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Is it safe to use G90 connectors with Micronized Copper Quatenary (MCQ™ or Smart Sense-MicroPro™) pressure-treated wood?

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Is it safe to use G90 connectors with Micronized Copper Quatenary (MCQ™ or Smart Sense-MicroPro™) pressure-treated wood?

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MCQ is one of the newer pressure-treated wood formulations on the market, which claims to be less corrosive to metal connectors and fasteners. Simpson Strong-Tie tested Smart Sense-MicroPro (MCQ) and ACQ CarboQuat pressure-treated woods (0.25 pcf and 0.40 pcf retention levels were used for both treated woods) to measure corrosion rates. Simpson Strong-Tie followed the general requirements of the AWPA E12 test criteria with minor exceptions. Simpson went beyond the minimum 10-day requirement established by AWPA E12 and took measurements of G90 and G185 coupons at 30, 60, 90 and 120 days. (Note: This is our standard protocol for corrosion testing and provides additional data points to better establish the trend in corrosion rates.) Our test results indicated that the potential corrosion rate of Smart Sense-MicroPro (MCQ) treated wood is somewhat less than the ACQ wood that was tested. However, the MCQ corrosion level was not reduced enough to warrant recommending the use of G90 in all ap

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