The Ulano Corporation gained worldwide recognition within the graphic arts industry with the invention and promotion of the first masking film: Rubylith™. Rubylith™ is used in every segment of the graphic arts and has gained such prominence that the Rubylith™ brand has become synonymous with masking film. Ulano continues to produce and distribute Rubylith™ products to a broad graphic arts customer base, which includes the screen printing industry.

Rubylith™ RU3 is a high tack ruby film coated onto 300-gauge polyester. Can be cut manually or on a plotter to produce masks for film contacting and plate making and film positives for photographic stencil production. Rubylith has an emulsion thickness range of 1.1 - 1.2 mils.