M-Glass Shaft Liner panels consist of a fire-resistant type X gypsum core that is encased in a moisture and mold resistant glass mat fabric. The panels feature a double beveled edge for ease of installation, with the ends being square-cut and finished smooth. M-Glass Shaft Liner panels are available: 1" thick x 2' wide, and in a variety of lengths.

American Gypsum products contain no asbestos and no detectable levels of formaldehyde.

Basic Uses

M-Glass Shaft Liner panels are UL Classified (UL Type - M-Glass) and used in conjunction with other American Gypsum products and metal framing members for Shaftwall and Area Separation Wall systems. Lightweight non-load bearing gypsum Shaftwall systems have replaced traditional masonry for interior vertical enclosures including stairwells, elevator enclosures and mechanical chases.

American Gypsum’s M-Glass Shaft Liner panels have been approved for use in the following fire rated assemblies:

• U 375 2 Hour H-Stud Area Separation Wall System
• V 455 1 & 2 Hour Shaftwall Systems using I, C-H and C-T Studs
• U 428 2 Hour Shaftwall System using C-H and C-T Studs
• U 429 2 Hour Area Separation Wall System using C-H and C-T Studs
• V 433 2 Hour Shaftwall System using I-Studs

American Gypsum’s M-Glass Shaft Liner is manufactured to meet or exceed the requirements of ASTM C1658/C1396, and was developed for and is backed by a limited warranty for exposure up to 12 months under normal weather conditions on commercial and residential projects.