Page 78 - GETELEC catalogue US 2020

Introduction

GETELEC formulates its own silicone mixtures and transforms them itself, thus ensuring we can provide bespoke
solutions for our customers.We use specific grades of silicone as the basis of our formulations. Our laboratory and
research center support customers from selection of material through to the choice of transformation procedure. Having
in-house control of the various processes (extrusion, cutting, moulding, injection, automatic placement, vulcanization
onto the cover etc.) ensures we are able to provide a bespoke solution for your environment.

THE ADVANTAGES OF SILICONE

• Resistance to heat : Silicones' thermo-oxidative stability is considerably superior to that of classical organic
molecules. For example, continuous temperature resistance, in the absence of other constraints, can be
estimated as follows : EVC silicone elastomers.........180 – 250°C

• Resistance to light and ozone-induced natural ageing : The light-resistance of HCR ( High cured reticulation)
in the absence of other constraints can be estimated as shown on a scale of 1 (weak resistance) to 5 (good
resistance): HCR silicone elastomers...........4.5

• Resistance to chemicals : In the absence of acidic or basic catalysts, silicones have very good hydrolytic
stability. This explains their use in medical and paramedical applications and physiological settings as well as
their employment for the manufacture of packaging for certain food and cosmetics products.

• Low temperature-induced loss of properties : Their viscosity, dielectric properties, thermal capacity etc.
change less with temperature than many other polymers.

• Permeability and gas absorption : Elastomers' gas permeability and silicone fluids' gas absorption are
relatively high.

• Dielectric properties : Silicones are naturally good insulators, even though it is possible to make them
conductive by incorporating conductive loads.Their electrical properties fall on average within the following
ranges:
- volume resistivity .................... 10 to 10 Ohms/cm
16
12
- dielectric constant .................. 1 to 4
- loss factor ................................... 2 to 200.10
-4
- dielectric strength ................... 10 to 30 kV/mm
• Fire resistance : Silicones have better natural fire resistance than polyolefins. Silicones also have the
advantage of forming a silicic skeleton which may work as the final barrier to the propagation of fires and
maintain electrical insulation, for cable sheaths, for example.

• Physiological safety : The carefully chosen grades of silicone comply with all necessary European and
American standards for medical, pharmaceutical, paramedical and food applications.

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