The 7.5 W/m·K grade publishes 0.154–0.539 °C·in²/W at 10 psi, 0.074–0.203 at 30 psi and
0.061–0.129 at 50 psi: the band moves by more than a factor of 2.
Supplied thickness 500–5 000 µm.
76 part numbers in one published family differ only in thickness, carrier and sheet size.
Thickness tolerance comes from the first-article drawing.
Hardness
Hardness is the assembly-stress number
Stocked hardness spans 10 to 65 Shore 00 by ASTM D2240: 1.2 W/m·K at 10 Shore 00 for warped lids and
thin boards, 7.0 W/m·K at 65 Shore 00 for flat interfaces under firm clamping.
Dry contact touches under 3 % of the apparent area.
Contamination
What reaches the coolant
Oil bleed
≤ 1 % on Φ30 mm filter paper at 25 % compression, 125 °C.
Siloxane
D3–D20 below 20 ppm; outgassing TML 0.170 % and CVCM 0.010 % by ASTM E595.
Silicone-free grade
2.0 W/m·K, 45–55 Shore 00, 2.5 g/cc.
The 2025 REACH SVHC candidate list runs to 240+ substances and includes D4, D5 and D6, so a
silicone-free pad answers a compliance question.
Electrical
The electrical rows are per grade
Breakdown voltage
≥ 5.0 kV/mm by ASTM D149 on the 5.0 W/m·K grade.
Dielectric constant
7.1 at 1 MHz on the 5.0 grade, 8.10 on the 7.5 grade.
Volume resistivity
8.7 × 10¹³ Ω·cm on the 7.5 W/m·K grade.
Flame rating
UL 94 V-0, the rating these grades are built to.
The document
What the pad datasheet carries
Three impedance pressures, three rows.
Row
Unit
Method or basis
Model code
—
EMS-TM-P12-10 … P75-20
Thermal conductivity
W/m·K
ASTM D5470
Thermal impedance at 10 psi
°C·in²/W
ASTM D5470
Thermal impedance at 30 psi
°C·in²/W
ASTM D5470
Thermal impedance at 50 psi
°C·in²/W
ASTM D5470
Thickness range
mm
ASTM D374
Thickness tolerance
mm
from the drawing
Hardness
Shore 00
ASTM D2240
Density
g/cm³
ASTM D792
Breakdown voltage
kV/mm
ASTM D149
Dielectric constant
at 1 MHz
ASTM D150
Volume resistivity
Ω·cm
per grade
Oil bleed
%
Φ30 mm paper, 25 % compression, 125 °C
Outgassing TML
%
ASTM E595
Outgassing CVCM
%
ASTM E595
Low siloxane
ppm
D3–D20
Operating temperature
°C
IEC 60068-2-14
Flame rating
—
UL 94 V-0
Adhesive face
—
per drawing
Shelf life and storage
months
1 year
A W/m·K figure without its test pressure and its thickness is not a specification.
Send the drawing, the gap and the pressure
Drawing or gap size in mm · target W/m·K · assembly pressure in psi. You get the datasheet with
impedance at 10, 30 and 50 psi, the drawing and the lead time.
