Product category:
Moulding materials
News Release from: Victrex | Subject: Victrex Peek polymer
Edited by the Manufacturingtalk Editorial
Team on 13 December 2001
Polymer combined with PTFE in cylinder
head gasket
German manufacturer STE has developed a new cylinder head gasket using a powder coating process that combines Victrex Peek polymer and PTFE.
German manufacturer STE has developed a new cylinder head gasket using a powder coating process that combines Victrex Peek polymer and PTFE The development of this highly durable plastic coating also opens up important opportunities for other applications in which low friction and low wear must be ensured at high temperatures and under load
This article was originally published on Manufacturingtalk on 26 Nov 2001 at 8.00am (UK)
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The gasket, sold under the trade name of Monomet, is a solid steel stamping with a predefined thickness distribution.
The coating, which is applied in a secondary step, has to meet a range of demanding requirements and is of key importance to the overall function of the product.
An engine's cylinder head places extreme demands on all surrounding components, in particular on the cylinder head gasket.
Further reading
Composite flow moulding strengthens polymers
Composite Flow Moulding, CFM, is an innovative process for manufacturing endless fibre reinforced components with superior strength.
CFM plus polymer produces high strength fasteners
Composite flow moulding for manufacturing endless fibre reinforced components with superior strength uses a thermoplastic matrix of polymer to give ultra-high specific strength for fasteners.
The temperatures in this environment vary between 30degC and 250degC, (85degF and 480degF), and can be even higher in the short-term.
The aggressive mix of hot water and steam from the cooling circuit with glycol, and hot engine oil and gasses from the combustion compartment represents an extreme challenge to the sealing materials.
Furthermore, due to the distortion of the cylinder head, the gasket is subjected to compression forces of up to 200N/mm2, which demands high strength over a wide temperature range.
In addition, the micro-movement of the aluminium cylinder block resulting from temperature variations and engine vibration must be absorbed by the gasket at the lowest possible coefficient of friction.
Applied using the multislide coating process, STE's tailor-made compound based on Peek polymer and PFTE meets these critical requirements for temperature, wear and chemical resistance.
The innovative coating prevents the risk of contact corrosion and "welding" of the cylinder head on the cylinder block.
This means that the parts can be easily disassembled and replaced, if necessary, during servicing.
In fact, the gasket can be repeatedly reinstalled without any significant effect on cylinder head performance.
One of STE's most difficult tasks was to ensure a good permanent adhesion of the coating to the metal gasket.
By using a special bonding agent, STE perfected the coating technology so that an overall coat of only 20 microns, (less than 0.8mil), passed 2,000 hours of hot water testing at 120degC (248degF).
In the meantime, the coated head gasket has been proven in both OEM tests, (including 900hrs of thermal shock), and in 30 months of operation in vehicles on the road.
Victrex, which has its sales, technical and production headquarters at Thornton Cleveleys in Lancashire, UK, had a turnover of more than GBP 58m in the last financial year.
The company exports 98 percent of its Victrex Peek polymer output to OEMs in the automotive, industrial, medical, food and electronics market sectors in Europe, North America and Asia Pacific.
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