iTEX WATERSTOP offers effective splash and condensation protection for thermal and acoustic insulation. Our smart technology with its lotus effect (also known as hydrophobicity) ensures that insulating bodies stay dry and keeps salt, dirt and dust particles out. The benefits are improved durability, reduced fuel consumption and lower emissions, not to mention highly efficient insulation.
iTEX WATERSTOP represents a particularly useful and sensible addition for thermoacoustic insulation systems and the perforation of the outer liner (AKUSTOP technology) these involve.
Only a dry insulating body can provide optimum insulation. Moisture is especially damaging for acoustic insulation systems with perforations, but also for closed insulation systems in vehicle underbodies, e.g. for diesel particle filters, SCR modules or all kinds of sound absorbers.
There are various reasons for this, as we will show.
To achieve the full thermal effect, insulation must be completely warmed through. If water then gets into the insulation, it must be evaporated.
This loss of energy causes increased emissions and regeneration time, especially in the warming-up phase.
To achieve the full thermal effect, insulation must be completely warmed through. If water then gets into the insulation, it must be evaporated. This requires energy, and therefore takes valuable heat from the exhaust system, as the following illustration shows.
QISO = m ・ cp ・ ΔT
Only when the amount of heat the insulation needs to absorb is minimised can the exhaust system retain the maximum amount of energy.
This loss of energy causes increased emissions and regeneration time, especially in the warming-up phase. This in turn necessitates a greater post-injection volume.
The marked drops in temperature in the exhaust system during the new European driving cycle with start-stop (NEDC) come from damp/damaged insulation which requires more energy to be fully effective.
Insulation that is not hydrophobic allows dirt and dust particles to penetrate the insulating body.
Salt and rust crystals and other deposits then form that chemically attack components and can cause mechanical damage to the insulating fibres due to the increased friction on the crystals. Heavy salt deposits also increase the thermal conductivity, which has a knock-on effect on the effectiveness of the insulation.
Measurements have shown:
95 % fewer salt deposits and 99.75 % less water absorption
Comparison: Thermal conductivity
|Standard insulating shel||0,180 W/m・K at 800 °C|
|NaCl salt crystal||6,49 W/m・K at 16 °C|
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