Hard UV Ink
A rigid UV-curable ink formulated with shorter, more reactive monomers that crosslink into a hard, glass-like polymer film. Hard UV ink delivers excellent scratch resistance, chemical resistance, and outdoor durability but cracks if the substrate flexes. Hard ink is used on rigid substrates — glass, metal, ceramic, acrylic, hard plastic, rigid signage, awards. Common in flatbed UV printing for promotional goods and industrial decoration. Applying hard ink to a flexible substrate is the most common reason UV prints crack in the field.
Related Terms
A flexible UV-curable ink formulated with urethane acrylate oligomers that crosslink into a rubbery, bendable polymer film. Soft UV ink is used on substrates that flex, stretch, or curve in normal use — leather goods, silicone phone cases, vinyl banners, soft drinkware sleeves, and curved tumblers. Soft ink trades some scratch resistance for the ability to bend without cracking. Most consumer UV DTF transfers ship with soft ink because the broadest market is curved drinkware and flexible cases.
A variant of DTF printing that uses ultraviolet-curable inks printed onto a special A/B film set. UV DTF creates peel-and-stick transfers that adhere to hard surfaces like tumblers, phone cases, glass, wood, and metal without a heat press.