Sterling's website (http://www.sterlingrope.com/product/299074/A060Power/_/6mm_PowerCORD) lists the following for 6mm powercord strength: MBS lbs (kN) 4,789 (21.3) There is no mention of "7.2 kN" anywhere on the product page; so, it seems reasonable to assume the "7.2 kN" listed here at backcountry is a typo. I would go with the manufacturer's stated minimum breaking strength (MBS) of 21.3 kN. Also, in Sterling's technical manual (available at the link listed above) they refer to the Technora® core fibers as "High Tenacity Aramid Fibers" akin to Twaron® and Kevlar®. I don't no if they're still technically "nylon" or its chemical equivalent, but it's clear they're not simply 'standard' nylon. I hope that helps.

I use this as my cordelette for canyoneering and trad climbs...EXCELLENT durability and strength...the only 2 things you give up with it is a little weight (it's lighter than a 6 or 7 mm of the same length of regular cord) and it's very low stretch (not dynamic) so don't expect it to absorb force if shock loaded. Once you figure that into your set up, then your ready. I have sat on mine dragging it across many sandstone canyons in Zion as i have squeezed through tight slot canyons and it BARELY retains a blemish. This is hardcore cord...no pun intended... PS: Despite what Mr. Bohanon says below, it is not just a standard nylon cord, just read that product description above closely..."The 6mm PowerCord is stronger than standard nylon, breaking at a astronomical 4800lb." So it's as strong as a solid carabiner or any other part of the system (rope, harness, etc.) so unless your planning to hang your Mini Cooper from it, you have no worries. (but it still most likely would hold it)

it's made from the hair of club gear managers that didn't go on the spring break trip...