Sorry for joining the thread so late on. Our S2 adhesive will fix tiles onto chip-board and we can say this with confidence, what we can’t say is that your chip-board is of a suitable type to be tiled on to. It has been well documented that tiling to chip-board can cause problems such as tiles de-bonding or the chip-board expanding and contracting due to the addition of moisture from the adhesives. Most chip-boards are not good for tiling because they are very unstable and not treated against the ingress of moisture and those that are rarely have the tongue and groove treated which is a passage for moisture ingress. If moisture gets in on these edges it can cause a problem called “grinning”, which causes the boards to curl up at the edges and could potentially cause tiles to de-bond. That said there are some better quality chip-boards around that can be tiled directly too. These types of chip-boards may have a vinyl/Formica type covering which will help in keeping the moisture out. There are some manufacturers that will say their chip-boards cannot be tiled onto directly because they are unstable, and with that information it would be hard to guarantee any product onto an unstable substrate. British Standards 5385 state that all substrates for tiling onto must be dry, strong, stable and clean. If the chip-board you would like to tile is not the correct type then I would recommend over laying it with a 6mm tile backer board. These boards will create a sound and stable substrate to tile onto. Also the Anti-fracture Matting is designed to absorb lateral movement in heated floors not to absorb deflection, it may add something to the make up of the floor but if there is deflection something more substantial will be needed, and do not forget no matter how flexible your adhesive is your tiles are not.
