M-BLOC® Abuse Resistant Type X Gypsum Board End Tape

M-BLOC® Abuse Resistant Type X Gypsum Board


M-BLOC® Abuse Resistant Type X Gypsum Board

M-Bloc® AR Type X interior gypsum panels treated with AzoTech™ fungicide were designed and tested to not only provide exceptional resistance to moisture and mold, but superior resistance to abrasion, abuse and indention when compared to traditional wallboard. These panels consist of an abuse, fire, mold and moisture defiant core encased in heavy abrasion, mold and moisture resistant 100% recycled paper.

M-Bloc AR Type X interior gypsum panels are recommended for commercial and institutional construction where greater resistance to abrasion, abuse and indentation are required. These UL classified panels are allowed for use in any fire rated design where American Gypsum’s 5/8” Type X wallboard is approved.

Products manufactured by American Gypsum contain no asbestos. AzoTech™ is a trademark of a Syngenta Group Company.

Basic Uses

Along with being the ideal gypsum wallboard for projects requiring superior resistance to abrasion, abuse and indentation, M-Bloc AR Type X panels have been tested for mold resistance to the industry’s most rigorous standards achieving the best possible results. At an independent laboratory, certified in accordance with ISO 17025-2005, M-Bloc AR Type X interior gypsum wallboard attained a score of 0 per ASTM G 21 and a 10 when tested to ASTM D 3273, thus minimizing the risk of mold and mildew growth.

M-Bloc AR Type X panels can be used throughout a project, being finished the same as regular gypsum wallboard while accepting a wide variety of attractive finishes. Additionally M-Bloc AR Type X panels can be used as a base for the adhesive application of ceramic or plastic tile in limited wet areas, e.g., bathrooms, kitchens, laundry, and utility rooms.

With joints covered, M-Bloc AR Type X gypsum wallboard will resist the passage of smoke. For additional information on smoke barriers, refer to Gypsum Association publication, “Building and Inspecting Smoke Barriers” (GA-618).


With up to 90% of our time spent indoors - in an office building, shopping center, or school - indoor air quality becomes a crucial factor when selecting the proper building materials.

The M-Bloc® family of gypsum wallboard products has attained the GREENGUARD Indoor Air Quality Certified® status and GREENGUARD Children & SchoolsSM status. To obtain the M-Bloc product certificates please select the GREENGUARD link at right.

Product Data


Thickness Widths Lengths Edge Type
5/8" (15.9mm) 4' (1219mm) 8' (2438mm) Tapered
5/8" (15.9mm) 4' (1219mm) 10' (3048mm) Tapered
5/8" (15.9mm) 4' (1219mm) 12' (3658mm) Tapered

Special lengths or edges may be available on special order. Consult your American Gypsum sales representative for details.

Thermal Resistance “R” Value 5/8” = 0.61

Technical Data

Storage & Handling

M-Bloc AR Type X interior gypsum panels do not generate or support the growth of mold when they are properly transported, stored, handled, installed, and maintained. However, mold spores are present everywhere and when conditions are favorable; mold can grow on practically any surface. GYPSUM BOARD MUST BE KEPT DRY to prevent the growth of mold.

Gypsum board that has visible mold growth must not be used. For additional information refer to Gypsum Association publication, “Guidelines for the Prevention of Mold Growth on Gypsum Wallboard” (GA-238).

Gypsum board must be stored in an area that protects it from adverse weather conditions, condensation, and other forms of moisture. Job site conditions that can expose gypsum board to water or moisture must be avoided.

Gypsum board must be protected during transit with a weather-tight cover in good condition. Plastic shipping bags are intended to provide protection during transit only and must be promptly removed upon arrival of the load. Failure to remove the shipping bag can increase the likelihood of developing conditions favorable to the growth of mold.

Gypsum board must be stored off the ground and under protective cover. Sufficient risers must be used to assure support for the entire length of the wallboard to prevent sagging.

Gypsum board must be delivered to the job site as near to the time it will be used as possible. Individuals delivering gypsum board to jobsites should ensure that it is carried, not dragged, to place of storage/installation to prevent damage to finished edges.

Gypsum board shall always be stacked flat -NEVER on edge or end. Gypsum board stacked on edge or end is unstable and presents a serious hazard should it accidentally topple. Gypsum board should be placed so weight is evenly distributed and the floor is not overloaded.

Applicable Standards

Mold Resistance Score of 0 (ASTM G 21)
Score of 10 (ASTM D 3273)
Water Absorption <5% (ASTM 1396)
Manufacturing ASTM C 1396
Federal Specification - SS-L-30D Type III Grade X
Abrasion Resistance Level 2 (ASTM C 1629)
Indentation Resistance Level 2 (ASTM C 1629)
Soft Body Impact Resistance Level 1 (ASTM C 1629)
Surface Burning Characteristics ASTM E 84
Flame Spread - 15
Smoke Developed - 0

Fire Resistance Ratings

LEED / Green

LEED Contributions

Our products can contribute to the following credits within the Materials and Resources (MR) category.

  • LEED MR Credit 2: Construction Waste Management
  • LEED MR Credit 4: Recycled Content
  • LEED MR Credit 5: Regional Materials

Our products can contribute to the following credit within the Indoor Environmental Quality (IEQ) category.

  • LEED IEQ Credit 4.6: Low-Emitting Materials - Ceiling and Wall Systems (SCHOOLS ONLY)

To learn more please click the LEED link at right.