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4 Things to Consider When Choosing an Adhesive


4 Things to Consider When Choosing an Adhesive

Adhesives come in a variety of chemistries and forms, and each has unique features that are formulated to solve a particular problem or need. Science has allowed for engineering very specific adhesives, and they tend to come in polar opposites: solvent or acrylic, clear or pigmented, removable or permanent. 

From epoxy to thread lockers, and everything in between, choosing the correct adhesive for your project comes down to the application it will be used for and the environment in which it will be applied. 

To get the best results, ask yourself the following questions before selecting your adhesive: 

Surface Type

What surface, container or product will the adhesive be applied to?

Adhesives attach to the surfaces of two substrates, unlike a process that fuses substrates into a unified whole such as welding metal or solvent activation of plastics. In selecting a GlueGun.com adhesive, surface condition must be considered: roughness, smoothness, porosity, coated, uncoated, cleanliness, flexibility, and size of the part. Check out our Surface Preparation Tips and Tricks for adhesive bonding. 

Not every adhesive will work on every surface. For example, polyurethane adhesives are an excellent choice for finish carpentry and other woodworking projects, as they provide durability, impact resistance and flexibility in open times.

Pressure sensitive adhesives (PSAs) adhere to most surfaces, and contact adhesives are particularly well-suited in applications where clamping is difficult. 

Some adhesives, like epoxies, require thorough surface preparation (cleaning, roughening) in order to adhere properly. MMA's would be better for metal bonding in general because they require little or no surface preparation. 

Hot melt glue sticks and bulk hot melt excel at bonding porous materials such as paper, cardboard, wood, as well as some plastics. 

 

Shop Hot Melt Glue Sticks                             Shop Bulk Hot Melts

Infinity Bond InfinityPack Premium Packaging Glue Sticks

Power Adhesives TEC Bond 7731F Bulk Hot Melt

Power Adhesives TEC Bond 7731F Bulk Hot Melt

$50.00

Infinity SuperTAC 11 Product Assembly Bulk Hot Melt

Infinity SuperTAC 11 Product Assembly Bulk Hot Melt

$150.00

Temperature

What temperature will the adhesive endure or be exposed to during use, distribution and storage?

Many environmental conditions affect how adhesives cure and perform over long periods of time. One of the most significant environmental factors is temperature. Minor changes in temperature can have major changes in cure speed and storage life of adhesives. Most organic adhesives have maximum continuous operating temperatures and if exposed to higher temperatures for long periods of time their performance drops significantly. 

Thermosetting adhesives such as melamine, phenolic and formaldehyde resins form strong bonds and have good resistance to higher temperatures. Silicone adhesives have a high degree of flexibility as well as a very high temperature resistance, making them excellent choices for marine or plumbing applications. As a rule, curing will be slower at lower temperatures and faster at higher temperatures. 

Shop Silicone Adhesives & Sealants

ASI 600 High Temperature Red Gasket Maker Silicone

ASI 600 High Temperature Red Gasket Maker Silicone

$80.00

ASI 335 Neutral Cure Window Silicone Sealant

ASI 335 Neutral Cure Window Silicone Sealant

$102.00

Vibra Tite 992 Copper RTV Gasket Maker Silicone

Vibra Tite 992 Copper RTV Gasket Maker Silicone

$54.00 

Adherence Strength & Tack

Will the adhesive need to be one that forms a strong, permanent bond, or one that allows the joined surfaces to be removed or re-positioned as needed?

Adhesive strength is the interfacial strength between adhesive and substrate, and usually the most important consideration when designing a strong adhesive bonded assembly. However, adhesive strength is not the only factor critical to creating an effective bond. Even when using the world's toughest adhesive, a bond will fail if the adhesive does not bond to the surface of the substrate.

Water-based adhesives are commonly used for laminating, they're also a lower cost alternative to resins. Hot melt adhesives can be melted or softened repeatedly by heat, or set by cooling, which allows for re-positioning during assembly. Often, removable adhesives are used as positioning aids during product build. 

Polyurethane hot melt, more commonly known as PUR, is an adhesive that shares many characteristics of traditional glue sticks and bulk hot melt. That said, PUR hot melt is not dispensed in a traditional glue gun and can offer some additional bonding attributes that may fit applications that require a stronger bond or higher endurance to the elements. 

Shop PUR Hot Melt Adhesives

Infinity PUR WW30 Woodworking Polyurethane Adhesive

Infinity PUR WW30

$12.00

Infinity Bond 1361 PUR Cartridge Gun - HiPURformer Replacement

Infinity Bond PUR Cartridge Gun

$90.00

Infinity PUR WW60 Woodworking Polyurethane Adhesive

Infinity PUR WW60 

$12.00

Humidity

Will the adhesive be exposed to high humidity during end use, application or distribution?

Excessive humidity can cause adhesives to become more foamy in appearance or softer in quality. It can also result in film formation in certain curing agents. Some adhesives may not be affected by humidity within a certain range, but if condensation forms on top of a substrate, you can be assured that the bond strength will be negatively impacted. 

Moisture and humidity will both have an effect on adhesion performance. Acrylic adhesives have excellent environmental resistance but because they are water-based, they are more susceptible to moisture which affects their application and durability aspects. When it comes to humidity, when it's low, drying is accelerated; when high, drying is slower. 

Shop Structural Adhesives

3M DP460 Super High Performance Epoxy

3M DP460 Super High Performance Epoxy

$257.00

ASI MP 55300 General Purpose MEthacrylate (MMA) Adhesive

ASI MP 55300 General Purpose MMA Adhesive

$14.98

Loctite H8000 Acrylic Adhesive - Metal Bonder

 Loctite H8000 Acrylic Adhesive - Metal Bonder

$159.80

 

Adhesive Testing

Even after all of these questions are answered, there's no guarantee a particular adhesive will perform exactly as you need it to. Adhesive testing is strongly recommended prior to production or purchase. When testing, some factors affecting bond strength you'll want to consider include:

  • Test temperature
  • The adhesive contact area
  • Type of force applied
  • The adhesive's properties
  • Adhesion to substrates
  • Prior or subsequent exposure to heat or moisture
  • Storage, complex and loss modulus

Contact Us

At GlueGun.com we offer quality products and deliver great customer service in equal measure; our experienced professionals guarantee it. 

If you have additional questions, or would like more information on the use of adhesives, custom formulations or application products, contact us for more information