MH&W International now provides U 90 silicone-free
thermal interface materials (TIMs) with a new light tack adhesive to provide
high thermal conductivity where contamination threats prevent the use of
silicone-based thermal pads, and allow their easy positioning between
components and heat sinks.
MH&W’s Keratherm U
90 thermal interface material is a ceramic-filled polyurethane film with a
thermal conductivity of 6.0 W/mK and thermal impedance of 0.05 Kin2/W. A lower
cost version, Keratherm U 80, also silicone-free, provides 1.8 W/mK of thermal
conductivity and 0.11 Kin2/W of thermal impedance.
Both TIMs are available with a light tack adhesive to keep
them in place during assembly or pre-attached to heat sinks. The light tack
adhesive can be compared with adhesives used on repositionable notes. The TIM
pads won’t be damaged when removed from mounting surfaces, which is a common
problem when stronger adhesives are used.
The U 90 TIM with adhesive is available in thicknesses of
0.125, 0.225, and 0.325 mm; U 80 is 0.175 and 0.325 mm thick. Both TIMs are
available on roll stock or custom shaped pads.