Thermal Interface Products

.hide-partial { max-height: none; } .show-more { display: none; }

Tflex SF4 Thermal Gap Fillers

Laird Tflex SF4 Thermal Gap Fillers are silicon-free and offer a 0.5mm to 4mm thickness range with 4.0W/mK thermal conductivity. These gap fillers offer excellent deflection properties, minimizing pressure on components during deflection. A minimal amount of pressure is required to reach the lowest possible thermal resistance. Laird Tflex SF4 Thermal Gap Fillers are designed for datacom systems, automotive electronics, optical modules, and cameras.

.catnav-wrapper { height: auto; overflow: visible; } .catalog-nav-tabs ul { white-space: normal; }

Results: 30

Applied Filters:

Length

Width

Thickness

Reset All

Search within results

In Stock

Normally Stocked

Active

New Products

RoHS Compliant

.search-refine-wrapper { display: inline-block; min-width: 100%; } .scroll-body { overflow-x: visible; } .search-table-wrapper { overflow: visible; } .hide-partial { max-height: none; } .show-more { display: none; }

Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (PEN) Filter the results in the table by unit price based on your quantity.	Qty.	Product	Type	Package / Case	Material	Thermal Conductivity	Color	Minimum Operating Temperature	Maximum Operating Temperature	Length	Width	Thickness	Tensile Strength	Flammability Rating	Series	Packaging
Thermal Interface Products Tflex SF4 1.00 457x457mm A18840-04 Laird 1: S/987.29 8In Stock	Mfr. Part # A18840-04 Mouser Part # 739-A18840-04	Laird	Thermal Interface Products Tflex SF4 1.00 457x457mm Learn More about Laird tflex sf4 thermal gap fillers	Datasheet	8In Stock	S/987.29 S/935.10 S/905.71 S/898.58 View Quote	Min.: 1 Mult.: 1	Gap Fillers / Gap Pads / Sheets	Silicone-Free Gap Filler	Non-standard	Silicone	4 W/m-K	Gray (Light Gray)	- 65 C	+ 150 C	457 mm	457 mm	1 mm	30 psi	UL 94 V-0	SF4	Bulk
Thermal Interface Products Tflex SF4 1.50 229x229mm A18841-06 Laird 1: S/298.09 27In Stock	Mfr. Part # A18841-06 Mouser Part # 739-A18841-06	Laird	Thermal Interface Products Tflex SF4 1.50 229x229mm Learn More about Laird tflex sf4 thermal gap fillers	Datasheet	27In Stock	S/298.09 S/275.86 S/262.28 S/259.05	Min.: 1 Mult.: 1	Gap Fillers / Gap Pads / Sheets	Silicone-Free Gap Filler	Non-standard	Silicone	4 W/m-K	Gray (Light Gray)	- 65 C	+ 150 C	229 mm	229 mm	1.5 mm	30 psi	UL 94 V-0	SF4	Bulk
Thermal Interface Products Tflex SF4 2.00 229x229mm A18841-08 Laird 1: S/372.12 35In Stock	Mfr. Part # A18841-08 Mouser Part # 739-A18841-08	Laird	Thermal Interface Products Tflex SF4 2.00 229x229mm Learn More about Laird tflex sf4 thermal gap fillers	Datasheet	35In Stock	S/372.12 S/340.55 S/305.68	Min.: 1 Mult.: 1	Gap Fillers / Gap Pads / Sheets	Silicone-Free Gap Filler	Non-standard	Silicone	4 W/m-K	Gray (Light Gray)	- 65 C	+ 150 C	229 mm	229 mm	2 mm	30 psi	UL 94 V-0	SF4	Bulk
