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Home » Topics » Columns » Ask Dr. Dave

Ask Dr. Dave
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ask dr dave dunn

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

Dave Dunn's March 2014 column.
Dunn95
Dave Dunn Ph.D.
March 1, 2014
No Comments

 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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ask dr dave dunn

Ask Dr. Dave: Could you please give us an overview of polyurethane adhesives?

Dave Dunn's February 2014 column.
Dunn95
Dave Dunn Ph.D.
February 1, 2014
No Comments

 It’s important to understand that the term polyurethane covers a wide range of systems. 


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ask dr dave dunn

Ask Dr. Dave: How should I choose between an acrylic adhesive and an epoxy?

Dave Dunn's January 2014 column.
Dunn95
Dave Dunn Ph.D.
January 2, 2014
No Comments

 Both types of adhesives are very versatile; the choice depends on your operating environments and manufacturing situation. 


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ask dr dave dunn

Ask Dr. Dave: December 2013

Are all cyanoacrylate adhesives brittle when cured?
Dunn95
Dave Dunn Ph.D.
December 2, 2013
No Comments

Question: I am trying to bond several rubber parts together. I would like to try a cyanoacrylate adhesive, but I hear they are very brittle when cured. Is that true?


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ask dr dave dunn

Ask Dr. Dave: November 2013

Are epoxy adhesives with short cure times strong and durable?
Dunn95
Dave Dunn Ph.D.
November 1, 2013
No Comments

QUESTION: I see many so-called “five-minute” epoxy adhesives (and sometimes ones with even shorter cure times). Are these adhesives truly strong and durable?


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ask dr dave dunn

Ask Dr. Dave: October 2013

We want to bond steel to foamed polystyrene in large bond areas.
Dunn95
Dave Dunn Ph.D.
October 1, 2013
No Comments

QUESTION: We want to bond steel to foamed polystyrene in large bond areas, and we want to use a cost-effective adhesive that doesn’t take long to dry. Is a hot melt the way to go?


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ask dr dave dunn

Ask Dr. Dave: September 2013

Is it true that epoxy adhesives contain the same BPA that has been shown to be harmful when used to make drinking bottles?
Dunn95
Dave Dunn Ph.D.
September 5, 2013
No Comments

Is it true that epoxy adhesives contain the same BPA that has been shown to be harmful when used to make drinking bottles?


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ask dr dave dunn

Ask Dr. Dave: August 2013

How can we feel comfortable when changing to a new adhesive supplier?
Dunn95
Dave Dunn Ph.D.
August 5, 2013
No Comments

QUESTION: The adhesives we use are now available from more than one supplier. How can we feel comfortable when changing to a new supplier?


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ask dr dave dunn

Ask Dr. Dave: July 2013

Can you suggest ways to improve an adhesive system in terms of moisture/water sensitivity?
Dunn95
Dave Dunn Ph.D.
July 1, 2013
No Comments

QUESTION: We are successfully structurally bonding Belgian Blue Stone—also called Petit Granit (a non-porous limestone material)—with a two-component epoxy in an industrial process.


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ask dr dave dunn

Ask Dr. Dave: June 2013

How can we get some of our sealants approved for drinking water applications?
June 3, 2013
No Comments

QUESTION: We would like to get some of our sealants approved for drinking water applications. How can we do this?


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