21.9–25.8GPasourcethe bare laminate's (fr4-370hr), in-plane: cross direction .. length direction (ASTM D790-15e2); the copper planes are left out
Density
2,082kg/m³sourceface brick density row used for k (BIA notes most fired clay brick 120-130 lb/ft3)
not sourced
Strength to weight
2.45kN·m/kg
not sourced
Stiffness to weight
not sourced
not sourced
Poisson's ratio
not sourced
0.171–0.177sourcethe bare laminate's (fr4-370hr), in-plane: cross direction .. length direction
Shear modulus
not sourced
10.2GPa
Bulk modulus
not sourced
12.2GPa
Speed of sound
not sourced
not sourced
Thermal
Thermal conductivity
0.92–1.12W/m·Ksourcerange for 130 lb/ft3 face brick (ASHRAE 2013 via BIA)
not sourced
Thermal expansion
7.2µm/m·KsourceTMS Code average coefficient, clay/shale unit masonry
13–14µm/m·Ksourcethe bare laminate's (fr4-370hr), in-plane X/Y-axis, below Tg (IPC-TM-650 2.4.24C)
100 mm part over a 50 °C swing
36µm growth1.87x less
67.5µm growth
Specific heat
837J/kg·Ksourcevalue used in BIA heat-capacity sample calculation
not sourced
Heats up and cools (diffusivity)
0.585mm²/s
not sourced
Thermal shock resistance
not sourced
not sourced
Values for
Solid extruded clay/shale brick units (BIA 1993 manufacturer survey, TN 3A 2024); face brick of 130 lb/ft3 for thermal properties (BIA TN 4, from ASHRAE 2013); CTE is the TMS Code value for clay/shale masonry
A whole circuit board read as one orthotropic plate: the JEDEC high-K thermal test board (JESD51-7, "2s2p"), 0.062 in (1.575 mm) thick with two internal solid copper planes 0.0014 in (1 oz) thick, as Texas Instruments SZZA017A Table 1 gives it. Copper C110 and the Isola 370HR laminate from this library; the layers conduct in parallel along the board and in series through it (boardStackup.ts). Its two 0.0028 in trace layers cover little of the board and are left out; vias are ignored. Mechanical values are the bare laminate's.
Every value links to the document that states it. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.
Questions
Is Brick stronger than PCB Board FR-4, 2 copper planes?
PCB Board FR-4, 2 copper planes is stronger: its tensile strength is 315 MPa against 5.1 MPa for Brick (61.8x).
Which expands less with temperature?
Brick expands less: 7.2 µm/m·K against 13.5 µm/m·K for PCB Board FR-4, 2 copper planes.