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calcium-free high-temperature insulation
#CaOfree | #greensulation

Kavarmat - calciumfreie Isolierungen
Kavarmat Wärmetauscher Isolierung, calciumfrei
state of the art

calciumfree Insulating elements and systems are the new state of the art


paradigm shift is pending - a large part of the insulation technology used today based on knowledge of the 20th centuryand is the today's requirements and level of knowledge, especially what the emergence of  Chromium (VI) compound calcium chromate concernsno longer grown.

Kavarmat products are calcium free, because they convey a message:


The user of calcium free Insulation and high-temperature insulation systems worries about the Safety for people and the environment and turns international regulations on occupational safety and environmental protection consistently on.

calcium-free insulating materials?

The one contained in almost all common insulating materials calcium oxide  can play an unfortunate role when in the course of the applications, despite proper use, the as carcinogenic and mutagenic classified Calcium chromate (chemical formula: CaCrO4arises and in the commercially available insulating materials on the inside can drop, or as toxic and acutely harmful to the environment  dust particles remains on the insulated objects.

calcium chromate belongs to the Chromium (VI) compoundsthey are classified as carcinogenic and mutagenic; long-term skin contact or unintentional inhalation attack health and can also, depending on the intensity and time lead to serious illnesses.

The health of everyone who comes into contact with our products is important to us and because calcium-free insulation materials were developed and are available, which therefore do not trigger the emergence of calcium chromate favor, we use as

Kavarmat - the Cleansulation company exclusively only calcium-free materials!

Therefore, caution is advised if you have to handle insulating materials that have already been used.

Kavarmat calcium-free insulation
calcium-free turbocharger insulation, Kavarmat
calciumfreie Motorenisolierung Perkins



The use of calcium-free insulation systems can prevent the formation of cancer-causing heavy metal compound like calcium chromate.


hexavalent chromium compounds, mostly in the form of calcium chromate, were found as dust residue on the insulated systems (see picture), but also on the inside of the insulating elements, especially after the used insulation blankets have been removed.


The cleaning of the machine (engines, turbine, boiler, etc.) can perhaps still be managed, although it would of course be better not to let the toxic substances arise in the first place.


The used insulation materials maybe are considered to be contaminated and must be properly disposed of as hazardous waste so that no hexavalent chromium compounds can get into the groundwater!

Calcium chromate is characterized as extremely hazardous to water, with long-term consequences for the environment


Right in the picture: contaminated insulation blanket.

Chrom (VI)-contaminated insulation jacket


The formation of calcium chromate is the basis of some scientific studies:


Heating temperature dependence of the Cr (III) oxidation in the presence of alkali and alkaline earth salts and subsequent Cr (VI) leaching behavior (Bram Verbinnen, Billen ..)


The role of temperature in Cr (VI) formation and reduction when heating chromium-containing sludge in the presence of CaO (Mao, Gao, Deng ...)

In an unfortunate thermo-chemical reaction, the chromium (III) contained in many metal alloys, for example, oxidizes under certain environmental and temperature influences above 300°C with the calcium oxide contained in many conventional insulating materials and released due to thermal and environmental reasons to form a hexavalent chromium compound (CaCrO4), which then unfortunately no longer volatilizes below 800°C.

The formation process of calcium chromate and sodium chromate as a component of thermal insulation in connection with stainless steel bodies is explained particularly clearly in the following elaboration, the original of which is available to us (extract):



It has been shown that hexavalent chromium compounds occur at the contact surfaces between stainless steel and insulating materials at higher temperatures .


Yellowish residues were confirmed on the surfaces between bodies containing chromium and insulating materials and identified as hexavalent chromium compounds .


The proportion of hexavalent chromium compounds increased with the chromium content , the heat treatment temperature and the heat treatment time .


The compounds that formed as a result of the reaction were calcium chromate (CaCr04) and sodium chromate (Na2Cr04) for insulation materials containing calcium and sodium, respectively .



In order to prevent this process , it is important to isolate all calcium compounds from stainless steel bodies. First companies have already started to replace calcium-containing materials on objects to be insulated with non-calcium-containing materials .

chromium (VI)-particles on an insulation jacket
chromium VI on insulation mat
Chrom (VI)-particles on an engine
Kavarmat #pure

Commercially available insulation systems are often provided with various coatings such as silicone or Teflon (PTFE).

However, these coatings are also often exposed to higher temperatures, which thermochemically attack this so-called "finish", in the worst case decomposes and can also lead to the formation of highly toxic vapors.

So hydrofluoric acid vapors can be released for example, when PTFE is exposed to higher temperatures, .


The silicone coating is also only heat-resistant up to approx. 260°C, as is the polyurethane coating that has been popular up to now.

With all coatings and laminations, harmful vapors are often released, which cannot and must not be the property of sustainable insulation.


We therefore decided in 2022 to develop Kavarmat #pure, an insulation system that is not only free of binders but also completely free of coatings and can therefore guarantee all-round permanent heat resistance of more than 800°C for our product line Kavarmat #pure.

Kavarmat #pure

calcium-free engine insulation Perkins

engine and exhaust pipe insulation, made of #Bergkristall - high-temperature quartz fibermats and tissues (engine type: Perkins), CHP

calciumfree engine insulation for MAN

engine and exhaust pipe insulation, made of #Bergkristall - high-temperature quartz fibermats and tissues (engine type: MAN), CHP

calciumfree CHP engine insulation MAN

engine and exhaust pipe insulation, made of #Bergkristall - high-temperature quartz fibermats and tissues (engine type: MAN), CHP

calcium-free engine insulation CHP for MAN

engine and exhaust pipe insulation, made of #Bergkristall - high-temperature quartz fibermats and tissues (engine type: MAN), CHP

calciumfree insulation boat engine SCR, Volvo Penta

engine and exhaust pipe insulation, made of #Bergkristall - high-temperature quartz fibermats and tissues (engine type: Volvo Penta), SCR

#Bergkristall high-temperature quartz fibermats and tissues, heat resistant up to 800°C

calcium-free high temperature quartz fibermats and tissues #Bergkristall

calcium-free insulation blankets
calcium-free engine insulation
cone insulation, calcium-free

Kavarmat products, which are used to manufacture engine and turbine insulation, are calcium-free and heat-resistant up to at least 800 ° C


And another side effect when using Kavarmat high-temperature insulation elements: it doesn't itch!




The chromium (VI) compounds as calcium chromate, sodium chromate or potassium chromate could be therefore only formed during the application of thermal insulation , provided they contain calcium, sodium or potassium or their oxides, mostly in a temperature range of 300 ° C-600 ° C; but this development can logically be prevented if the reaction partner who is responsible for the development process is simply not available:


No calcium - No calcium chromate

No sodium - No sodium chromate

No Potassium - No Potassium Chromate


And because we understand this formula, we continue to do everything in our #greensulation!

Kavarmat products are free of calcium , sodium and potassium !


Kavarmat insulation element
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