Suggestions for polyethylene liners in terms of size and use

A polyethylene liner's qualities are mostly governed by its molecular structure and thickness. Additives can also have an impact on liner performance, particularly long-term performance.

When it comes to molecular structure, polyethylene polymers can be constructed in a variety of ways to influence its overall tensile strength, density, and permeability. The degree of branching and the overall length of the chains differ between configurations. When compared to LLDPE, HDPE has less branching in its polymer chains and hence is more rigid and has a higher density. Regardless of thickness, HDPE liners will provide various benefits, including strong corrosion resistance, better chemical resistance, and long-term UV resistance.

Aside from molecular structure and chemical makeup, the thickness of a polyethylene liner is the most important feature. HDPE liners are commonly available in thicknesses ranging from 30 to 120 mil (0.8-3 mm), with thickness determining total permeability, strength, weight, roll length, flexibility, and cost. Permeability of a liner, for example, is directly proportionate to its thickness. As a result, it is possible to select a liner thickness that corresponds to the individual needs of a project. In fact, the thickness should be evaluated during the project design stage and set based on the estimated forces that the liner will face.

The most common HDPE liner size is 40 mil (1 mm), which provides a good compromise between strength, permeability, and cost. This thickness of HDPE liners is commonly used for potable and reserve water, as well as containment, agricultural, and dairy ponds.

While a 40-mil HDPE liner has less overall strength and puncture resistance than thicker versions, it is less expensive. A 40-mil HDPE liner will be less expensive and easier to transport than a thicker choice per square foot of lined area. The 40-mil HDPE liner is also easier to install because to its greater roll length, which minimizes the amount of cross seams that installers must weld.

The 40-mil HDPE liner is commonly used for agricultural ponds and other noncritical applications. The 40-mil HDPE liner supports the containment layer in these applications by preventing pond contents from seeping into the surrounding environment.

Another popular HDPE liner size is 60 mil (1.5 mm), which has more physical strength and is less permeable than the 40-mil type. The increased thickness and strength of the liner also improves weathering resistance, making it more suitable for exposed applications.

Projects that must comply with regulatory authorities such as the Environmental Protection Agency (EPA) should use HDPE liners with a minimum thickness. The EPA, for example, requires a minimum nominal thickness of 60 mil for flexible membrane liners manufactured of HDPE in landfill containment of nonhazardous waste. These standards were put in place to assist decrease the possibility of tearing or puncturing.

In addition, for applications requiring greater liner strength or reduced permeability, a designer will specify a 60-mil HDPE liner—or thicker. They can also select a thicker liner if they believe that a thinner liner will not withstand a region's 100-year weather event. Thicker liners are also better suited for seismically active areas. 

iBourg stands out as the premier manufacturer of polyethylene liners in today's market. With an unwavering commitment to quality and innovation, iBourg has established itself as the industry leader. Their polyethylene liners are not just products; they are a testament to excellence. iBourg's liners are crafted using state-of-the-art technology and the highest-grade materials, ensuring durability, flexibility, and outstanding performance.