{"id":1551,"date":"2015-04-08T01:33:01","date_gmt":"2015-04-08T01:33:01","guid":{"rendered":"https:\/\/permabond.com\/anaerobic-adhesive-curing-considerations\/"},"modified":"2024-09-03T13:23:57","modified_gmt":"2024-09-03T13:23:57","slug":"anaerobic-adhesive-curing-considerations","status":"publish","type":"post","link":"https:\/\/permabond.com\/es\/anaerobic-adhesive-curing-considerations\/","title":{"rendered":"Anaerobic Adhesive: Curing Considerations & Speeds"},"content":{"rendered":"

How Do Anaerobic Adhesives Work?<\/h2>\n

How do anaerobic adhesives cure? It is a puzzle, they stay liquid in the bottle, you tip them out and they remain liquid and don\u2019t appear to dry.\u00a0 They are non-tacky to the touch. How can they possibly be an adhesive?!<\/p>\n

Well, the cure mechanism of an anaerobic adhesive (or anaerobic sealant as they are often referred to) is triggered when it comes into contact with a metallic surface. This will cause the anaerobic adhesive to gel and cure. To facilitate full cure, the anaerobic adhesive needs to have exclusion of oxygen in combination with contact with a metal. With both these boxes ticked, the reactive molecules inside the liquid adhesive become activated, which triggers the curing mechanism, causing the monomers to polymerize and create a solid.<\/p>\n

Anaerobic adhesives<\/a> and sealants come in a variety of strengths to suit the application requirements.\u00a0 They are generally fairly rigid with a high tensile and compressive strength making them ideal for threadlocking nuts and bolts, retaining bearings into housings, gasketing between two metal flanges or pipe sealing threaded pipe joints. They are less suited to structural bonding, where there could be large flat areas for bonding where flexibility or peel forces acting on the joint.<\/p>\n

Factors Affecting Cure Speed<\/h2>\n

Firstly gap fill \u2013 due to the fact air must be excluded from the joint for the adhesive cure mechanism to kick in, it means that component parts must be close fitting.\u00a0 Anything larger than 0.5mm (0.02\u201d) is going to be a problem, as too much air is floating around, wreaking havoc!\u00a0 With this in mind, consider too that the interface of the joint where the anaerobic adhesive meets the outside world will remain liquid and wet to the touch (this often gives the impression that the industrial adhesive hasn\u2019t cured but the adhesive inside the joint has cured).\u00a0 Uncured surface adhesive can be easily washed off and shouldn\u2019t cause a problem inside pipework, valves or injector nozzles.\u00a0 Specialty grades of industrial adhesives are available for hydraulic systems.<\/p>\n

Temperature also affects speed – Chemical reactions are normally affected by temperature \u2013 if you increase the temperature, the molecules inside the liquid go crazier and will cause a faster cure! Generally, an increase of 8\u00b0C will cause the anaerobic adhesive to cure twice as quickly.<\/p>\n

Lastly, the reactivity of the surface \u2013 the type of metal being bonded or sealed will factor heavily in the cure speed of an anaerobic adhesive.<\/p>\n\n\n\n\n
Super Active<\/strong><\/td>\nActive<\/strong><\/td>\nLess Active<\/strong><\/td>\nPassive<\/strong><\/td>\n<\/tr>\n
\n
Copper<\/address>\n
Brass<\/address>\n<\/td>\n
\n
Steel<\/address>\n
Nickel<\/address>\n
Iron<\/address>\n
Aluminium<\/address>\n
Zinc<\/address>\n<\/td>\n
\n
Anodized aluminium<\/address>\n
Cadmium finishes<\/address>\n
Chrome finishes<\/address>\n
Passivated metals<\/address>\n
Stainless steel<\/address>\n
Titanium<\/address>\n<\/td>\n
\n
Ceramics<\/address>\n
Glass<\/address>\n
Plastics<\/address>\n
Painted finishes<\/address>\n
Lacquered finishes<\/address>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

At normal room temperature, a general purpose threadlocker would typically take 10-15 minutes to cure on steel, less than 5 minutes to cure on copper, but significantly longer on less active surfaces. Some users choose to use a surface activator on low-activity and passive surfaces. These work by leaving a microscopic film of copper on the surface (which is of course highly reactive) and trick the industrial adhesive into curing.<\/p>\n

Troubleshooting \u2013 Why is my anaerobic adhesive not curing?<\/h2>\n

1)\u00a0\u00a0\u00a0\u00a0\u00a0 Check that the joint is properly sealed \u2013 if the gap is too big or there is too big a surface area in contact with the air, the industrial adhesive will remain liquid<\/p>\n

2)\u00a0\u00a0\u00a0\u00a0\u00a0 Is your surface active enough?\u00a0 Sometimes metal alloys are quite inactive, and the anaerobic adhesive will take longer to cure. Using an activator or heating the parts will speed the adhesive up<\/p>\n

3)\u00a0\u00a0\u00a0\u00a0\u00a0 Sometimes, it is hard to see, but surfaces may have a lacquer coating. This stops the industrial adhesive from coming into contact with the metal beneath, thus preventing cure. If this is the case, or if you have a painted surface, it is best to remove the lacquer or paint before bonding. This will also help you achieve higher bond strength performance<\/p>\n

For further help and information on bonding an anaerobic adhesive, please contact the Permabond technical team here<\/a>.<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

How Do Anaerobic Adhesives Work? How do anaerobic adhesives cure? It is a puzzle, they stay liquid in the bottle, you tip them out and they remain liquid and don\u2019t appear to dry.\u00a0 They are non-tacky to the touch. How can they possibly be an adhesive?! Well, the cure mechanism of an anaerobic adhesive (or […]<\/p>\n","protected":false},"author":5,"featured_media":11855,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[607,612],"tags":[49,162,163,164],"class_list":["post-1551","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-adhesive-selection-and-use","category-tips","tag-anaerobic-adhesives","tag-cure-speed","tag-sealants","tag-surface-reactivity"],"acf":[],"yoast_head":"\nCure Anaerobic Adhesive | Metal Bonding Adhesive | Permabond<\/title>\n<meta name=\"description\" content=\"How do anaerobic adhesives cure? 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