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Too low a temperature can cause the polymeric adhesive to enter its glass state becoming very brittle and reducing adhesion. [14] Raising the temperature, on the other hand, causes the polymer to become more fluid and mobile. As the mobility increases, the polymer adhesion is reduced as the polymer starts to flow as opposed to adhere.
The same applies to coated items. The adhesive must build adhesion to the coating. The coating in turn must be sufficiently firmly connected to the substrate. Likewise, contaminants, especially those which, due to their low surface tension, counteract wetting by the adhesive (for example, oils, release agents, etc.) hinder the adhesion ...
Adhesives may be broadly divided in two classes: structural and pressure-sensitive. To form a permanent bond, structural adhesives harden via processes such as evaporation of solvent (for example, white glue), reaction with UV radiation (as in dental adhesives), chemical reaction (such as two part epoxy), or cooling (as in hot melt).
D3330 Standard Test Method for Peel Adhesion of Pressure-Sensitive Tape EN 1939 PSTC-101 AFERA 5001 D3654 Standard Test Methods for Shear Adhesion of Pressure-Sensitive Tapes EN 1943 PSTC-107 AFERA 5012 D3759 Standard Test Method for Breaking Strength and Elongation of Pressure-Sensitive Tapes EN 14410 PSTC-131 AFERA 5004
In the paint and coating industries, paint adhesion testing is often used to determine if the paint or coating will adhere properly to the substrates to which they are applied. Several tests measure the resistance of paints and coatings from substrates: cross-cut test, scrape adhesion, pull-off test , and others.
A pull-off test, also called stud pull test, is a type of test in which an adhesive connection is made between a stud and a carrier (or object to be tested) by using a glue, possibly an epoxy or polyester resin, that is stronger than the bond that needs to be tested.
A release agent (also mold release agent, release coating, or mold release coating) is a chemical used to prevent other materials from bonding to surfaces. Release agents aid in processes involving mold release, die-cast release, plastic release, adhesive release, and tire and web release. [ 1 ]
Thread-locking fluid may be applied before or after assembly, depending on the type. Threadlockers are available in varieties of "permanent", "removable", and "low-strength" formulas. Many brands color-code the container and the fluid itself to indicate the degree of permanency.