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Magnum educates gasket installers about compression set

Tuesday, April 24, 2012 - 10:59
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Magnum Gaskets is cautioning technicians and DIYers to be especially mindful of the gaskets they choose due to a recent influx of imported molded gaskets with inferior rubber compounds, which will not provide the long-term service life they expect.

Of particular concern is that the appearance of good quality and poor quality molded gaskets can be nearly identical, yet they will have vastly different levels of sealing ability.

The invisible difference between premium quality gaskets and those of lesser quality is the compression set of the synthetic rubber. Compression set is the measure of how much a rubber seal loses the ability to “push back” against the sealing surfaces over a period of time, so a smaller number is better.

“Carefully selected and processed rubber compounds almost never exhibit more than 20 percent compression set in our tests, which are conducted according to ASTM standards," Matt Algate, manager of Magnum’s Florida gasket molding facility explains. “When we evaluate competitors’ gaskets that were recently sourced in the Far East, test results showing 40 to 60 percent compression set are common with some results spiking much higher. There is no way that those gaskets can maintain a tight seal for the same number of miles as premium quality gaskets.”

More than 90 percent of Magnum products are designed, manufactured and packaged in the U.S.A. The complete Magnum Gasket line covers more than 80 percent of sales in manifold, valve cover and oil pan gasket categories for domestic and import cars and light trucks, at very competitive prices.

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