Micore 300 (Flame Resistant Mineral Fiber Core & Backer Board)

Versatile, high performance core or substrate

  • Handles morcell nameasily than gypsum panels and particle board
  • Outstanding versatility adapts to a variety of applications
  • Simplified component assembly saves time and money
  • Smooth, coated finish maintains tighter tolerance
  • Exceptional tackability
  • Good sound control

    Micore® Brand 300 Board from USG is a superior substrate for fabric and vinyl-covered wall panels, office dividers and tackboards. An excellent core for chalkboards. stove boards, and similar applications. MICORE Brand 300 Board offers outstanding residence. superior machinability. high “k” factor, heavy density and highest surface hardness of any MICORE board


Density ( lb/ft³ )24 ±2
Modulus of Rupture ( lb/in² )350 to 450
Thickness ( in )3/8
Thickness ( mm )375
Modulus of Elasticity ( lb/in² )30000 to 35000
Tensile Strength (Parallel to Surface) ( lb/in² )225 to 275
Thermal Conductivityk Factor - 0.458
R Value (1/2" board) - 1.09
Tolerance of Thickness± 0.015" sanded and coated
Tolerance of Width and Length (per 4ft)± 1/16" (0.0625")
Surface Burning Characteristics - Flame Spread25
Surface Burning Characteristics - Smoke Delivered10
Weight ( lb/MSF )500 to 2000
Tensile Strength (Perpendicular to Surface) ( lb/in² )20 to 30
Hardness (Janka Ball) ( lb )50 to 70
Hygrometric Expansion From 50% to 90% R.H. ( % )0.1
STC Rating24
0.25 to 0.30
0.30 to 0.35


MICORE Brand 300 board is nearly 50% lighter than particle board, which allows for easier handling and lower freight rates, it also outperforms gypsum panels in workability-the inorganic mineral fibers resist moisture, minimizing expansion and warpage. And the board cuts quickly to size and shape specifications using standard equipment while adapting readily to last-minute design changes. What’s more. MICORE Brand 300 Board outperforms particle board and other wood-fiber boards for flame spread and sound absorption

Storage and Handling

All materials shall be delivered in their original unopened packages and stored in an enclosed shelter providing protection from damage and exposure to thcell namelements. Damaged or deteriorated materials shall be removed from the premises.


Exposure to excessive or continuous moisture should be avoided.

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