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Category Archives: Troubleshooting

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 ensures...

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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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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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Factors Affecting UV-Cure

UV-curable adhesives are single-part  products which cure in seconds when exposed to UV-light. They are normally optically clear for “invisible” bonding of glass and certain plastics and cure to form a high-strength, non-yellowing bond.  They are convenient to use by hand or on fully automated high-speed production lines  due to their rapid on-demand cure mecha...

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Troubleshooting – Operator Influence

Even in highly automated processes, machinery operators can still have a sizeable influence on the success and effectiveness of their machinery’s operation. However clear and well-written an instruction manual may be, wherever humans are involved, there is always going to be room for variation, making it important to find ways for various operators to be on the same pag...

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How do I avoid stress cracks when bonding plastics?

Stress cracks occur when the short-term mechanical strength of a plastic is subjected to adverse forces. Reducing or preventing stress cracks is accomplished with a careful design of compatible substrates and consistent manufacturing and assembly processes. There are several areas to consider when looking for the cause of stress cracks in plastic components. Manuf...

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How do I prevent white powdery residue when using instant adhesives?

Frosting – Blooming – Chlorosis – Whatever you call it, we all recognize it as the unattractive white stuff that can sometimes occur when using instant adhesives. The residue is a byproduct of the cure process of the adhesive. Once the monomer is in vapor form, it will react with moisture in the air, cure, and settle on the surface around the bond area. (more&h...

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