Adhesives for Potting Electronics
WHAT IS POTTING? Potting is essentially filling a “pot” with adhesive (or a potting compound). When potting electronics, the components to be potted are in a housing or recess which is then filled with adhesive. WHY POT? Electronic circuit boards comprise many sensitive small components such as microchips, resistors, transistors and diodes. These often require […]
Permabond 820 Temp. Resistant Instant Adhesive for Component Tacking
Permabond 820 quick-setting instant adhesive resists temperature ranges up to 200ºC (390ºF). Typical ethyl cyanoacrylates only resist temperatures to 82ºC (180ºF). Permabond 820 is a modified ethyl cyanoacrylate that has a fast fixture time and high-temperature resistance, making it an ideal choice when bonding components in position on dual-sided PCBs prior to wave soldering. Permabond […]
Understanding Adhesive Viscosity and Rheology
Most adhesive manufacturers list the viscosity of the uncured adhesive in their literature to help engineers determine which product is most suitable for a specific application and can be integrated into their production line most effectively. Temperature and shear (stirring or agitating) can affect adhesive viscosity and flow behavior. Therefore it is important to […]
High Temperature Adhesives & Heat Resistant Adhesives
Heat Resistant Adhesives Temperature Resistance Differential Thermal Expansion Thermal Cycle – Thermal Shock Why are some adhesives listed as high temperature resistant when they resist only 150°C, while others are classified as high temperature resistant and resist 300°C or more? The classifications are based on what typical temperature resistance is for that technology. For example, […]
Glossary of Cure Time Terms
Cure time, pot life, working life, working strength etc. What do they all mean? With so many terms and figures, curing time information can be very confusing… Here are some explanations for the common terms for adhesive cure time. Cure Time Terms Fixture time Normally this term is used for a very fast setting adhesive […]
How long will my adhesive bond last?
This is a difficult question. Permanent engineering or structural adhesive bonds should last the useful lifetime of the parts. It’s impossible to say, “in seventeen years, five months, and three days’ time, your adhesive bond will fall apart.” But will the adhesive bond last indefinitely? Exceptions to Permanent Adhesive Bonds There are some exceptions to […]
The Importance of Clamping During Adhesive Cure
There are several reasons why clamping during adhesive cure is important. Firstly, and most obvious, is to prevent the components falling apart whilst the adhesive is curing. Adhesives have different cure speeds. Some products (e.g. cyanoacrylates) cure in seconds and can be easily held by hand until handling strength is achieved. Handling strength is the […]
Structural Adhesives – Tough, Reliable and Multipurpose
What are Structural Adhesives? Adhesives are classified in many ways, usually based on their chemical composition. Different classes include cyanoacrylate, epoxy, acrylic, urethane, etc…. Sometimes they’re described by how they cure, like UV curable, pressure sensitive, moisture curable, two-component, or heat curable. The term “structural adhesive” refers to the adhesive’s role as part of the […]
Bonding Agents for Packaging and Processing
We receive a lot of requests for advice in permanent bonding in one or two stages in the context of packaging and processing. The use of bonding agents in these areas is based on a range of practical considerations regarding improving procedures and problem solving. A good example is a replacement parts manufacturer which found […]
Anaerobic threadlockers – Permabond
Anaerobic threadlockers are anaerobic adhesives that lock fasteners in place. Their role is to prevent loosening due to vibration, thermal expansion or other stresses. Anaerobic threadlockers also permit safe removal of the fastener. Strange as this may seem at first glance, the most important need is to protect the fastener against damage during the removal […]
How to increase the usable life of your Super Glue
How many times have you gone to fix something, delved into the depths of your tool shed, located your super glue and then discovered it has gone solid in the tube or bottle? More often than not probably! There are a lot of different “species” of this type of glue, which is technically called a […]
Bond it, don’t break it! The benefits of using UV adhesives on glass
Drilling holes and cutting notches in glass panels is a specialist and skilled operation. It often involves a third party, extra processing time, transportation and cost. Not to mention the risk of breakage. UV-cure adhesives can remove the headache from fitting door handles, hinges, extrusions, and various fixtures and fittings to glass panels.
