aside to cure offline, taking up space and resources like jigs and tooling. Adhesives that have purely thermal cures will require some sort of oven, which carries both an upfront cost and an ongoing energy expense. Ideally, the cure time will fit into production speeds and takt times, to avoid creating bottlenecks or large amounts of work in progress. There are rapid curing adhesives available, such as cyanoacrylate adhesives and UV curable materials. But while these may be attractive from a process perspective, they are not always suitable from a performance or process angle.
If your team will be handling the material, it is important to consider whether the adhesive will introduce additional health and safety requirements. Some processes may carry an increased risk of RSI, such as if a team member has to use excessive force to remove the material from its package. In this example, one potential solution is to switch to a pneumatic system. Alternatively, consider switching to an alternative material that is easier to handle. Always review the latest Safety Data Sheet as part of the adhesive selection process. You will need to establish whether ventilation is needed,
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what PPE is required, and if there are any pertinent regulations. For example, from August 2023, users of polyurethane adhesives with a monomeric diisocyanate concentration of 0.1% require training. If the health and safety issues are a concern, you could trial alternative materials – Point One structural polyurethane adhesives, for example, use micro emission technology and therefore require no training. Typically, the fewer processes that need to be done by hand, the better. A machine that metres and mixes through a nozzle offers better repeatability and health and safety than an operator doing it by hand.
An understanding of expected production quantities can impact adhesive choice with regard to cure time, dispensing method and even packaging. What works to make one component might look different from 100, and different again from 100,000. If it is likely production will scale up, the design engineer may wish to specify a material that is readily automatable, so that higher throughput and volume can be achieved. Certain materials can be packaged for both hand application and in bulk, which can make the transition easier. For
example, the two-part clear potting polyurethane Opti-tec 4200 is available in easy-to-use 50ml cartridges and also in bulk kits of at least 1kg. If you are looking to scale up a process later, your adhesives supplier can help you take an
incremental approach, so that your current investment works as part of your future one. Considering the processability of an
adhesive at the design stage greatly reduces the chance of hurdles later down the line.
ISO 10993 LED UV Light Curing Adhesives
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