Polyethylene foam is a versatile foam that is known for its durability, light weight, and resiliency. It’s these properties that make the foam ideal for foam packaging, cushioning, gasketing, and a variety of other healthcare and marine foam applications. The material starts off as a thermoplastic that is then converted into a foam. It’s similar to rubber, but still maintains the soft and protective qualities of a foam material.
The Essential Properties and Benefits of Polyethylene Foam
Polyethylene is a closed-cell material that is easy to process and fabricate. It has some excellent natural qualities that manufacturers and fabricators find useful. These include:
- High chemical and moisture resistance
- Good tear resistance, shock absorption and strength to weight ratio
- Non-abrasive and non-dusting
- Vibration dampening
- Resistance to mold and mildew
- Thermal insulation
- Flexible and easy to work with
- Variety of color options
There are many different polyethylene foam options. Choosing the right one for your application requires you to understand the individual properties and strengths of each type of foam.
Crosslinked Polyethylene Foam (XPE or XLPE Foam)
Crosslinked polyethylene foams have a strong and rigid structure that makes them more durable and resistant to gas and moisture penetration, making them great options for gasketing applications. They also have good resistances to shock and vibration, as well as strong insulating properties. XLPE foams can be made fire retardant and static-dissipative.
XLPE foams can either be chemically or physically crosslinked, the process by which the molecules are connected form chained connections. Chemical crosslinking involves adding chemical inflating and other agents during the molding and extruding process, creating dense cells that increase the durability of the foam. While the foam is durable, the surface often looks rough and may not be the most aesthetically pleasing.
Physical crosslinking creates a finer, larger cell structure that is more consistent. The links are weaker, making the foam more resilient. These types of XLPE have a smoother surface that looks better than chemically treated XLPEs.
Expanded Polyethylene (EPE) Foams
Expanded polyethylene foams have a high strength-to-weight ratio and good thermal resistance. This is because the foams are created using heat and pressure, which results in a beaded foam that can be molded and die cut. EPE foams are lightweight, non-abrasive, and can be recycled after use.
Extruded Polyethylene Foams
Extruded polyethylene foams are created using an extrusion process, which melts the polyethylene resin and feeds it through a mold after certain additives have been combined with the foam. EPE foams are known for their high insulation properties, light weight, and high durability.
Low-Density Polyethylene Foams
Low density polyethylene foams (LDPE) are created with gaps in their cellular structure, creating a foam that is less dense and therefore softer and more compressive. LDPE foams are ideal for packaging materials (for small, delicate items) as well as marine applications due to their buoyancy and resistance to moisture and water.
Need help choosing a polyethylene foam for your application? Get in touch with the foam experts at Amcon today. .