Ask Dr. Dave

Ask Dr. Dave: Can you help us with a crystallization problem in the part-A (epoxy side) of our two-part epoxy putty compound?

Epoxies tend to crystallize when they are very pure with narrow molecular weight distributions.
Dave Dunn's December 2014 column.
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Ask Dr. Dave: What are the best adhesives and sealants for construction these days?

Adhesives and sealants for the construction industry have changed dramatically over the last 20 years or so.

Dave Dunn's November 2014 column.


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Ask Dr. Dave: What are the best products for filling the seams after assembling acrylic countertops?

Reactive acrylic adhesives vary from surface-activated flexible adhesives to two-component adhesives.

Dave Dunn's October 2014 column.


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Ask Dr. Dave: What is the difference between a polyurethane adhesive and a polyurea adhesive?

Dave Dunn's September 2014 column
The most important difference is that the polyurea reaction is much faster than the polyurethane one.
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Ask Dr. Dave: Why are some waterborne adhesives called latex, others called dispersions and yet others emulsions?

Dave Dunn's August 2014 column.

Many companies use different terms to disassociate their water-based adhesives from adhesives based on natural latex.


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Ask Dr. Dave: How can we get our adhesives approved for food/beverage or medical applications?

Dave Dunn's July 2014 column.

Food packaging is an industry that involves special requirements.


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Ask Dr. Dave: What is the best way to judge the effectiveness of an adhesive bond?

Dave Dunn's June 2014 column.
It is a common misperception that the material should always break before the adhesive bond.
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Ask Dr. Dave: What is a good adhesive for bonding glass to metal?

Dave Dunn's May 2014 column.

 Bonding glass to metals can be done successfully, although it is often necessary to choose systems that have appropriate "adhesion promoters." 


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Ask Dr. Dave: Is there a way to bond PTFE with regular adhesives?

Dave Dunn's April 2014 column.

It is necessary to treat the surface aggressively with chemical agents.


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Ask Dr. Dave: How can we ensure that UV-curable adhesives are always fully cured?

Dave Dunn's March 2014 column.

 One never gets a full 100% cure of these thermoset systems at relatively low temperatures because molecular mobility goes down dramatically as the adhesive increases in viscosity during curing. 


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ExxonMobil Tackifier Expansion

Dwight Tozer, vice president of ExxonMobil’s Adhesion Industry business, discusses the company’s latest tackifier expansion project with Editor-in-Chief Susan Sutton.

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Adhesives & Sealants Industry Magazine

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2014 December

The annual Buyers' Guide is here! You won't want to miss this.

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Handbook of Sealant Technology

The Handbook of Sealant Technology provides an in-depth examination of sealants, reviewing their historical developments and fundamentals, adhesion theories and properties, and today’s wide range of applications.

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ASI 2014 Buyers GuideASI's Buyers' Guide

Annual purchasing resource for equipment used in the manufacture/formulation of adhesives, sealants, pressure sensitives, tapes and labels and for application of finished adhesives. 

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