Consumercarts is reader-supported. Learn more
Alphacool Apex Thermal Pad Soft 18W/mK vs Fujipoly SARCON GR-Pm Silicone Putty Sheet: Comparison
Alphacool Apex Thermal Pad Soft 18W/mK vs Fujipoly SARCON GR-Pm Silicone Putty Sheet: the thermal conductivity difference
There is no decisive spec gap here. Thermal conductivity splits them by a margin most buyers will never feel, Alphacool Apex Thermal Pad Soft 18W/mK 17.8 W/mK against Fujipoly SARCON GR-Pm Silicone Putty Sheet 4.5 W/mK. Conductivity source is not the same on both, https://shop.alphacool.com/en/shop/thermal-conductant/thermal-pads/waem-alphacool-apex-thermal-pad-soft-18w/mk-120x20x1mm on the Alphacool Apex Thermal Pad Soft 18W/mK versus https://www.fujipoly.eu/sarcon-products/sarcon-gr-pm on the Fujipoly SARCON GR-Pm Silicone Putty Sheet.
Alphacool Apex Thermal Pad Soft 18W/mK vs Fujipoly SARCON GR-Pm Silicone Putty Sheet: which one fits your build
Take the Alphacool Apex Thermal Pad Soft 18W/mK for high-end CPU/GPU, VRM/MOSFET, and memory-module cooling wanting the highest independently-measured W/mK figure among this catalog's pads. It is equally the pick for builds needing a documented electrical safety spec sheet (volume resistance, dielectric breakdown) rather than a generic non-conductive claim. It is the wrong buy for buyers who specifically want Eisschicht's softer, more paste-like conforming fit for delicate uneven surfaces. The Fujipoly SARCON GR-Pm Silicone Putty Sheet suits uneven-height component gap filling and VRM and memory cooling, though it is not the pick for precision flat CPU/GPU die contact requiring maximum W/mK. Our rating of the Alphacool Apex Thermal Pad Soft 18W/mK (6.8/10): A soft, high-conductivity pad aimed at high-end builds, though it lacks the independent review base of the paste side of Alphacool's lineup. Our rating of the Fujipoly SARCON GR-Pm Silicone Putty Sheet (6.7/10): A conformal silicone putty sheet suited to irregular gaps, from an established industrial thermal brand.
Frequently asked questions
Do the Alphacool Apex Thermal Pad Soft 18W/mK and Fujipoly SARCON GR-Pm Silicone Putty Sheet differ on viscosity?
Yes. Viscosity reads 0 Pa-s on the Alphacool Apex Thermal Pad Soft 18W/mK versus Highly conformal, non-curing silicone putty on the Fujipoly SARCON GR-Pm Silicone Putty Sheet.
Is the Compound Type the same on the Alphacool Apex Thermal Pad Soft 18W/mK and Fujipoly SARCON GR-Pm Silicone Putty Sheet?
It is. Both are listed at Silicone-Based Pad, so it is not a reason to pick one over the other.
Specs and benchmarks
Brand
- Alphacool Apex Thermal Pad Soft 18W/mK
- Alphacool
- Fujipoly SARCON GR-Pm Silicone Putty Sheet
- Fujipoly
Compound Type
- Alphacool Apex Thermal Pad Soft 18W/mK
- Silicone-Based Pad
- Fujipoly SARCON GR-Pm Silicone Putty Sheet
- Silicone-Based Pad
Model
- Alphacool Apex Thermal Pad Soft 18W/mK
- Alphacool Apex Thermal Pad Soft 18W/mK
- Fujipoly SARCON GR-Pm Silicone Putty Sheet
- SARCON GR-Pm
Thermal Conductivity
- Alphacool Apex Thermal Pad Soft 18W/mK
- 17.8 W/mK (ASTM D5470)Best
- Fujipoly SARCON GR-Pm Silicone Putty Sheet
- 4.5 W/mK (Hot Disk)
Electrical Conductivity
- Alphacool Apex Thermal Pad Soft 18W/mK
- Insulating
- Fujipoly SARCON GR-Pm Silicone Putty Sheet
- Insulating
Package Size
- Alphacool Apex Thermal Pad Soft 18W/mK
- 120 x 20 x 1.5mm sheet
- Fujipoly SARCON GR-Pm Silicone Putty Sheet
- Sheet form, cut to size, multiple thicknesses
Recommended Use
- Alphacool Apex Thermal Pad Soft 18W/mK
- High-end CPU/GPU
- Fujipoly SARCON GR-Pm Silicone Putty Sheet
- Mainstream CPU/GPU and uneven-surface gap filling
Conductivity Source
- Alphacool Apex Thermal Pad Soft 18W/mK
- https://shop.alphacool.com/en/shop/thermal-conductant/thermal-pads/waem-alphacool-apex-thermal-pad-soft-18w/mk-120x20x1mm
- Fujipoly SARCON GR-Pm Silicone Putty Sheet
- https://www.fujipoly.eu/sarcon-products/sarcon-gr-pm
Viscosity
- Alphacool Apex Thermal Pad Soft 18W/mK
- 0 Pa-s
- Fujipoly SARCON GR-Pm Silicone Putty Sheet
- Highly conformal, non-curing silicone putty
Paste Segment
- Alphacool Apex Thermal Pad Soft 18W/mK
- Pad
- Fujipoly SARCON GR-Pm Silicone Putty Sheet
- Pad
Which one should you pick?
Choose Alphacool Apex Thermal Pad Soft 18W/mK if you want the higher thermal conductivity (17.8 W/mK (ASTM D5470) vs 4.5 W/mK (Hot Disk)).
Choose Fujipoly SARCON GR-Pm Silicone Putty Sheet if you already have it on hand or find it at a lower price.
Price comparison
| Retailer | Alphacool Apex Thermal Pad Soft 18W/mK | Fujipoly SARCON GR-Pm Silicone Putty Sheet |
|---|---|---|
| Alphacool Shop (EU) | View on Alphacool Shop (EU) | |
| Fujipoly Europe | View on Fujipoly Europe |
Disclaimer: The price and specification of the given product may differ from the actual product. Please confirm on the retailer's website before buying.
Verdict
Alphacool Apex Thermal Pad Soft 18W/mK
6.8 / 10 Expert Rating
A soft, high-conductivity pad aimed at high-end builds, though it lacks the independent review base of the paste side of Alphacool's lineup.
Fujipoly SARCON GR-Pm Silicone Putty Sheet
6.7 / 10 Expert Rating
A conformal silicone putty sheet suited to irregular gaps, from an established industrial thermal brand.
More comparisons in Thermal Paste
- Alphacool Apex Thermal Pad Soft 18W/mK vs Noctua NT-H1
- Alphacool Apex Thermal Pad Soft 18W/mK vs Noctua NT-H2
- Alphacool Apex Thermal Pad Soft 18W/mK vs Honeywell PTM7950
- Alphacool Apex Thermal Pad Soft 18W/mK vs Thermal Grizzly KryoSheet
- Alphacool Apex Thermal Pad Soft 18W/mK vs Arctic TP-4
- Alphacool Apex Thermal Pad Soft 18W/mK vs PCCooler EX90