Kryton Buildmat Co. Pvt. Ltd. Offers Non-Toxic Stiff-Dough Consistency Powder. Kryton Buildmat Co. Pvt. Ltd. Is an ISO 9000 certified company that manufactures Crystalline Concrete Waterproofing Systems. The Non-Toxic Stiff-Dough Consistency Powder used to immediately arrest the seepage or flow of water through concrete cracks. Within two minutes it sets to a completely waterproof seal and continues to harden until its strength exceeds that of the concrete onto which it has been applied. On setting, it expands to improve sealing. It has exceptional structural strength. This powder is safe for drinking water applications. It is non-toxic, non-metallic with no calcium.