●Make sure that the drilling depth is 20mm according to the regulation.
●If it is drilled deeper than 20 mm, it may damage the PC steel wire or penetrate the skeleton and may not show sufficient strength. (See the figure below)
●In the case of a semi-precast concrete slab, it cannot be applied to the thin-walled part (shell part) before concrete is placed and hardened.
※The strength data of the base material can be downloaded from our website.