Manufacturer page.

3/8 in. (9.5 mm) Sheetrock ® Brand Gypsum Panels. Recommended in single- or double-layer wood- or steel-framed wall and ceilings, as an additional layer for improving sound control, and as a face layer for use over old wall and ceiling surfaces. Comply with ASTM C1396, Standard Specification for Gypsum Board, for 3/8 in. (9.5 mm) gypsum wallboard. Underwriters Laboratories Inc. (UL) Classification as to surface-burning characteristics and noncombustibility. Achieved GREENGUARD Gold Certification and qualifies as a low VOC emitting material (meets CA 01350). 3/8 in. (9.5 mm) Sheetrock ® Brand Gypsum Base Imperial ®. 3/8 in. (9.5 mm) rigid gypsum base for veneer plaster systems. Feature a noncombustible gypsum core encased in a distinctive, 100% recycled blue face paper that controls water absorption, provides a strong plaster bond and resists plaster slide or slip under the trowel. Comply with ASTM C1396, Standard Specification for Gypsum Board, for 3/8 in. (9.5 mm) and gypsum base for veneer plaster. Underwriters Laboratories Inc. (UL) Classification as to surface-burning characteristics and noncombustibility. Achieved GREENGUARD Gold Certification and qualifies as a low VOC emitting material (meets CA 01350)