Thermal Interface Products Tflex SF4 2.50 229x229mm A18841-10 Laird 1: S/447.72 14In Stock 20Expected 10/12/2026	Mfr. Part # A18841-10 Mouser Part # 739-A18841-10	Laird	Thermal Interface Products Tflex SF4 2.50 229x229mm Learn More about Laird tflex sf4 thermal gap fillers	Datasheet	14In Stock 20Expected 10/12/2026	S/447.72 S/422.69 S/401.82 S/387.50	Min.: 1 Mult.: 1	Gap Fillers / Gap Pads / Sheets	Silicone-Free Gap Filler	Non-standard	Silicone	4 W/m-K	Gray (Light Gray)	- 65 C	+ 150 C	229 mm	229 mm	2.5 mm	30 psi	UL 94 V-0	SF4	Bulk
Thermal Interface Products Tflex SF4 3.00 229x229mm A18841-12 Laird 1: S/523.00 13In Stock	Mfr. Part # A18841-12 Mouser Part # 739-A18841-12	Laird	Thermal Interface Products Tflex SF4 3.00 229x229mm Learn More about Laird tflex sf4 thermal gap fillers	Datasheet	13In Stock	S/523.00 S/481.19 S/471.62 S/450.67	Min.: 1 Mult.: 1	Gap Fillers / Gap Pads / Sheets	Silicone-Free Gap Filler	Non-standard	Silicone	4 W/m-K	Gray (Light Gray)	- 65 C	+ 150 C	229 mm	229 mm	3 mm	30 psi	UL 94 V-0	SF4	Bulk
Thermal Interface Products Tflex SF4 3.50 229x229mm A18841-14 Laird 1: S/601.24 15In Stock	Mfr. Part # A18841-14 Mouser Part # 739-A18841-14	Laird	Thermal Interface Products Tflex SF4 3.50 229x229mm Learn More about Laird tflex sf4 thermal gap fillers	Datasheet	15In Stock	S/601.24 S/559.35 S/541.45 Quote Quote	Min.: 1 Mult.: 1	Gap Fillers / Gap Pads / Sheets	Silicone-Free Gap Filler	Non-standard	Silicone	4 W/m-K	Gray (Light Gray)	- 65 C	+ 150 C	229 mm	229 mm	3.5 mm	30 psi	UL 94 V-0	SF4	Bulk
Thermal Interface Products Tflex SF4 4.00 229x229mm A18841-16 Laird 1: S/674.96 23In Stock	Mfr. Part # A18841-16 Mouser Part # 739-A18841-16	Laird	Thermal Interface Products Tflex SF4 4.00 229x229mm Learn More about Laird tflex sf4 thermal gap fillers	Datasheet	23In Stock	S/674.96 S/627.32 S/611.47 Quote Quote	Min.: 1 Mult.: 1	Gap Fillers / Gap Pads / Sheets	Silicone-Free Gap Filler	Non-standard	Silicone	4 W/m-K	Gray (Light Gray)	- 65 C	+ 150 C	229 mm	229 mm	4 mm	30 psi	UL 94 V-0	SF4	Bulk
Thermal Interface Products Tflex SF4 0.50 229x229mm A18841-02 Laird 1: S/163.49 27In Stock	Mfr. Part # A18841-02 Mouser Part # 739-A18841-02	Laird	Thermal Interface Products Tflex SF4 0.50 229x229mm Learn More about Laird tflex sf4 thermal gap fillers	Datasheet	27In Stock	S/163.49 S/153.48 S/144.65 S/139.78	Min.: 1 Mult.: 1	Gap Fillers / Gap Pads / Sheets	Silicone-Free Gap Filler	Non-standard	Silicone	4 W/m-K	Gray (Light Gray)	- 65 C	+ 150 C	229 mm	229 mm	0.5 mm	30 psi	UL 94 V-0	SF4	Bulk
Thermal Interface Products Tflex SF4 1.00 229x229mm A18841-04 Laird 1: S/223.35 3In Stock 20Expected 11/10/2026	Mfr. Part # A18841-04 Mouser Part # 739-A18841-04	Laird	Thermal Interface Products Tflex SF4 1.00 229x229mm Learn More about Laird tflex sf4 thermal gap fillers	Datasheet	3In Stock 20Expected 11/10/2026	S/223.35 S/212.88 S/198.52 S/193.46	Min.: 1 Mult.: 1	Gap Fillers / Gap Pads / Sheets	Silicone-Free Gap Filler	Non-standard	Silicone	4 W/m-K	Gray (Light Gray)	- 65 C	+ 150 C	229 mm	229 mm	1 mm	30 psi	UL 94 V-0	SF4	Bulk
