Frosted Glass Interior Door A Frosted Glass Interior Door is a stylish and functional design element used to enhance privacy while allowing light to pass through. These doors feature glass panels treated with an acid-etching or sandblasting process that gives the glass a smooth, opaque finish. Commonly used in modern homes and offices, frosted glass interior doors are ideal for bathrooms, bedrooms, home offices, and other spaces where both discretion and a sense of openness are desired.