The Ultimate Guide to Choosing hot melt adhesive pellets

July 28,

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There are several different formulations of hot melts with different properties and capabilities. Copolyester hot melt adhesives are one such type that is becoming a popular bonding solution in a variety of industries.

But how do you know when to choose a copolyester adhesive versus another hot melt? To help, our team has created this guide detailing the ins and outs of copolyester hot melts, including how they work, their common applications, and some product examples.

What Are Copolyester Hot Melt Adhesives?

Copolyester hot melt adhesives are a type of thermoplastic adhesive made from multiple polyester monomers. As a thermoplastic adhesive, they are solid at room temperature but will take a liquid form when heated. They are applied as a liquid and then solidify as they cool to form bonds. Copolyester hot melts are known for their great flexibility, durability, chemical resistance, and bond performance.

These adhesives can take many forms, including pellets and powder, and can be applied via various application methods depending on the form. They are commonly used in the textile, automotive, and packaging industries.

Pros

There are several benefits of copolyester hot melt adhesives, including:

• Good adhesives to various materials: Copolyester glues can be used to bond plastics, fabrics, foams, and other synthetic materials.

• Great flexibility and durability: Copolyester hot glues have great flexibility and are able to withstand stress or repeated movements.

• High resistance to various chemicals and elements: These adhesives tend to have a high resistance to solvents, oils, plasticizers, steam, water, and more.

• High temperature resistance: Not only do these adhesives have good chemical resistance, but they also have a high resistance to a wide range of temperatures.

• More environmentally friendly: Copolyester adhesives are solvent-free, low-odor, and low-VOC products. Together, these properties make them a more environmentally friendly solution than solvent-based adhesives.

• Good diversity of properties: These products can be formulated with different viscosities, set times, and forms to meet different application needs.

Cons

While there are many pros of copolyester hot melt adhesive glues, there are also some potential downfalls or limitations of hot melt copolyesters. Because of their many beneficial properties, copolyester hot melt glues can also be more expensive than other hot melts. Some copolyester adhesives may also not be suitable for difficult-to-bond plastics like PP or PE.

Learn more about the other Types of Hot Glue and which chemistry is right for you.

Common Applications for Copolyester Hot Melts

Thanks to their many beneficial properties, copolyester adhesives are used in a wide range of industries for different applications. Two of their more popular applications are described in further detail below.

Textiles & Apparel

One of the most common applications for copolyester hot melt adhesives is related to textiles and apparel. They are often used in technical apparel laminations, textile bonding, apparel construction, and more. They are also commonly laundry resistant adhesives with the ability to withstand elements they would be exposed to during the laundry cycle, including heat, steam, and water.

Automotive

These adhesives are also often found in the use of textiles in automotive interiors, especially related to back injection molding for automotive pillars and car interior door trims. They are designed to be strong, durable, and resistant to high temperatures so they can last the life cycle of the vehicle.

Choosing A Copolyester Glue

Even though copolyester adhesives have similar properties in general, every product is different with unique specifications. When picking a specific product, there are several factors you need to consider, including:

• Substrates being bonded

• Product form

• Application process and equipment

• Bonding strength

• Flexibility

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• Open time

• Environment

• Temperature resistance

• Regulatory needs

• Cost

All these factors and more can help you narrow down your choices so you can find the product that best meets your specific needs.

Still confused? One of our adhesive experts can provide you with a free, personalized product recommendation.

Hot Melt Copolyester Adhesive Examples

There are several copolyester hot melt adhesive glues on the market. Our team is highlighting a few top-tier products that you may want to explore for your application.

HM

This copolyester glue has a low activation temperature and an extended working time for larger bonding areas or applications that require more time to adjust components. It also has a high resistance to plasticizer migration, UV light, and moisture.

PES 680V Hot Melt

For flexible and soft touch film applications, this product can be a good choice. Based on the Shore hardness scale, this adhesive has a low hardness of D30. It also has a low glue line temperature that makes it more suitable for sensitive applications.

Bostik PES 594V

This Bostik copolyester hot melt is particularly well suited for flexible coatings and is commonly used to bond polybutylene terephthalate. It has a low melt viscosity of 25,000 cps for easy spreading and a glass transition temperature of 54°F. It comes in pellet form.

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September 12,

Hot melts are thermoplastic glues that are solid at room temperature. They are melted by heat to a liquid from and then applied to the substrate. The hot melt will then solidify to form a bond between the substrates.

Hot melt glues are a versatile type of adhesive that is particularly popular for packaging applications. They were created to solve the issue of water-based adhesives that were failing in humid environments.

The Different Types of Hot Melt Adhesives

Hot melts include a diverse collection of adhesives. There are several different kinds of hot melt glues, and each has their own advantages and disadvantages. If you are looking for a hot melt for your application, it is important to understand these differences to ensure you choose the right type of hot melt adhesive.

Ethylene Vinyl Acetate (EVAs)

EVA adhesives are the most common type of hot melt glue. They are a copolymer adhesive and bond well to cellulosic materials. As a result, they are commonly used in paper, packaging, and assembly applications.  

Compared to other kinds of hot melt adhesives, EVAs can bond to a more diverse number of substrates and have one of the widest temperature ranges. Even better, EVAs also tend to be the cheapest kind of hot melt.

Amorphous Poly Alpha Olefin (APAOs)

In their truest form, APAO hot melts are made up entirely of propylene, but they are also often combined with Ethylene or Butene-1 to change the characteristics of the adhesive. Compared to traditional hot melts, they are known for their high heat resistance. APAOs can also be formulated to have desirable properties like cold resistance and long open times.

Polyamides (PAs)

Polyamide hot melt adhesives are also known for their high heat resistance, but they can be expensive compared to other types of hot melt glues like EVAs. They also tend to have a high resistance to oil and chemicals, so they are desirable in applications where these properties are necessary such as in automotive assembly.

Polyurethane (PUR)

One of the biggest benefits of PUR hot melts are their great strength. Unlike traditional hot melts, PUR hot melts will react with moisture in the air and undergo a chemical change instead of just a thermal bond. As a result, the bond will continue to strengthen over the next 24 hours. This property makes them stronger than traditional hot melt, but they tend to also be more expensive.

Metallocene

Metallocene hot melts are made from metal-catalyzed polyethylene. What makes them unique is that they are less dense and voluminous than other hot melts. As a result, less glue is required to create an optimal strength and lasting bond. They also have a long pot life, produce minimal odor, and lead to little stringing.

Choosing the Right Type of Hot Melt Glue

Different hot melts have different purposes. Now that you know more about the different hot melt glue types, you may have a better idea of what you need for your application. You should keep in mind your production process, substrates, environmental factors, and budget. 

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