Thermal Interface Products Tflex SF4 0.50 457x457mm A18840-02 Laird 10: S/641.80 Non-Stocked Lead-Time 9 Weeks	Mfr. Part # A18840-02 Mouser Part # 739-A18840-02	Laird	Thermal Interface Products Tflex SF4 0.50 457x457mm Learn More about Laird tflex sf4 thermal gap fillers	Datasheet	Non-Stocked Lead-Time 9 Weeks	S/641.80 S/624.28 View Quote	Min.: 10 Mult.: 1	Gap Fillers / Gap Pads / Sheets	Silicone-Free Gap Filler	Non-standard	Silicone	4 W/m-K	Gray (Light Gray)	- 65 C	+ 150 C	457 mm	457 mm	0.5 mm	30 psi	UL 94 V-0	SF4	Bulk
Thermal Interface Products Tflex SF4 0.75 457x457mm A18840-03 Laird 10: S/772.00 Non-Stocked Lead-Time 7 Weeks	Mfr. Part # A18840-03 Mouser Part # 739-A18840-03	Laird	Thermal Interface Products Tflex SF4 0.75 457x457mm Learn More about Laird tflex sf4 thermal gap fillers	Datasheet	Non-Stocked Lead-Time 7 Weeks	S/772.00 S/744.83 View Quote	Min.: 10 Mult.: 1	Gap Fillers / Gap Pads / Sheets	Silicone-Free Gap Filler	Non-standard	Silicone	4 W/m-K	Gray (Light Gray)	- 65 C	+ 150 C	457 mm	457 mm	0.75 mm	30 psi	UL 94 V-0	SF4	Bulk
Thermal Interface Products Tflex SF4 1.25 457x457mm A18840-05 Laird 10: S/1,069.74 Non-Stocked Lead-Time 7 Weeks	Mfr. Part # A18840-05 Mouser Part # 739-A18840-05	Laird	Thermal Interface Products Tflex SF4 1.25 457x457mm Learn More about Laird tflex sf4 thermal gap fillers	Datasheet	Non-Stocked Lead-Time 7 Weeks	S/1,069.74	Min.: 10 Mult.: 1	Gap Fillers / Gap Pads / Sheets	Silicone-Free Gap Filler	Non-standard	Silicone	4 W/m-K	Gray (Light Gray)	- 65 C	+ 150 C	457 mm	457 mm	1.25 mm	30 psi	UL 94 V-0	SF4	Bulk
Thermal Interface Products Tflex SF4 1.50 457x457mm A18840-06 Laird 10: S/1,234.04 Non-Stocked Lead-Time 7 Weeks	Mfr. Part # A18840-06 Mouser Part # 739-A18840-06	Laird	Thermal Interface Products Tflex SF4 1.50 457x457mm Learn More about Laird tflex sf4 thermal gap fillers	Datasheet	Non-Stocked Lead-Time 7 Weeks	S/1,234.04	Min.: 10 Mult.: 1	Gap Fillers / Gap Pads / Sheets	Silicone-Free Gap Filler	Non-standard	Silicone	4 W/m-K	Gray (Light Gray)	- 65 C	+ 150 C	457 mm	457 mm	1.5 mm	30 psi	UL 94 V-0	SF4	Bulk
Thermal Interface Products Tflex SF4 1.75 457x457mm A18840-07 Laird 10: S/1,398.19 Non-Stocked Lead-Time 7 Weeks	Mfr. Part # A18840-07 Mouser Part # 739-A18840-07	Laird	Thermal Interface Products Tflex SF4 1.75 457x457mm Learn More about Laird tflex sf4 thermal gap fillers	Datasheet	Non-Stocked Lead-Time 7 Weeks	S/1,398.19	Min.: 10 Mult.: 1	Gap Fillers / Gap Pads / Sheets	Silicone-Free Gap Filler	Non-standard	Silicone	4 W/m-K	Gray (Light Gray)	- 65 C	+ 150 C	457 mm	457 mm	1.75 mm	30 psi	UL 94 V-0	SF4	Bulk
