EVA vs Metallocene – Hot Melt Comparison

August 13 2019

Action Adhesives are leaders in the Industrial Adhesives market in Ireland. Our technical team have assembled the most comprehensive range of top quality hot-melt products based on over 20 years’ experience.

What are Hot Melts?

Hot Melt Adhesives are solid materials that melt at relatively low temperature (typically above 80°C). They are typically applied between 125°C to 177°C. Once cooled, the materials become solid again, ensuring cohesion and the ultimate adhesion of the bonded surfaces.

Properties of Hot Melt Adhesives

The main properties of hot melt adhesives are:

In most cases, a prescribed amount of hot fluid adhesive is applied to the surface to be bonded. It is brought into contact with the surface to be bonded and compression is applied.  After the adhesive has cooled below its solidification point, the substrates are bonded. This process is illustrated below:

Hot Melt Bonding

Hot Melt Bonding

Hot Melts typically are composed of four main ingredients.

Here we will focus on the two main types of backbone polymers used in the majority of Packaging Hot Melts used today. They are EVA and mPO (commonly known as Metallocenes).

What is EVA?

EVA, or ethylene vinyl acetate copolymer, has been the mainstay and workhorse of packaging hot melts for well over 50 years now. EVA can be easily formulated with a wide variety of materials for very specific markets that often have unique needs. Examples can include food packaging that needs adhesion in blast freezer conditions as low as -40°C or conversely, shipping packages that may see temperatures in excess of 70°C in transit. Substrates from simple paper to wax or plastic coated substrates can be adhered depending on the specific EVA formulation.

What is Metallocene?

Metallocene, or mPO polymers, are relatively new to packaging hot melts. The first viable adhesives made with these polymers hit the market in the mid to late 1990’s. They offer some unique advantages over EVA formulations.

Metallocenes offer:

While it might seem at first glance that Metallocenes would be preferable to EVA hot melts, this is not always the case. Each has their place in the industry.

Industry uses for Hot Melt Adhesives & Metallocene

Some typical areas where you will find use for EVA or Metallocene hot melts are listed below:

Summary

If you think a hot melt might be suitable for your business, contact our team for expert guidance. Our adhesive experts will review your unique situation and help you decide which hot melt makes the most sense for you.

We have a combined experience of 75 years in the Industrial Adhesives packaging industry. We can offer an audit your line, run tests on your substrates and offer you the most economically effective solution to your adhesive needs.

See our Range of Hot Melt Adhesives HERE

 

 

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Hot Melt Equipment

Interested in hot melt adhesives, but don’t have the equipment? Have the equipment, but technical issues slowing progress? Our team are the official distributor of Meler hot melt equipment. For more information visit www.hme.ie

Hot Melt Equipment