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Food Processing News
News Release from: E-Components and Chains | Subject: Detectamet/Detectathane
Edited by the Processingtalk Editorial
Team on 11 April 2006
Metal detectable general purpose
compound
Metal detectable Detectamet/Detectathane is a metal detectable general purpose compound having good mechanical properties
Metal detectable Detectamet/Detectathane is a metal detectable general purpose compound having good mechanical properties Features include good heat stability inside the temperature range, high impact resistance, excellent abrasion resistance, tough and durable, supplied in a specific colour - blue
This article was originally published on Processingtalk on 29 Jul 2004 at 8.00am (UK)
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Hardness.
Detectamet/Detectathane is supplied in a range of hardnesses from 25 Shore A which is softer than a pencil rubber or an elastic band to 84 Shore D which is harder than a golf ball.
The table below gives some guidance as to these hardness ranges.
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Compression.
When load is applied to Detectamet/Detectathane it deflects but unrestrained surfaces bulge in sympathy.
This is because Detectamet/Detectathane is incompressible and acts like a fluid capable of changing its shape to the limit of its strength under load.
Strictly speaking this is not compression but nevertheless it is the term used in elastomer technology.
Detectamet/Detectathane has a higher load bearing capacity than that of more conventional elastomers for the same hardness.
This characteristic permits greater design choices and usually allows the use of smaller components.
ECC/Detectamet can offer guidance on polymer selection and provide indicative load and deflection figures for most compression applications.
Tension.
Tensile strength and associated elongation are usually measured as part of material and process control regimes.
It is rare that elastomers are used in tension and then only at a small fractlon of thelr ultimate strength.
Even so Detectamet/Detectathane has much higher tensile strengths than conventional elastomers.
Resilience.
While resilience is generally a function of hardness in conventional elastomers, this is not true of Detectamet/Detectathane.
Detectamet/Detectathane can be formulated to give a wide range of resilience values.
An added benefit is that the resilience changes very little between 10C and 100C giving more consistent performance in a variable environment.
Abrasion.
When compared to rubber, plastics and metals Detectamet/Detectathane offers outstanding resistance to wear giving many times the life span of these conventional materials.
Detectamet/Detectathane can be tailored to suit sliding and impingement abrasion and has a well deserved reputation for its durability.
Temperature.
Detectamet/Detectathane will provide excellent service in cold stores and Arctic conditions.
Physical properties change little down to -15C, and while further reductions in temperature result in a gradual stiffening, Detectamet/Detectathane is still quite serviceable at -70C.
At higher temperatures Detectamet/Detectathane will provide good service up to 90C and is suitable for intermittent use at 120C.
Beyond these temperatures, specially formulated materials are needed.
Water Resistance.
Selected grades of Detectamet/Detecta-thanes are suitable for use in water at up to 50C.
Water absorption is very low and volume swell is negligible.
This means that precise components can be used safely in water without fear of size changes affecting performance.
High humidity has little effect on Detectamet/Detectathanes and a secondary benefit is that these elastomers do not support fungus growth and are generally resistant to such attack.
This makes Detectamet/Detectathanes mouldings particularly suitable for tropical environments.
Mechanical Properties.
At low hardnesses all elastomers, Detectamet/Detectathane included, merely bend under impact.
As hardness rises elastomers and plastics demonstrate a tendency to brittleness and crack under impact.
Detectamet/Detectathane has significantly better impact resistance than any material of comparable hardness.
Detectamet/Detectathane will resist cracking under repeated flexing.
Selection of the appropriate grade will allow extremely high life spans, with tests proving that in excess of 1,000,000 cycles is common place.
Detectamet/Detectathane will also show excellent resistance to cut propagation and can be used in very thin sections because of its exceptional strength and toughness.
Friction.
Detectamet/Detectathane resembles most other elastomers in that friction decreases as hardness rises.
The coefficient of friction against non-Iubricated surfaces ranges from 0.2 (hard polymers) to 0.6 (soft polymers).
Machineability.
It is possible to machine most grades of Detctamet/Detectathane.
The harder grades can be processed on most conventional machine tools, while softer compounds need to be ground or cut with very sharp tools.
Electrical Properties.
Detectamet/Detectathane generally has very good insulating properties and can be used for potting and encapsulation.
It is also an excellent material for mounting conductive rails, particularly outside, where it not only provides good insulation but also does not deteriorate.
Noise.
The combination of compressive and flex characteristics make Detectamet/Detectathane ideal for breaking noise transmission paths.
It makes superb heavy duty machine mounts.
Applications: Wearstrips, Guide Blocks, Impact Bars, Gaskets, Conveyor Skirting, Roller Coverings, Scrapers, General Engineering Applications, Liners.
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