Technical Data
September 2014
3M™ Thermally Conductive Silicone Interface Pads
5591 and 5591S
Product Description
3M™ Thermally Conductive Silicone Interface Pad 5591 and 5591S are highly conformable, slightly tacky silicone
elastomer pads. These interface pads are designed to provide heat transfer path between heat generating components
and heat sinks, heat spreaders or other cooling devices.
Features and Benefits
• Good thermal stability of the base polymer with excellent softness of the thermal pad.
• Good thermal conductivity in an ultra soft silicone polymer base.
• The product tack is such that a mechanical means to support the pad in a final assembly is required.
Product Construction
Color
Pad Type
Pad Thickness*
Primary Filler Type
Top Liner / 5591S Film Type
(film stays with pad)
Release Liner Thickness / Type
3M™ Thermally Conductive Silicone Interface Pad 5591 and 5591S
White
Filled Silicone Polymer
0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm
Ceramic
3M pad 5591S – 12 µm PET Film
Base Liner 4 mils (100 µm) Transparent PET / Optionally, 60 µm
Embossed PE film with transparent blue color is available.
*Note: 3 M pad 5591 not available in 0.5 mm thickness.
Optional thickness > 2.0 mm are available. Contact your 3M representative for more information.
Polyester Film (12 µm) = 3M pad 5591S
(No film carrier on 3M pad 5591)
Filled Silicone Elastomer
Release Liner
3M™ Thermally Conductive Silicone Interface Pads 5591 and 5591S
Typical Physical Properties and Performance Characteristics
Note: T he following technical information and data should be considered representative or typical only and should not
be used for specification purposes.
Property
Product Number1
Value
Method
3M™ Thermally Conductive Silicone Interface Pads 5591 and 5591S
Thermal Conductivity (W/m-K)
1.0 W/m-K
Operating Temperature Range2
Hardness Shore 003
3M Test Method
with low pressure
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