damage, it can conveniently be repaired with a sealant.

It is this versatility that makes plastic tanks more durable than concrete tanks in the longer run. A couple of issues that plastic water storage tanks do gather are realities like they do not keep the water temperature stable, or that they have a low resistance to UV light causing the tank to ultimately turn break. However, if choose the perfect plastic water storage tank most of these problems accommodated. These tanks are available in different shapes like circular and cubical etc.



Plastic water tanks are rotating molded. It is usually made of high-density polyethylene. The manufacturer’s steel canister mould is filled with plastic granules or powder and rotated over a heating source to thaw the plastic. When the plastic is thawed and the cylinder has cooled, it’s opened to get the new tank.
Some steel cylinder moulds have flanges down the side to make it

simpler to take out the tank from the mould. Tanks made in these moulds will show a line where the mould joins, but this is not a joint in the tank. The tank is made in one piece without any joint.



The plastic water tank does not corrode. It is rustproof as compared to the RCC water tank. Since the tank is water-tight, the components remain without dust and mosquitoes. Therefore, it is much more hygienic.

Its Price, color, water quality, weight, and ease of installation are making it popular. The tanks are relatively inexpensive, they come in a range of colors, they’re designed to hold drinking quality water, and they’re lightweight and straightforward to install. Some models are also reinforced for underground installation.


However, these tanks are lightweight they can turn weak over time having UV light. Usually, plastic is not strong in the presence of UV light. However, the advancement in the field of materials has led to the introduction of better-quality durable plastic water tanks.
In the summer period, the water gets and remains hot for a long time. This is to enclose the tank with some kind of material like cover with brick walls, thereby shielding it from the straight sunlight. This type of tank is tough to clean.

Exposure to UV Light


Unprotected plastic tanks exposed to sunlight for a lengthy period of time, absorb ultraviolet light, which can cause discolorations, brittle and eventual cracking. Fluorescent lights have a similar impact. Increased temperatures can accelerate the brittle process. Tank products are moulded from materials using the latest innovation for UV stabilizers which significantly minimize the dangerous impacts of UV light. For better safety, maintain tanks out of straight sunlight or placed dark-colored tanks which will further hamper the impact of UV light.

Environmental Stress Damaging


Particular surface-involved materials, although they have no chemical impact on polyethylene, can increase their cracking when under stress. Raised temperatures are likely to accelerate the cracking. Although all polyethylene is subject to stress cracking, some are more resistant to it than others.

The degree of stress on the plastic has a direct bearing on its resistance, therefore a tank and system must be created to minimize stress. Tanks are built successfully stress-free, employing materials that are very resistant to ecological stress cracking, and hence are much less prone to cracking than produced tanks. Stress cracking agents are surface-active materials. Necessary maintenance should be taken to reduce stress.

Shapes and sizes


Plastic tanks are available in a massive variety of colors and designs, including round, modular, and bladder. Plastic water tanks are available in various sizes, from 300 liters to 50,000 liters and more. For high-density living, modular tanks or bladder tanks under floors can be the most effective option.

Bladder tanks contain a steel frame around a flexible plastic and can be suitable for residences installed on stumps or post-mounted decking. Some underground plastic tanks are also well reinforced and can endure significant loads.



Water quality

All plastic water tanks in the market should comply with local Standards requirements for the use of products in contact with drinking water. Poly tanks also have their own manufacturing standard, which covers all aspects of the tank’s style and manufacture.

Some bladder tanks utilize PVC bladders. If a plastic bladder tank use for drinking purposes, make sure the standards of the bladder is as a potable water bladder.