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| M2T has largely been replaced with MXT. The pro series hose line (CR1, CR2, IA3K) have really inexpensive rubber on the inner liner and on the cover, it's designed to just meet the industry specs for impulse, UV, min bend radius, etc. It's probably not terrible stuff but for not much more you can get something with a premium cover.
The "standard" cover on the Megasys line of hose is pretty good, it has good abrasion resistance and better than average ozone resistance. There isn't an ASTM standard test for UV resistance on polymers so you can't really do an industry standard test for UV to compare to. UV and ozone are very closely inter-related and ultimately it is UV creating high surface temperatures that result in a very thin layer with high ozone which results in tires, hoses, and other rubber parts degrading and breaking down. If you want to get a better hose cover use the XTF or XTP covers which have some changes in rubber compound to get better abrasion resistance and along with that much improved ozone resistance. The MTF cover is a thin layer of UHWMPE (ultra high molecular weight polyethylene) plastic wrapped on the hose before vulcanizing that makes it very slick and very abrasion resistant, but the downside is that a MTF cover hose vibrating or rubbing against a standard or XTF cover will chew right through it. I've even seen where MTF cover will wear away steel before wearing through the hose cover. This is the ultimate hose cover to use between tractor remotes and an implement where it could drag on the ground or on a power shaft or something.
I use M3K-XTF for everything I own but if I had a skid steer or backhoe with 4000 psi implement pumps I would keep M4K-XTF around.
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Gates hydraulic hose difference
