EnduraMag is our branded magnesium alloy, like all magnesium alloys this blend of metals is about 30% lower density than aluminum. Unlike other magnesium alloys on the market, we have developed our own alloy and process technology to improve key deficiencies often found in older magnesium alloy systems. Corrosion is one of the first things engineers ask us about magnesium alloys, and its an important question. But often it is lack of hands on experience with magnesium that has maintained a shroud over magnesium alloy development over the last 20 years. Our current alloy EnduraMag 260 is as corrosion resistant as some aluminum casting alloys and even many 7000 series aluminum alloys. But this is never enough, on top of this weather resistant alloy we apply a MAO /PEO coating. This is a highly ordered adherent layer of spinel consisting of MgAl2O4 this offers greatly improved corrosion resistance abrasion resistance and base coat for a wide range of decorative coatings. Below you can see an amazing video of the process, it’s quite spectacular.
Moving on its important to note we prefer materials with high endurance. In light alloys, high endurance is different than in the world or steel. Steel can often exhibit what is effectively endless endurance. Light alloys such as Aluminum or Magnesium have limited use life. With the exception of 6069, few alloys of aluminum offer meaningful endurance, so designers must design products with greater strength, which means heavier. This is not the case with Magnesium alloys, with many magnesium alloys they offer endurance similar to 6069 or 5xxx aluminum alloys. While common alloys (such as AZ alloys) offer mediocre endurance. In most cases, this is related to stress in corrosive environments, where the aluminum and zinc conspire to lower stress strain corrosion resistance. EnduraMag has endurance measured in 10’s of millions of cycles.
Lastly the question of strength, EnduraMag offers strength to weight ratio 12% higher than 6069-T9. This allows about 10% reduction in rim weight when compared to 6069 in a similar profile. Our EnduraMag 2628 versus our 6069-T9 2628 are good examples of this benefit. A really important hidden benefit of this is impact strength which might be one of the most important features of a modern rim. Impact strength is a function of material thickness and proof stress ( commonly referred to as yield strength). Given magnesium’s lower density we can offer 15-25% greater wall thickness, this offers a disproportionate increase in dent resistance. Magnesium has long been used in critical applications where resistance to denting is key. We see in impact tests our rims can withstand hits that dent aluminum rims and do so 8-10 times without seeing a dent as seen in 6069-T9 rims of the same design.
EnduraMag rims at Carbon fiber weight, that bend rather than break, are higher dent resistance than any aluminum rim, this is the EnduraMag advantage.