fumi Acoustic Plaster® E1 is a fine, ready-mixed mortar made of dispersions and silicates with lightweight mineral aggregates. With a grain size of approximately 0.3–0.5 mm and a thermal conductivity of 0.12 W/(mK), it achieves a sound absorption coefficient of up to alpha w 0.80, depending on the system configuration. The white plaster is applied in layer thicknesses of 2–3 mm to acoustically effective substrate systems such as perforated gypsum plasterboard or mineral fiberboard. fumi Acoustic Plaster® E1 is available in white and comes in 27-liter buckets. It is classified as fire-retardant (B1) and has the customs tariff number 32149000.