How to Choose the Different Types of Pond Liner Materials?

Are you thinking of setting up a pond liner but have no clue about it? Or, Are you looking for a vivid explanation of its types? Then, you’re at the right place. This blog gives you a clear insight into the types of pond liner materials. Basically, A pond liner is an impermeable geomembrane that is used for water retention, such as the lining of water sources, retention basins, hazardous and nonhazardous surface impoundments, garden ponds, and artificial channels in parks and gardens. Let us discuss their types, advantages, and risks in this blog. Different types of pond liner materials

Different Types of Pond Liner Materials

Pond liners prevent water from entering the soil. They act as a barrier between the water and the soil, preventing water loss and they only work if it is free of leaks. Let’s check out the types of pond liners followed:

1. RPE (Reinforced Polyethylene)

RPE pond liners are weldable, fish safe, and resistant to chemicals and UV rays. RPE liners are stiffer than LLDPE liners and they fold well around most pond corners. They are most commonly found lining waterbodies such as canals and dams outside of the pond industry.
RPE is one of the most durable liner materials available Since it has been enhanced, it is certainly stronger and more puncture-resistant and is also significantly thinner.
Potential Risk:
Their major drawbacks are that they’re relatively stiff, more expensive than other types of liner, and lack expected lifespan.

2. EPDM (Ethylene Propylene Diene Monomer)

EPDM liners are soft but durable, with a good balance of flexibility and toughness. They can stretch without losing strength and conform tightly around curves and corners. At high and low temperatures, they do not expand or contract as much as other liner materials. Liners made of this material are strong and cold-resistant, with little risk of cracking at low temperatures.
EPDM liners are also reasonably puncture-resistant and resistant to UV rays, ozone, and weathering and they have a lifespan of 27 years or more when covered and are nontoxic to fish.
Potential Risk:
Some of their demerits include that they cannot be welded, overall chemical resistance is lower, vulnerable to oil and solvent degradation, and costlier than other lining materials.

3. HDPE (High-Density Polyethylene)

When you plan to build a large pond or lake, high-density polyethylene (HDPE) pond liners are the best option. HDPE is highly resistant to UV rays and performs well in cold temperatures. It is also tough and stiff, so it will not tear. The important feature of pond liners is their excellent resistance to a wide range of chemicals. They are often used in landfills and chemical storage facilities, but they are also appropriate for fish ponds.
When covered, HDPE liners have been found to last up to 36 years, irrespective of how they are used.
Potential Risk:
Though HDPE liners are good for large ponds or lakes it has some shortcomings like lack of adaptability, puncture susceptibility, being expensive, getting easily scratched by a rough surface, stress cracking resistance is poor, and extremely high temperatures may cause expansion.

4. LDPE (Low-Density Polyethylene)

LDPE can also be stated as LLDPE (Linear low-density polyethylene) pond liners. LDPE pond liners are all relatively inexpensive. They are weldable, nontoxic to fish, and perform well in typical pondwater temperatures; however, it is also commonly used in liners intended to contain waste or hazardous chemicals.
LDPE has significant advantages, they are softer, more flexible, and malleable. This makes LDPE liners much easier to install and mold around tight corners and nooks and crannies and less prone to stress cracking.
Potential Risk:
They do have some disadvantages like long-term damage, length-wise tears seem to be viable, they are not as resistant to UV rays, chemicals, and oxidation as HDPE liners, and extremely high temperatures may cause expansion.

5. FPP (Flexible Polypropylene)

Flexible Polypropylene (FPP) pond liners are to be considered if physical strength and plasticity are important factors for your pond liner. As the name implies, they are naturally flexible and do not require additives such as plasticizers. As an outcome, they can be easily molded and formed to fit your pond’s tightest corners and nooks and provide a good grip on pond slopes and rough terrain.
Liners made of FPP can withstand a great deal of strain from various angles and stretch without cracking or damaging, making them relatively resistant to tears, scratches, and punctures. They are even flexible until -50°C, making them ideal for ponds in cooler climates.
Potential Risk:
Hydrocarbons, chlorine-containing chemicals, animal fats, and other oils make it vulnerable and they’re prone to oxidative damage, such as stress cracking along edges and wrinkles can be complications of FPP liners

6. PVC (Polyvinyl Chloride)

PVC is commonly associated with pipes and plumbing, but it is also one of the oldest and most commonly used ponds lining materials. its extraordinary adaptability can fit tightly over coarse surfaces and conform to tight corners and crevices. They can also be sealed and folded without fear of stress cracking.
PVC liners are among the easiest to work with because of these characteristics, so pond liners can be installed by yourself and their life expectancy ranges from 18 to 30 years.
Potential Risk:
Using PVC liners in fishponds is not always safe, they’ve weak resistance to ozone, UV rays, and weathering, might suffer from significant premature degradation, and do not work as well in extreme hot or cold temperatures.

7. Bentonite

Bentonite is a type of clay that absorbs many times its weight in water. When artificially installed clay liner is concerned, it usually means bentonite. It is believed that pond owners who seek long-term and minimal solutions find bentonite liners are generally favorable. However, they have some significant contradictory properties.
When compacted, it becomes pliable as well as impermeable. When bentonite clay is installed over the entire surface of the pond bed, up to a foot below the minimum possible water level, it can be a fairly durable liner that may be likely to self-heal when damaged.
Potential Risk:
The main difficulty in clay liners is highly susceptible to diffuse damage, making it difficult to identify the cause at times.

8. Butyl

Butyl is extremely malleable and easy to shape to fit tight spaces in a custom pond. Butyl liners are also extremely long-lasting due to their resistance to UV radiation, ozone, and weathering.
Butyl liners are similar to EPDM liners whereas that they are nontoxic to fish and perform well in both extreme hot and cold temperatures.
Potential Risk:
They are not ideal as they cannot be welded, so pieces must be joined together with adhesives, Chemical sensitivity, are physically weak, prone to punctures and tears, and are expensive.

We hope this blog has helped you learn more about the different types of pond liner materials, as well as their advantages and risks. You can use pond liners for your next pond, but keep in mind that you buy the right type of pond liners for your needs.

Frequently Asked Questions

EPDM (Ethylene Propylene Diene Monomer) and RPE (Reinforced Polyethylene) is the most commonly used pond lining material.
Most flat sheet pond liners are recommended to be 0.75mm thick. It is also recommended a layer of our G3000 puncture-resistant, waterproof membrane underneath to keep root growth, sharp stones, and other unwanted materials from damaging your liner.
They can generally last up to 30 years. Their average life expectancy ranges between 20 and 30 years.
Dark-colored pond liners create a sense of depth, whereas light-colored pond liners blend in with their surroundings. Black and blue are the most commonly used dark colors.
A few times per week, gently sweep any dirt particles and algae toward the bottom drain. If there is no bottom drain, absorb all the particles after it settles post-sweep with a pond vacuum. While using liners, be careful not to scrub too hard or you might rip a hole.
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