chromium (VI)-Compounds (calcium chromate) on calcium-containing high-temperature insulation

Insulating elements, insulating mattresses, insulating fabrics, insulating wool, fibers and mats

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When dismantling insulating elements (e.g. as insulating mattresses, insulating pads, insulating pads, insulating mattresses or in other mat forms or as loose insulating materials), which are, among other things are used as turbine or engine insulation (gas turbine, steam turbine, diesel engine, gas engine and already on hydrogen engines), it cannot be ruled out to come in contact with calcium chromate, a Chromium (VI) compound,  if the insulating elements and/or materials contain calcium or calcium oxides (chemical formula: Ca or CaO) and have been in contact with chromium-containing hot parts at operating temperatures of over 350°C (e.g B. stainless steel bodies such as manifolds, turbochargers, exhaust pipes, etc.).

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More manifestations in their form than

 

sodium- orPotassium chromate (Na2CrO4or.K2CrO4)

 

cannot be excluded either.

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if the insulating elements, materials and/or systems contain other alkali or alkaline earth metals such as e.g. B. sodium (Na) or potassium (K) or oxides thereof.

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Immediate protective measures are required if yellowish dust is visible on the inside of the insulation or on the previously insulated component when removing the insulating elements. In this case, a chromium (VI) quick test must be carried out immediately. If this is positive (purple discoloration of the test stick), all measures must be taken immediately, e.g. in Germany from the so-called "Gefahrstoffverordnung" (GefStoffV) and the latest version of which you can download if you click here.

 

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