Highly alloyed austenitic steels (alloys of chrome, nickel and molybdenum) are predisposed to tensile stress corrosion (stress corrosion cracking), caused mainly by water soluble ions, such as chlorides. As temperature increases, so does the risk of stress corrosion cracking. All KIMMCO-ISOVER industrial products are therefore low in chlorides.
Moisture and water repellence
Standards and guidelines
- ASTM C 795, for instance, concerns the water-leachable content of chloride, sodium and silicate ion's.
- The so-called Karnes diagram defines an acceptable area which is identified as not supporting stress corrosion. All ISOVER industrial solutions fall within the acceptable area.
- AS-Quality (AGI-Q 132): even more demanding is the AGI-Q 132 which sets the maximum content of chloride ions at 10ppm or 10mg per 1 kg of insulation material. Insulation materials which satisfy this standard are certified for AS-Quality. Austenitic (AS) is a term which describes a particular type of crystalline steel structure. ISOVER has certified nearly all of its products for high-temperature usage as AS-Quality - giving additional safety to highly demanding constructions.