what is this product's thermal conductivity (W/mK)?

I don't know actually. it looks to be 0.5 to 0.6 W/mK !

Is this ok to use around a heat sensor in a boiler

No it’s for clickson disk thermostats the little round ones with two circuit wires or boiler copper wired phials old type which insert into heat exchangers, This compound makes the thermostat more conductive to its chassis making it temp accurate Ps...you will see if heat sink has been used on thermostats By boiler manufacturers from the factory it’s normally dried out. Hope this helps . Regards.

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Regin REG-Z20 Heat Sink Compound

Product ID: 56460851

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Details

Brand
Regin
Cooler heat sink material
Aluminium
Cooler heatsink compatibility
Universal
Item weight
25 Grams
Manufacturer
Regin

🔧Material: Aluminium

⚙️Weight: 25g

🌡️Temp Range: -50˚C to 200˚C

Description

🔥 Keep Your Cool with Regin's Heat Sink Compound!

LIGHTWEIGHT DESIGN - Weighs only 25 grams, making it easy to handle and apply.
RELIABLE PERFORMANCE - Consistent results that keep your systems running smoothly.
VERSATILE APPLICATION - Perfect for clamp-on and dry pocket boiler thermostats.
HIGH QUALITY ALUMINIUM - Crafted from premium materials for superior heat dissipation.
UNMATCHED THERMAL STABILITY - Engineered for extreme conditions, ensuring optimal performance.

The Regin REG-Z20 Heat Sink Compound is a high-performance silicone compound designed for exceptional thermal stability. It operates effectively within a temperature range of -50˚C to 200˚C, making it ideal for various applications, including clamp-on and dry pocket boiler thermostats. Weighing just 25 grams and made from high-quality aluminium, this compound ensures efficient heat dissipation and reliable performance.

Specifications

Manufacturer	Regin
Part Number	REG-Z20
Package Dimensions	14.8 x 4.8 x 2.4 cm; 25 g
Item model number	REG-Z20
Item Package Quantity	1
Batteries included?	No
Batteries Required?	No
Item Weight	25 g

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