The nuts and bolts of confident bonding 14 September 2021

UK-based Bondloc manufactures industrial adhesives and sealants with over 2,000 adhesive formulations in its portfolio But why is anaerobic chemistry still such an integral part of engineering and maintenance today?

Threaded fasteners were invented more than 2,000 years ago and are still widely used in machinery design and assembly, although usage is declining. These traditional fastening methods have many flaws; they can self-loosen, particularly under the stress of heat or vibration, resulting in downtime, quality issues, recalls, corrosion and increased maintenance. Regardless of how small the gap, side to side movement of the bolt within the nut caused by operational vibrations will eventually cause the bolt to loosen, with sometimes catastrophic results.

Anaerobic threadlockers replace mechanical threadlocking devices and offer tangible benefits in terms of productivity, efficiency and safety. These single component acrylic polymers have an anaerobic cure system that remains in a liquid form until air is absent and contact is made with metal ions. A liquid threadlocker will fill all voids between mating threads and solidifies to form a thermoset plastic that unitises the assembly.

Threadlockers also coat the entire thread and are resistant to water, solvents and oils. They serve the dual purpose as sealants and prevent corrosion from liquids, gases and air-born contaminants such as dust which would otherwise compromise bolted assemblies. Clean up is easy since any excess adhesive remains as an easily wiped away liquid.

Bondloc has an extensive portfolio of threadlocking adhesives, including COSHH free safer products. These adhesives have varying differentials in viscosity, strength, temperature resistance, cure speed and flexibility. For more specific or unique applications, formulations can be modified and then manufactured in-house. Either way, to determine the best product to use for the job, three main questions must be asked. What’s the fastener size? Which strength is needed? How frequently will the assembly need to be serviced?

But should we also challenge the efficacy of the products we purchase by asking our suppliers if their published data stacks up? The answer is most definitely, yes.

Every adhesive product purchased is underpinned with a technical data sheet and a material safety data sheet.

Claire Aldridge Deputy Editor t: +44 (0) 1727 743 889

Having joined the magazine in 2012, Claire developed her knowledge of the industry through the numerous company visits, exhibitions and conferences she attended both in the UK and abroad.

Claire prides herself on keeping readers well informed and up to date with the latest industry news.