Better bonding in two-shot or insert over-moulding
A
RTP Company product story
Edited by the Engineeringtalk editorial team
Mar 9, 2004
First in a series of functional thermoplastic elastomer compounds are formulated for specific properties and optimised performance.
RTP Company has introduced the first in a series of functional thermoplastic elastomer compounds that are formulated for specific properties and optimised performance.
The first commercial grades to be released, which have been designated RTP 6002 and RTP 6003, have been developed for improved bonding in two-shot or insert over-moulded applications.
Each product is available in hardnesses of 45, 55 and 75 shore A.
"Over-moulding with elastomers is a way to add value and functionality to an application", said Paul Killian, Product Manager for Elastomers at RTP Company.
"The addition of an elastomer can provide better grip performance, improve aesthetics or provide sound and vibration dampening, as well as offer protection from impact and drop forces to an application".
"In any over-moulding process, however, the critical element is the bond between the soft elastomeric material and the rigid substrate".
"This property is essential for part success and a long life cycle for the application in the field".
The company has used its portfolio of elastomer resin systems to develop these products that are optimised for bonding to different substrates.
RTP 6002 is formulated for improved bonding to PC, ABS and PC/ABS, while RTP 6003 offers better bonding to PC/PBT and PC/PMMA.
"These two products have been developed to bond to standard off-the-shelf substrates as well as with RTP Company's custom compounds and pre-coloured materials", said Killian.
A major benefit of these products is that they provide moulders with a comfortable processing window.
Killian said: "For a successful bond to occur during over-moulding, it's critical to have the proper processing and design conditions".
"Many injection moulders are very aware of this".
"However, some are not".
"One of our goals during development was to be able to offer products that have the widest possible processing window for the injection moulder".
In addition to its elastomer technologies, the firm has experience developing rigid substrate materials.
"This is a real competitive advantage for us", said Killian, "Bringing this combination of know-how to the table enables RTP Company to work with customers on both the rigid substrate and the overmould material to optimise the combination for overall performance and bondability".
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