Datasheet
Technical data sheet for WACKER® SILICONE PASTE P 12 / Version: 1.9 / Date of last alteration: 02.02.2017 1 / 2
Product description
Pure white, soft consistency, heat sink paste with
marked thermal conductivity. Electrically insulating.
Application
WACKER® SILICONE PASTE P 12 is used especially
in semiconductor technology as a heat sink paste.
Wherever it is important to have good heat transfer
from a semiconductor to a cooling element, it is
advisable to apply a thin coating of WACKER®
SILICONE PASTE P 12. In the assembly of
semiconductors, e. g. diodes, transistors and
thyristors, microscopic elevations exist on the mating
surfaces of the semiconductor and the cooling surface
if they have not been grounded and polished. When
these surfaces are placed together, a firm metal-to-
metal contact will result only where there are these
elevations. 40 - 60 % of the surface is thus not in direct
contact, depending on the roughness. This means that
the hollow spaces in between these elevations are
filled with air, which has relatively poor thermal
conductivity.
By coating the contact surfaces with WACKER®
SILICONE PASTE P 12, the thermally insulating air is
replaced by the heat sink silicone paste when the
semiconductor is screwed on. The thermal conductivity
of WACKER® SILICONE PASTE P 12 is about 20
times better than that of air. Practical experience has
shown that by using WACKER® SILICONE PASTE P
12, the heat transfer resistance from the
semiconductor housing to the cooling elements is
reduced by 50 %.
WACKER® SILICONE PASTE P 12 can be applied
with a brush, spatula or by screen printing. Best results
are achieved when a uniform, thin coat is applied to
the mating surfaces. Paste squeezed out when the
semiconductor is tightened should be removed.
For detailed information, refer to brochures on
www.wacker.com.
Storage
Further information for storage:
Store in a dry and cool place.
The 'Best use before end' date of each batch is shown
on the product label.
Storage beyond the date specified on the label does
not necessarily mean that the product is no longer
usable. In this case however, the properties required
for the intended use must be checked for quality
assurance reasons.
Safety notes
Comprehensive instructions are given in the
corresponding Material Safety Data Sheets. They are
available on request from WACKER subsidiaries or
may be printed via WACKER web site
http://www.wacker.com.
.
WACKER® SILICONE PASTE P 12
THERMALLY CONDUCTIVE SILICONE PASTE