in Aerospace

Kummer launches UV-curable epoxies for aerospace

Posted 1 May 2019 · Add Comment

Supplier of high-performance speciality adhesives, John P Kummer, is today launching new UV-curable epoxies for dam and fill processes within the UK aerospace sector.

 

The 'dam & fill' process with two materials is mainly used in cases where a component needs to be protected with either an optically-transparent or opaque encapsulant or if a conventional glob-top material is too viscous to flow around and underneath fine wires. Optically transparent encapsulants usually have a low viscosity. A dam is therefore applied around the component first to prevent the potting material from flowing over the substrate.

Epo-Tek OG116-31 is a UV-curable epoxy. Due to its thixotropic1 nature it is often used as a dam. It can be cured with UV-light in a very short time. Afterwards the encapsulant – either also a UV-cure or a thermoset material - can be applied. Whilst OG142-87 is typically use for a UV fill, both products have a high glass transition temperature (Tg >100°C).

As most UV-cure epoxies, both OG116-31 and OG142-87 are cationic products. Ionic polymerisation is initiated by photo-generated ions. The cure process continues until all polymers are consumed. Generally, cationic products have the benefits of less shrinkage and higher adhesion over free radical cured systems and are not adversely impacted by an oxygen rich curing environment.

Rob Church of JP Kummer said: “The dam and fill process is often a tricky operation. However, these two new UV-curable epoxies make it more straight-forward, with more consistent applications. We are really pleased to make these available.”

Thixotropy is a time-dependent shear thinning property. Certain gels or fluids that are thick, or viscous, under static conditions will flow (become thin, less viscous) over time when shaken, agitated, sheared or otherwise stressed (time dependent viscosity). They then take a fixed time to return to a more viscous state.

 

* required field

Post a comment

Other Stories
Advertisement
Latest News

NCA launches its National Strategic Assessment

There are at least 181,000 offenders linked to serious and organised crime (SOC) in the UK, the National Crime Agency (NCA) revealed today, as it launched its National Strategic Assessment (NSA) 2019 the most comprehensive study yet of

Air BP and Neste offer sustainable aviation fuel

Air BP returns to EBACE 2019 (21st-23rd May), with the news that it has offered sustainable aviation fuel to general and business aviation customers and aircraft manufacturers at Stockholm Arlanda airport in Sweden and Caen Carpiquet

OCR International expands in UK and Europe

As demand for Global Trade Management Solutions (GTM) increases, OCR Services Inc. has expanded its international footprint, product and service portfolio into the UK and European market.

German government orders three ACJ350s

The German government has placed a firm order for three ACJ350-900 XWBs, becoming the first government customer for the type, which has already been ordered by private customers.

UK and US pilots to undertake simultaneous simulator training

Speaking on a visit to RAF Waddington last week, Defence Minister Stuart Andrew revealed that British pilots will be able to undertake simultaneous, virtual exercises with US counterparts based across the Atlantic, by using new

Government expands ePassport gate use to seven more countries

From today, visitors from Australia, Canada, Japan, New Zealand, Singapore, South Korea and the US, will be able to use ePassport gates at ports across the UK and juxtaposed controls in a move designed to speed up border controls for

See us at
DSEI JP BT1605201119VIDSE BT1605060320SMIFAVWS BT1302060619