Coating which has thickened to a jelly like consistency, making it unusable.
transition temperature (Tg)
Temperature point where a polymer experiences a significant change in properties. The
polymer structure turns to glassy and visco-elastic states.
Below Tg even segmental movement in polymer molecules is restricted, and polymers
become rigid and sometimes even brittle bodies. Above Tg polymers are rubber-like.
Sheen or ability of a surface to reflect light. Gloss is measured at a 60°
Additive use to enhance or reduce gloss of a coating.
enhancer and Matting
Additive used in decorative and special paints to increase gloss.
Ability of a coating application to retain the original sheen during weathering.
Degree of dispersion of a pigment suspension after dispersion
process. Grind fineness can be measured using a Hegman gauge.
Dispersion process used to reduce the particle size of pigments and extenders, during which
agglomerates and aggregates are breaking.