Thermal Interface Products Tflex SF4 2.00 457x457mm A18840-08 Laird 10: S/1,562.41 Non-Stocked Lead-Time 7 Weeks	Mfr. Part # A18840-08 Mouser Part # 739-A18840-08	Laird	Thermal Interface Products Tflex SF4 2.00 457x457mm Learn More about Laird tflex sf4 thermal gap fillers	Datasheet	Non-Stocked Lead-Time 7 Weeks	S/1,562.41	Min.: 10 Mult.: 1	Gap Fillers / Gap Pads / Sheets	Silicone-Free Gap Filler	Non-standard	Silicone	4 W/m-K	Gray (Light Gray)	- 65 C	+ 150 C	457 mm	457 mm	2 mm	30 psi	UL 94 V-0	SF4	Bulk
Thermal Interface Products Tflex SF4 2.25 457x457mm A18840-09 Laird 10: S/1,726.67 Non-Stocked Lead-Time 7 Weeks	Mfr. Part # A18840-09 Mouser Part # 739-A18840-09	Laird	Thermal Interface Products Tflex SF4 2.25 457x457mm Learn More about Laird tflex sf4 thermal gap fillers	Datasheet	Non-Stocked Lead-Time 7 Weeks	S/1,726.67	Min.: 10 Mult.: 1	Gap Fillers / Gap Pads / Sheets	Silicone-Free Gap Filler	Non-standard	Silicone	4 W/m-K	Gray (Light Gray)	- 65 C	+ 150 C	457 mm	457 mm	2.25 mm	30 psi	UL 94 V-0	SF4	Bulk
Thermal Interface Products Tflex SF4 2.50 457x457mm A18840-10 Laird 10: S/1,890.67 Non-Stocked Lead-Time 7 Weeks	Mfr. Part # A18840-10 Mouser Part # 739-A18840-10	Laird	Thermal Interface Products Tflex SF4 2.50 457x457mm Learn More about Laird tflex sf4 thermal gap fillers	Datasheet	Non-Stocked Lead-Time 7 Weeks	S/1,890.67	Min.: 10 Mult.: 1	Gap Fillers / Gap Pads / Sheets	Silicone-Free Gap Filler	Non-standard	Silicone	4 W/m-K	Gray (Light Gray)	- 65 C	+ 150 C	457 mm	457 mm	2.5 mm	30 psi	UL 94 V-0	SF4	Bulk
Thermal Interface Products Tflex SF4 2.75 457x457mm A18840-11 Laird 10: S/2,055.08 Non-Stocked Lead-Time 7 Weeks	Mfr. Part # A18840-11 Mouser Part # 739-A18840-11	Laird	Thermal Interface Products Tflex SF4 2.75 457x457mm Learn More about Laird tflex sf4 thermal gap fillers	Datasheet	Non-Stocked Lead-Time 7 Weeks	S/2,055.08	Min.: 10 Mult.: 1	Gap Fillers / Gap Pads / Sheets	Silicone-Free Gap Filler	Non-standard	Silicone	4 W/m-K	Gray (Light Gray)	- 65 C	+ 150 C	457 mm	457 mm	2.75 mm	30 psi	UL 94 V-0	SF4	Bulk
Thermal Interface Products Tflex SF4 3.00 457x457mm A18840-12 Laird 10: S/2,219.11 Non-Stocked Lead-Time 7 Weeks	Mfr. Part # A18840-12 Mouser Part # 739-A18840-12	Laird	Thermal Interface Products Tflex SF4 3.00 457x457mm Learn More about Laird tflex sf4 thermal gap fillers	Datasheet	Non-Stocked Lead-Time 7 Weeks	S/2,219.11	Min.: 10 Mult.: 1	Gap Fillers / Gap Pads / Sheets	Silicone-Free Gap Filler	Non-standard	Silicone	4 W/m-K	Gray (Light Gray)	- 65 C	+ 150 C	457 mm	457 mm	3 mm	30 psi	UL 94 V-0	SF4	Bulk
Thermal Interface Products Tflex SF4 3.25 457x457mm A18840-13 Laird 10: S/2,383.38 Non-Stocked Lead-Time 7 Weeks	Mfr. Part # A18840-13 Mouser Part # 739-A18840-13	Laird	Thermal Interface Products Tflex SF4 3.25 457x457mm Learn More about Laird tflex sf4 thermal gap fillers	Datasheet	Non-Stocked Lead-Time 7 Weeks	S/2,383.38	Min.: 10 Mult.: 1	Gap Fillers / Gap Pads / Sheets	Silicone-Free Gap Filler	Non-standard	Silicone	4 W/m-K	Gray (Light Gray)	- 65 C	+ 150 C	457 mm	457 mm	3.25 mm	30 psi	UL 94 V-0	SF4	Bulk
