Not exactly. It means its stronger, but not necessarily more flexible. The way I've been told (but am open to more scientific explanations if anyone has them) is that if it takes more N per mm2 to cause it to "snap", it has a higher density and is more rigid. If the EN196 test was to be done side by side, the polymer modified cement based sample would start to flex long before the epoxy...... but the downside is it would snap sooner.
In a real world installation, if there was any movement in a floor or wall, the epoxy wouldn't "buffer" the movement because it is too rigid, it would just transfer the stress or tension to the tile.
Ok, so lets look at it this way. If we could have a sample "rod" of UCP and KP of equal length, balanced between two equally spaced supports, with an equal 8N force pulling down on it, which do you think will be bending the most? the least rigid or most rigid?
Flexural strength is all the factory can give you but its a rough guide when you know a product has a flexible polymer built in. As far as I am aware there is no test for actual flexibility as it is not a requirement.
