{"id":1798,"date":"2011-08-17T06:59:45","date_gmt":"2011-08-17T06:59:45","guid":{"rendered":"https:\/\/permabond.com\/importance-clamping-adhesive-cure\/"},"modified":"2025-05-02T20:10:41","modified_gmt":"2025-05-02T20:10:41","slug":"importance-clamping-adhesive-cure","status":"publish","type":"post","link":"https:\/\/permabond.com\/es\/importance-clamping-adhesive-cure\/","title":{"rendered":"The Importance of Clamping During Adhesive Cure"},"content":{"rendered":"

There are several reasons why clamping during adhesive cure is important.<\/p>\n

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<\/a>) cure in seconds and can be easily held by hand until handling strength is achieved. Handling strength is the point at which the bond holds itself together firmly enough to be lightly handled. Other products such as epoxies, can take several hours. It might get a bit boring and uncomfortable holding a joint by hand for this long!\u00a0 RTV silicones can even take days. Although many of these types of products have a high initial \u201cgrab\u201d strength which tends to hold the joint fairly well without clamping, providing it is not in a load-bearing joint.<\/p>\n

<\/p>\n

Clamping Different Adhesive Types<\/h3>\n

Many adhesives act as lubricants when in their liquid state. Which is quite helpful if you\u2019re trying to screw parts together. However, unsupported joints with liquid adhesive will be very prone to slipping out of alignment or even apart completely. For this reason, it is a good idea to clamp parts to stop this movement.\u00a0\u00a0 High-viscosity single part heat cure epoxy<\/a> adhesives don’t present as slippery. However, they can become slippery when heated up in the curing oven. So even if you don\u2019t think the parts will slide apart, err on the side of caution and clamp together during cure.<\/p>\n

UV-curable adhesives<\/a> can be quite challenging to secure as a clamp will effectively create a shadow area which won\u2019t cure properly. It is very important that if you cure in two stages (so removing the clamp halfway through to cure the shadow area) that you are not premature with the removal of the clamp, the joint can accidentally \u201cpant\u201d open slightly and suck in air around the edges, this can lead to a \u201ccrazy paving\u201d effect. This is easily prevented by increasing the length of time the assembly is exposed to the UV light or increasing the intensity to enable a faster cure.<\/p>\n

Disturbing a joint during initial cure is not a good idea as a similar thing can happen with all adhesives, the joint can \u201cpant\u201d open and air can suck in. This reduces the joint strength and in the case of two part no-mix acrylic adhesives, \u201cpanting open\u201d can actually affect the product cure.\u00a0 To prevent this happening, do not disturb the joint until it has reached its handling time (which is normally listed on a product\u2019s technical datasheet).<\/p>\n

Clamp Types<\/h3>\n

Clamps can be very basic and cheap \u2013 bulldog clips are quite good for simple joint configurations. Of course, many joints are quite complex or the substrates are too thick to use a stationery clip. More heavy duty G-clamps could be the order of the day for larger assemblies or specially-made jigs may be necessary.\u00a0 Clamping for long periods can delay production or take up a lot of room in a production facility. So it is worth exploring the option of using a quicker curing adhesive. Many can offer the strength performance benefits required for your application but help reduce clamping time.<\/p>\n

For more help and advice, please contact <\/a>Permabond.<\/p>\n","protected":false},"excerpt":{"rendered":"

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 […]<\/p>\n","protected":false},"author":6,"featured_media":11855,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[607,612],"tags":[42,75],"class_list":["post-1798","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-adhesive-selection-and-use","category-tips","tag-adhesives","tag-epoxy"],"acf":[],"yoast_head":"\nThe Importance of Clamping During Adhesive Cure<\/title>\n<meta name=\"description\" content=\"There are several reasons why clamping during adhesive cure is important. 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