Information

Volksbank Raiffeisenbank Nordoberpfalz Sitz: 92676 Eschenbach KERAFOL Verwaltungs-GmbH | Sitz: 92676 Eschenbach
IBAN: DE27 7539 0000 0001 0410 45 Reg. Gericht Weiden: HRA 2846 Reg. Gericht Weiden: HRB 5098
UST-ID: DE815771797 Geschäftsführer: Franz Koppe, Isabell Koppe, Sabine Koppe
Processing and handling notes of Keratherm® thermal grease
(KP 12, KP 97, KP 98, KP 99) in different packagings
Keratherm® thermal compounds are silicone or mineral oil based compounds, highly filled with ceramic particles and
optimized for customers’ application. These products have a high thermal conductivity in the case of a low viscosity. Optimal
adapting on component surfaces and compensation of smaller unevennesses are guaranteed.
Physiological notes:
Thermal greases of Kerafol® comply with valid RoHS and REACH compliance requirements.
Oils included in the thermal greases are physiologically safe.
No exposure of air is expected when using a thermal grease.
Contact to eyes and skin should be prevented by appropriate protective measures.
Using skin protection salves or other appropriate measures is recommended.
Please have a look at the references in the safety data sheets of each thermal grease.
Surface quality in application:
The component surface need to be dry and free of contaminations like oil, grease, dust, paint layers and solvent
contaminations. Condensing humidity (e.g. by temperature variations) must be avoided. Depending on the condition of the
component, a mechanical or chemical cleaning of the surface is eventually necessary. Please be attentive using porous heat
sink or casing parts because cappilar ascension in the porous surfaces may occur due to already explained migration
abilities of the compounds.
Pretreatment:
Thermal greases of Kerafol® have a low viscosity and include fillers which are proned to separate to a certain level
depending on storage temperature. Therefore a careful mixing process before processing is required. No binding
specifications for mixing speed are present. 200-300 rpm can be used as a guidline. The mixing process have to be done
smoothly to avoid air incorporation. Otherwise an evacuation process (100 mbar, ca. 5 minutes) is necessary.
Please note: Thermal greases filled in syringes and cartouches cannot be remixed.
Application:
The thickness of the thermal grease should be measured that the thermal grease fills the hollow space between the two
components but not increase the distance. The most frequently error is to use too much thermal grease. The most common
layout is a dot and/or a rhomb application. Therefore the viscosity and the ability of the thermal grease to level out under
pressure are decisive.
The dot application was choosen for low viscosity greases, realizing thin layers (10 – 20 µm) and covering big areas.
The rhomb application was used for middle to high viscosity greases and realizing higher layer thicknesses (25 – 50 µm).
Thermal greases are of limited suitability for screen printing and therefore for very high layer thicknesses. In general
laboratory tests need to be done to find the right layout and application.
The application of a dot and a rhomb structure with thermal grease can be done by half automated dispensing units. At high
piece numbers dispensing was done on components of loaded circuit boards or on single components. After application
thermal greases do not need an additional thermal treatment. Moreover fixed components should not stored over a long time
line to minimize contamination or damage of the component surface and consequently a change in material performance.
Applying the dispensed components to the chassis or the heat sink need to receive attention, due to the used contact
pressure a levelling of the gap width take place, which have to be compensated by screws combined with springs or self-
regulating clamps.
Thermal grease is not recommendable for applications with higher gap width (> 30 µm).
Processing temperature:
Keratherm® - products must be processed at temperature range from +18°C and +35°C at a relative humidity of 30 – 70%.
At different temperature or humidity changes of the applying behaviour of the compounds may occur.