United States Gypsum Company

Therese A Fults

Richard B Stevens

Mark H Englert

Steven W Sucech

Michael J Porter

Bruce Lynn Petersen

Russell A Dombeck

Charles J Miller

Michael R Lynn

Timothy G Kenny

Peter M Attard

Thomas G Houman

John D Halm

Aida L Carbo

An acoustical panel comprising a continuous phase of an interlocking set gypsum matrix and a method of preparing an acoustical panel are disclosed.

Acoustical panel comprising interlocking matrix of set gypsum and method for making same

A rough-surfaced substrate, such as a fiberboard, is provided with a smoother surface by applying a coating comprising calcium sulfate hemihydrate which has been prevented from hydrating to gypsum by set preventer, and which sets when brought into contact with a set initiator, e.g. aluminum sulfate, preferably present on the surface of the substrate.

Substrate smoothed by coating with gypsum-containing composition and method of making

Disclosed is a ready-to-use self-gauging coating compound containing about 65%-75% solids that provides a flat finely textured finish with improved abuse (abrasion) resistance properties. The coating composition comprises a resin binder in which there is dispersed an aggregate consisting of particles in a selected size range in a quantity sufficient to form a layer of particles one particle deep on the substrate when the coating is applied to the substrate.

Abuse resistant skim coating composition

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Woodale, IL, United States of America

Therese A Fults