Aug 10, 2012
Solid adhesives benefit industryBack
© Reuse this
He states that the biggest advantage of using preformed adhesives is that solid preforms remain so until they are heated, enabling epoxy to flow consistently onto the desired component, whereas liquid adhesives typically drip and dispense inconsistently onto unwanted areas of a component.
Multi-Seals’ US-manufactured Uni-form and Poly-form adhesive seals were both developed as alternatives to liquid adhesives.
The Uni-form is a one-part epoxy resin that is solid at room temperature. When heated, it melts and cures, forming a consistent seal to protect components from dust, moisture, oil, flux, industrial cleaning solvents, conformal coatings and other contaminants.
Meanwhile, the Poly-form is flexible before curing, which allows the manufacturer to produce larger and thinner adhesive configurations, says Harvill.
“This is because of a predetermined catalyst-to-resin ratio that produces a complete one-component system, resulting in predictable and consistent results, compared with variable mixed and metered liquid epoxy performance,” he explains.
Further, the viscosity of preforms remains consistent from seal to seal and batch to batch, whereas liquid epoxy continues to polymerise as it is dispensed, causing equipment clogs and variations in viscosity and seal quality.
The rapid manual and automated dispensing abilities of solid adhesives far exceed those of manually dispensed liquids, states Harvill.
Multi-Seals’ Uni-form adhesive, in particular, is well suited to a variety of automatic or semiautomatic sealing equipment dispensers such as templates, pick-and-place and bowl-fed gravity track methods.
Further, the solid adhesive enables simple cleanup.
Preform residue is easily swept up, while handling equipment needs to be wiped down only once or twice a week, says Harvill.
In comparison, liquid epoxy usually requires extensive cleanup procedures.
Edited by: Chanel de Bruyn© Reuse this Comment Guidelines (150 word limit)
Other Seals, Gaskets and Sealing Mechanisms News
Recent Research Reports
Road and Rail 2014: A review of South Africa's road and rail infrastructure (PDF report)
Creamer Media’s Road and Rail 2014 report examines South Africa’s road and rail transport system, with particular focus on the size and state of the country’s road and rail network, the funding and maintenance of these respective networks, and the push to move road...
Real Economy Year Book 2014 (PDF Report)
This edition drills down into the performance and outlook for a variety of sectors, including automotive, construction, electricity, transport, steel, water, coal, gold, iron-ore and platinum.
Real Economy Insight: Automotive 2014 (PDF Report)
This four-page brief covers key developments in the automotive industry over the past 12 months, including an overview of South Africa’s automotive market, trade figures, production and the policies influencing the sector.
Real Economy Insight: Construction 2014 (PDF Report)
This five-page brief covers key developments in the construction industry over the past 12 months. It provides an overview of the sector and includes details of employment in the sector, infrastructure and municipal spending, as well as insight into companies’...
Real Economy Insight: Electricity 2014 (PDF Report)
This five-page brief covers key developments in the electricity industry over the past 12 months, including details of State-owned power utility Eskom’s generation activities, funding and tariffs, independent power producers and prospects for the sector.
Real Economy Insight: Road and Rail 2014 (PDF Report)
This six-page brief covers key developments in the road and rail industries over the past 12 months, including details of South Africa’s road and rail network and prospects for both sectors.
This Week's Magazine
The board of UD Trucks Southern Africa (UDTSA) has announced the resignation of MD Jacques Carelse. Long-time UD employee, corporate planning and marketing GM, Rory Schulz, has been appointed as acting MD while the process started to appoint a new MD. The Japanese...
There is a need to start planning another pumped storage scheme in South Africa. Much work has already been done at a site in the Limpopo province and the project was very close to being put out to tender at one stage. In 2008/9 the National Energy Regulator of South...
The Coega Development Corporation (CDC) is preparing to leverage its strategic coastal position to develop the Eastern Cape economy through proposed aquaculture development zones (ADZs), with a proposed R2-billion project aiming to contribute $278-million to the...
Completion of the ongoing construction of the 102 km Zomba–Jali–Phalombe–Chitakale road, in southern Malawi, has been extended from June to December 15 because of persistent rains and difficulties in paying the contractor. The project is being undertaken by Kuwait's...
The Malawi government has awarded South African firm Fischer Consortium the contract to upgrade the Malawi Road Traffic Information System. The Directorate of Road Traffic and Safety Services at Malawi's Ministry of Transport and Public Works says Fischer...