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TOsol differs from PTA. It is already crystallized and shows the photocatalytic activity when it is coated and dried. In case of flat and smooth surface the TO coated to the substrate comes off as a powder when rubbed with a finger because TOsol cannot form a hardness film. However, the hardness of the film coated with TiO2 can be improved when it is heated to a certain temperature. TO-85 and TO-240 are suitable for dip coating. Spray coating also be used. TO is already crystallized to anatase so that it shows the photocatalytic function when it is coated and dried at room temperature. However, it is more efficient to conduct high temperature heat treatment that corresponds to the substrate in order to improve its various activities and adhesion.
TPX is a mixed solution of PTA and TO. A film coated TPX achieves photocatalytic effect and hardness strength of the film can be made after drying at room temperature. TPX is a neutral solution that can be applied to various materials including metal and resin. A coated film with TPX never dissolves in water. Photocatalytic effect and hardness of the film can be increased when it is heated. Spraying coating is the most suitable way for TPX. But substrates can be dipped into the TPX liquid or applied by brush. The film's hardness decreases when it is not sufficiently dried. Photocatalytic activity and the hardness of the coated film can be increased when it is heated within the permissible high temperature of the substrate. A coated film does not decrease the hardness due to the time change.
PTA is an amorphous condition aqueous solution. PTA does not have any photocatalytic function under room temperature unless it is heated to more than 250C A very fine titanium dioxide film can be made on a surface at room temperature. It can be used as a protection layer for an organic substrate. PTA-85 is suitable for spray coating and PTA-170 is used for dip coating. When it is heated to more than 250C the amorphous condition becomes a structure of anatase crystal. Heat treatment of more than 800C changes the anatase crystal to rutile causing its photocatalytic effect decrease. PTA-85 is recommended to use for producing photocatalytic tile.