COFLEX CAJ - The "invisible" expansion joint. It is considered as such due to its 5 mm top width which makes it look as if were part of the grouting joint. The harder plastic flange guarantees an excellent hold under the tile and will follow its movements in compression and expansion. Suitable for internal and external use and virtually maintenance free. The soft plastic is resistant to most relevant chemicals encountered in tile applications, to weathering, ageing and UV rays. Designed to divide big tiled areas in smaller bays. It will remain flexible and resistant to attacks of fungus and bacteria. The CAJ model offers a rather limited tile edge protection.