Thermal inkjet print head with solvent resistance

A method of preparing an inkjet printing system comprising a print head in fluid communication with an ink reservoir and having a plurality of orifices and a corresponding plurality of associated ejection chambers, comprising:

• providing a substrate;
• disposing a photoresist material on the substrate, wherein the photoresist material is selected from epoxy-based photo resist materials and methyl methacrylate-based photo resist materials;
• providing a UV light source;
• providing a mask between the UV light source and the photoresist material;
• exposing the photoresist material to the UV light source to polymerize the photoresist material to form a barrier layer on the substrate, the barrier layer defining in part a plurality of fluid channels and the plurality of ejection chambers;
• and
• attaching an orifice plate over the substrate, the orifice plate including the plurality of orifices in fluid communication with the ejection chambers, wherein the orifice plate comprises a material selected from polyimides and nickel.