In the Nexterion® Glass B specification, a number of spot type defects are listed under “Surface specification”. What do these terms mean?
Here are the definitions of possible glass surface defects in Nexterion Glass B slides: Spot defect: A defect that commonly looks dark against the surrounding coating, when viewed in transmission. Open bubble: Large bubble located on the glass surface. Dig: An oblong or circular abrasion to the surface of the glass. The cause is similar to that of the scratches, but digs are shorter in nature. Chip: A small piece of glass broken from an edge. Dross: Dross is formed from molten tin as a result of oxidation or reaction with other contaminants. Drip: A drip is produced by the condensation of alkali-borates, released from the float bath, on the glass surface. Tos: This is an abbreviation for “top opened seed”. Seeds are tiny round or oval shaped enclosed bubbles, generally 1-2 mm wide, that may contain small particles from the powdered ingredients used in the production of the BOROFLOAT glass. There is a depression in the glass that accompanies the inclusion or seed that will be apparent w
