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Troubleshooting

What is Permabond 2K Primer and Adhesion Promoter

Permabond 2K Primer is a multi-purpose product.  It is ideal for preparing substrates for bonding, identifying if the surface is wetting out properly or if additional surface preparation is needed.  It contains an adhesive promotor to increase bond strength.  It is ideal for preparing metal, glass, plastic, and composite for bonding.  When bonding meta...

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Why didn’t my thread sealant cure?

Anaerobic thread sealant (pipe sealant) fills all of the voids or airspace between metal threads creating a permanent plastic seal.  They do not shrink or relax over time. Anaerobic adhesives and sealants require only two conditions to cure. They are 1. The presence of metal ions and 2. The absence of oxygen.  Seems easy enough right?  Yes and no.  Fo...

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How to prevent stress cracking

  What is stress cracking? When force is applied to plastic, it travels along the polymer chains causing molecules to strain to remain in contact.  The polymer chains eventually creep toward the pull and deform.  This stage is called creep.  With force and time, crazing or stress cracking occurs.  Adding chemicals or temperature can speed the process. Factors affe...

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How to eliminate air from adhesive and remove air from a bond joint

With the exception of Great Aunt Tilly, we don’t exist in a complete vacuum.  Air is everywhere and often finds its way into an adhesive bond joint.  It goes without saying that adhesive bonds better than air – so minimizing or eliminating air bubbles is essential to achieving the strongest bond.  It is also important to eliminate air if you desire a full seal – ...

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When adhesives exotherm….

What is an exothermic reaction? When chemicals react with each other they often give out heat during the reaction. This is known as an exotherm and it is something that is often witnessed when mixing adhesives (e.g. resin and hardener systems such as two-part epoxy adhesives) or sometimes when curing too much adhesive in one go (such as placing a bulk quantity of heat cu...

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Heat cure epoxy – making sure the adhesive is properly cured

What is epoxy adhesive? Single part epoxies contain both resin and hardener in the one mixture (unlike 2 part epoxies where they are packaged separate and mixed before use).  The curing mechanism of heat cure epoxy is activated when exposed to high temperature and cures the adhesive.  Continued exposure to heat enables cross linking of polymers as they form and ...

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Glass bonding – Troubleshooting

When Glass Bonding Goes Wrong… Adhesive won’t stick, it is coming clean off the glass: Check surface preparation Joint design – if you have a butt joint this can be problematic as this introduces peel or cleavage stress into the joint. Try to redesign the joint to minimize the peel stress.  You can also build up a fillet or meniscus of adhesive around the ...

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Anaerobic Adhesive: Curing Considerations & Speeds

How Do Anaerobic Adhesives Work? It is a puzzle, they stay liquid in the bottle, you tip them out and they remain liquid and don’t appear to dry.  They are non-tacky to the touch. How can they possibly be an adhesive?! Well, the cure mechanism of an anaerobic adhesive (or anaerobic sealant as they are often referred to) is triggered when it comes into contact with...

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Maximum Gap Fill of Adhesive

Maximum Gap Fill Maximum Gap Fill of the adhesive is often stated on the technical data sheet, but what does it mean? The Maximum Gap Fill of an adhesives may be related to cure depth, bond strength, viscosity or a combination of the three. Maximum Gap Fill as it relates to Cure Depth Some adhesives require activation by either moisture, activator, or in the case of anaer...

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Troubleshooting Single-part Epoxy Adhesive Dispensing Problem

Manual Dispensing from Cartridge On many epoxy adhesive cartridges, there is a strong plastic stopper. The stopper must be cut with a sharp Stanley knife (or similar implement) before affixing the dispensing nozzle. The dispensing nozzle is normally supplied with the adhesive. Typically, 320ml cartridges fit in regular caulking guns. However, certain epoxy adhesive pr...

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