Thermal Interface Products Tflex SF4 3.50 457x457mm A18840-14 Laird 10: S/2,547.72 Non-Stocked Lead-Time 7 Weeks	Mfr. Part # A18840-14 Mouser Part # 739-A18840-14	Laird	Thermal Interface Products Tflex SF4 3.50 457x457mm Learn More about Laird tflex sf4 thermal gap fillers	Datasheet	Non-Stocked Lead-Time 7 Weeks	S/2,547.72	Min.: 10 Mult.: 1	Gap Fillers / Gap Pads / Sheets	Silicone-Free Gap Filler	Non-standard	Silicone	4 W/m-K	Gray (Light Gray)	- 65 C	+ 150 C	457 mm	457 mm	3.5 mm	30 psi	UL 94 V-0	SF4	Bulk
Thermal Interface Products Tflex SF4 3.75 457x457mm A18840-15 Laird 10: S/2,711.83 Non-Stocked Lead-Time 7 Weeks	Mfr. Part # A18840-15 Mouser Part # 739-A18840-15	Laird	Thermal Interface Products Tflex SF4 3.75 457x457mm Learn More about Laird tflex sf4 thermal gap fillers	Datasheet	Non-Stocked Lead-Time 7 Weeks	S/2,711.83	Min.: 10 Mult.: 1	Gap Fillers / Gap Pads / Sheets	Silicone-Free Gap Filler	Non-standard	Silicone	4 W/m-K	Gray (Light Gray)	- 65 C	+ 150 C	457 mm	457 mm	3.75 mm	30 psi	UL 94 V-0	SF4	Bulk
Thermal Interface Products Tflex SF4 4.00 457x457mm A18840-16 Laird 10: S/2,877.26 Non-Stocked Lead-Time 7 Weeks	Mfr. Part # A18840-16 Mouser Part # 739-A18840-16	Laird	Thermal Interface Products Tflex SF4 4.00 457x457mm Learn More about Laird tflex sf4 thermal gap fillers	Datasheet	Non-Stocked Lead-Time 7 Weeks	S/2,877.26	Min.: 10 Mult.: 1	Gap Fillers / Gap Pads / Sheets	Silicone-Free Gap Filler	Non-standard	Silicone	4 W/m-K	Gray (Light Gray)	- 65 C	+ 150 C	457 mm	457 mm	4 mm	30 psi	UL 94 V-0	SF4	Bulk
Thermal Interface Products Tflex SF4 0.75 229x229mm A18841-03 Laird 1: S/208.64 Non-Stocked Lead-Time 7 Weeks	Mfr. Part # A18841-03 Mouser Part # 739-A18841-03	Laird	Thermal Interface Products Tflex SF4 0.75 229x229mm Learn More about Laird tflex sf4 thermal gap fillers	Datasheet	Non-Stocked Lead-Time 7 Weeks	S/208.64 S/176.88 S/175.98 S/174.27 View S/172.13 Quote	Min.: 1 Mult.: 1	Gap Fillers / Gap Pads / Sheets	Silicone-Free Gap Filler	Non-standard	Silicone	4 W/m-K	Gray (Light Gray)	- 65 C	+ 150 C	229 mm	229 mm	0.75 mm	30 psi	UL 94 V-0	SF4	Bulk
Thermal Interface Products Tflex SF4 1.25 229x229mm A18841-05 Laird 20: S/245.03 Non-Stocked Lead-Time 7 Weeks	Mfr. Part # A18841-05 Mouser Part # 739-A18841-05	Laird	Thermal Interface Products Tflex SF4 1.25 229x229mm Learn More about Laird tflex sf4 thermal gap fillers	Datasheet	Non-Stocked Lead-Time 7 Weeks	S/245.03 S/242.78 S/240.36 S/238.10 View Quote	Min.: 20 Mult.: 1	Gap Fillers / Gap Pads / Sheets	Silicone-Free Gap Filler	Non-standard	Silicone	4 W/m-K	Gray (Light Gray)	- 65 C	+ 150 C	229 mm	229 mm	1.25 mm	30 psi	UL 94 V-0	SF4	Bulk

Tflex SF4 Thermal Gap Fillers

Applied Filters:

Customer Service Office

Company

Resources

Support