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Home » Topics » Columns » Ask Dr. Dave

Ask Dr. Dave
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ask dr dave dunn

Ask Dr. Dave: What advantages do I have if I choose an adhesive that has MIL-SPEC approval?

If you buy an adhesive or sealant that has MIL-SPEC approval, it means the product has passed certain performance specifications.
Dunn95
Dave Dunn Ph.D.
February 2, 2015
No Comments

Dave Dunn's February 2015 column.


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ask dr dave dunn

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.
December 11, 2014
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Dave Dunn's December 2014 column.
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ask dr dave dunn

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.
November 1, 2014
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Dave Dunn's November 2014 column.


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ask dr dave dunn

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.
October 1, 2014
No Comments

Dave Dunn's October 2014 column.


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ask dr dave dunn
Ask Dr. Dave

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

Dave Dunn's September 2014 column.
Dunn95
Dave Dunn Ph.D.
September 2, 2014
No Comments
The most important difference is that the polyurea reaction is much faster than the polyurethane one.
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ask dr dave dunn

Ask Dr. Dave: Why are some waterborne adhesives called latex, others called dispersions and yet others emulsions?

Dave Dunn's August 2014 column.
August 1, 2014
No Comments

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


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ask dr dave dunn

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

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

Food packaging is an industry that involves special requirements.


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ask dr dave dunn

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

Dave Dunn's June 2014 column.
Dunn95
Dave Dunn Ph.D.
June 2, 2014
No Comments
It is a common misperception that the material should always break before the adhesive bond.
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asi0412-DrDave-img-feature.jpg

Ask Dr. Dave: What is a good adhesive for bonding glass to metal?

Dave Dunn's May 2014 column.
Dunn95
Dave Dunn Ph.D.
May 1, 2014
One Comment

 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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asi0412-DrDave-img-feature.jpg

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

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

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


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