Highest Thermally Conductive and Non-Flammable interface materials.


SARCON® Highest Thermally Conductive Putty Type is a customer friendly material due to its easy application by printing. The material’s putty nature greatly contributes to reduction of contact resistance and consequently to its low thermal resistance. Then this material has a flame retardancy of UL 94 V-0 and a very Low Molecular Siloxane content.
Putty-AL type has one surface with aluminum film.

Series Characteristics Constructions
SARCON® XR-Um Silicone compound with double sticky surfaces and Thermal Conductivity of XR-v material is 17.0W/m-K by using GHP (11.0W/m-K by using Hot Disk)
SARCON® XR-Um-Al Silicone compound as above XR-Um plus 10μ m Aluminum Film, which enables users to remove the carrier film after installation (before operation) with no-pull-out effect
XR-Um / XR-Um-Al
Item Size (mm) Tolerance (mm)
Width 10.0 to 50.0 ±1.5
Length 10.0 to 50.0 ±1.0
Thickness 20X-Um 0.22 ±0.04
30X-Um 0.30 ±0.06
40X-Um 0.40 ±0.08
50X-Um 0.50 ±0.10
20X-Um 30X-Um 50X-Um 20X-Um-Al 30X-Um-Al 50X-Um-Al
100kPa(14.5psi) 0.2 (0.02) 0.2 (0.03) 0.4 (0.06) 0.3 (0.04) 0.4 (0.05) 0.5 (0.08)
300kPa(43.5psi) 0.1 (0.02) 0.2 (0.03) 0.3 (0.05) 0.3 (0.04) 0.3 (0.04) 0.4 (0.06)
500kPa(72.5psi) 0.1 (0.02) 0.2 (0.02) 0.3 (0.04) 0.2 (0.03) 0.3 (0.04) 0.3 (0.05)

Test method: Fujipoly Test method, FTM-P3050 by TIM Tester 1300 which is ASTM D5470 equivalent
• Specimen Area; DIA.33.0mm (1.30in)

Properties unit XR-Um Test method Specimen
Color - Light Gray Visual -
Specific Gravity - 3.2 ASTM D 792 A
Dielectric Constant - 50Hz 9.49 ASTM D 150 A
1kHz 8.19
1MHz 7.71
Dissipation Factor - 50Hz 0.1800 ASTM D 150 A
1kHz 0.0516
1MHz 0.0047
Thermal Conductivity W/m-K 17.0 by GHP ASTM D 5470 -
11.0 by Hot Disk ISO/CD 22007-2
Useful Temperature ℃ (°F) -40to+150 -40to+302) - -
Low molecular
wt% D4 to D20 Total or less Gas
Flame Retardant UL94 V-0* UL 94 -

• Test methods of Thermal Conductivity are based on Fujipoly Test Method, FTM P-1612 by Hot Disk and FTM P-3030 by GHP(Guarded Hot Plate).
* XR-Um-Al : V-0 equivalent • Specimen A: 2mmT

Test Property Specimen 120 150
Initial 250hrs 500hrs 1,000hrs Initial 250hrs 500hrs 1,000hrs
Thermal Resistance 20X-Um 0.20 0.17 0.19 0.21 0.20 0.26 0.26 0.26
40X-Um 0.29 0.30 0.30 0.30 0.29 0.31 0.35 0.37
Test Property Specimen 85/85%RH -40(30min)+125(30min)
Initial 250hrs 500hrs 1,000hrs Initial 250hrs 500hrs 1,000hrs
Thermal Resistance 20X-Um 0.20 0.20 0.22 0.22 0.20 0.18 0.19 0.19
40X-Um 0.29 0.28 0.28 0.30 0.29 0.29 0.28 0.31

Test method: Measured by GHP (Guarded Hot Plate) method according to ASTM D5470 modified
・Specimen Area; 15mm square
・Specimen is sandwiched between aluminum blocks.

reduced temperature
-40℃ = -40°F
85℃ = 185°F
120℃ = 248°F
125℃ = 257°F
150℃ = 302°F



・Peel the product with
Carrier Film off from PET Film


・Apply onto Heat Sink


・Roll twice on the film to attach to heat sink


・Peel off instantly the PET
film to horizontal direction

Statement of Lieu of Warranty

• Properties of the products may be revised due to some changes for improving performance.
• Properties values in this document are not specification or guaranteed.
• This product is made of silicone, and silicone oil may exude from the product.
• This product is made of silicone, and low molecular siloxane may vaporize depending on operating conditions.
• The product is designed, developed, and manufactured for general industrial use only. Never use for medical, surgical, and/or relating purposes. Never use for the purpose of implantation and/or other purposes by which apart of or whole product remains in human body.
• Before using, a safety must be evaluated and verified by the purchaser.
• Contents described in the document do not guarantee the performances and qualities required for the purchaser’s specific purposes. The purchaser is responsible for pre-testing the product under the purchaser’s specific.
• Statements concerning possible or suggested uses made herein may not be relied upon, or be constructed, as a guaranty of no patent infringement.

Handling Notes

• It is recommended to use the material in up to 30% of compression ratio. Using the material beyond the recommended compression rate may result in excessive silicone oil exudation.
• It is recommended to compress the material with the equal ratio on the whole surface. Partial excessive stress may also result in excessive silicone oil exudation.