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

M-BLOC® Impact Resistant Type X Gypsum Board


M-BLOC® Impact Resistant Type X Gypsum Board

M-Bloc® IR 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 impact penetration, abrasion, abuse and indention when compared to traditional wallboard. These panels consist of an impact, abuse, fire, mold and moisture defiant core encased in heavy abrasion, mold and moisture resistant 100% recycled paper.

M-Bloc IR Type X interior gypsum panels are recommended for commercial and institutional construction where greater resistance to penetration, 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 impact penetration, abrasion, abuse and indentation, M-Bloc IR 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 IR 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 IR 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® IR 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 IR 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

Installation - M-Bloc IR Type X shall be installed in accordance with the recent editions of “Application and Finishing of Gypsum Panel Products” (GA-216) and or “Standard Specification for Application and Finishing of Gypsum Board” (ASTM C 840).
The building temperature shall be maintained at not less than 50ºF (10ºC) for adhesive application of gypsum board, during joint treatment, texturing, and decoration. When a temporary heat source is used the temperature shall not be more than 95°F (35°) in any given room or area. Adequate and continuous ventilation shall be provided in the working area during the installation and the drying or curing period.

The listed impact penetration/abrasion/abuse/indention ratings apply to walls constructed with M-Bloc IR Type X gypsum wallboard installed vertically to minimum 20 gauge framing members spaced a maximum of 16" o/c.

The design professional has the ultimate responsibility for location of control joints.

Decoration - The design professional, contractor and or owner shall review “Recommended Levels of Gypsum Board Finish” (GA-214), in order to specify the proper level of drywall finishing needed to assure the desired results. For best painting results, all surfaces, including joint compound, should be clean, dust-free and not glossy. To equalize the porosities between the face paper and joint compound and improve fastener and joint concealment, the surface shall be primed and sealed with a full-bodied high solids drywall primer before texturing or final decoration. The selection of the proper paint to give the specified or desired finished characteristics is the responsibility of the design professional, contractor and or owner.

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 3 (ASTM C 1629)
Indentation Resistance Level 2 (ASTM C 1629)
Soft Body Impact Resistance Level 3 (ASTM C 1629)
Hard Body Impact Resistance Level 3 (ASTM C 1629)
Surface Burning Characteristics ASTM E 84
Flame Spread - 0
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.