FireDefender® Mineral Core

FireDefender® Mineral Core material fills most of the space in the interior of a door. It is relatively light in density at approximately 32 pounds per cubic foot. It has excellent thermal properties and through-bolting is allowed, but it is not intended to provide screw-holding capabilities.

High-performance Fire Door Components

FireDefender® mineral cores are made of a proprietary mix of various minerals, fiberglass, and inert binders. They are available in a variety of thicknesses ranging from 1.500″ – 2.000″ (38mm – 51mm) and in various sizes up to a maximum of 34-1/2″ x 82″ (876mm x 2083mm). The mineral core is easily sawn with ordinary woodworking equipment and can be pieced together to make doors as large as four feet wide and ten feet tall. Georgia-Pacific mineral core is also approved for use in temperature rise applications in wood fire doors.

Fire Resistant


Physical Properties

Light gray


1.485-1.6875 in  –  3.8-4.3 cm

Weight (12"x12"x1.5")

3.5-4.5 lbs./ft2 –  17.0-22.0 kg/m2


28-35 lbs/ft3  –  454-567 kg/m3

Compressive Strength

250-400 lbs/in2  –  1724-2758 kPa

Flexural Strength

85-125 lbs  –  39-57 kg

Flexural Strength Sample Size


Tensile Strength

20-40 lbs/in –  138-276 kPa

Test Standards

Doors built with FireDefender® components have been successfully tested to meet all the following standards:

UBC 7-2 (1997)

ISO 3008

NFPA 252 (1999)

BS 476 PART 22

UL 10-C (1998)

Japanese Industrial Standard


ASTM E-2074

CSFM 12-43-4
Safety Data Sheets

For a full list of FireDefender® Safety Data Sheets

click here

Sales Support

Luke Fitzwater

Account Services

Corinne Chambers

Related Products