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FABROCK™ HD is a high, mono density board ideal for fabrication because of its uniform integrity. With excellent fire, acoustic and thermal properties, FABROCK™ HD is ideal for use in Fire Doors and other OEM applications where rigid board insulation is required. As with all ROXUL products, it has excellent fire properties, is dimensionally stable, vapor permeable and will not encourage the growth of mold.


  • Non-combustible stone wool insulation with melting point of approx. 1177°C (2150°F)
  • Does not promote smoke or flame spread when exposed to flame
  • Denser composition provides excellent sound control
  • Outstanding thermal resistance
  • Dimensionally stable water and moisture resistant
  • Does not promote growth of fungi or mildew
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Technical Information

Property Test Standard Performance
Compliance ASTM C612 Mineral Fiber Block and Board Thermal Insulation, Type IVB Compliant
Reaction to Fire ASTM E84 (UL 723) Flame spread index = 0 ; Smoke development index = 0
Reaction to Fire CAN/ULC S102 Flame spread index = 0 ; Smoke development index = 0
Reaction to Fire CAN/ULC S114 Behaviour of materials at 750°C (1382°F) - Non Combustible
Density ASTM C303 Actual Density 12.5 lb/ft³ (200 kg/m³)
Dimensional Stability ASTM C356 Linear Shrinkage 1.1% @ 1200°F (650°C)
Corrosion Resistance ASTM C795 Stress Corrosion Cracking Tendency of Austenitic Stainless Steel = Passed
Corrosion Resistance ASTM C665 Corrosion of Steel = Passed
Thermal Resistance ASTM C518 (C177) R-Value / inch @ 75oF 3.8 hr.ft2.F/Btu
Thermal Resistance RSI value / 25.4mm @ 24oC 0.67 m2K/W
Reaction to Moisture ASTM C1104 Moisture Sorption by weight - <1.0%>
Reaction to Moisture ASTM C1338 Determination of Fungi Resistance - Passed
Reaction to Moisture ASTM E96 Water Vapor Transmission , Disiccant Method - 2360 ng/Pa.s.m2 (41 perm)
Compressive Strength ASTC C165 12psi (85kPa) @ 10% compression
Compressive Strength (@1" thickness) ASTC C165 28psi (190kPa) @ 25% compression
Thickness Contact ROXUL for sizing information (1-800-265-6878)
Dimensions Contact ROXUL for sizing information (1-800-265-6878)
Acoustical Performance ASTM C423 Thickness 125 Hz 250 Hz 500 Hz 1000 Hz 2000Hz 4000 Hz NRC
Acoustical Performance ASTM C423 1.0" 0.03 0.41 0.85 0.89 0.89 0.97 0.8
Acoustical Performance ASTM C423 2.0" 0.39 0.73 0.81 0.86 0.97 0.95 0.85
Acoustical Performance ASTM C423 4.0" 0.61 0.69 0.79 0.87 0.96 0.97 0.85

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