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The 3M 7010367620, sold as Scotch-Weld Anaerobic Activator AC649, is a one-part surface activator formulated to accelerate the cure of anaerobic adhesives on inactive metal substrates. It ships in an 8 fl oz container and is California-compliant for VOC content. AC649 is applied to base materials before or alongside anaerobic adhesives to initiate and speed the curing reaction, particularly on surfaces that would otherwise slow or inhibit cure. Licensed plumbers, pipefitters, millwrights, and maintenance technicians working with threaded fasteners, press-fit assemblies, and bonded metal joints use this activator as part of a standard anaerobic bonding workflow.
AC649 is designed for use on inactive metals that do not generate sufficient ionic activity to trigger fast anaerobic cure on their own. Common applications include plated parts, anodized aluminum components, stainless steel fittings, and galvanized steel surfaces. It is well suited for residential and commercial maintenance, OEM assembly lines, and field service work where anaerobic threadlockers, retaining compounds, or pipe sealants are used on passive metal surfaces requiring a reliable and consistent cure rate.
Designed for use with anaerobic adhesives applied to inactive metal substrates such as plated parts, anodized aluminum, stainless steel, and galvanized steel. Refer to the adhesive manufacturer's data sheet to confirm suitability with a specific anaerobic product or assembly.
Apply AC649 to clean, dry metal surfaces prior to or in conjunction with the anaerobic adhesive per the adhesive product's documented procedure. Ensure adequate ventilation during application, as activator solvents require airflow per local safety regulations. Allow the activator to flash off before applying the adhesive unless the product instructions specify simultaneous application. Store the container sealed and away from heat sources when not in use.
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