Many industrial products contain one or more preservatives. Preservation is necessary because otherwise bacteria and fungi will grow in the products.
Preservatives are found for instance in:
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Waterbased paints
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Wallpaper paste
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Cooling lubricants
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Detergents
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Varnish
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Glues and adhesives
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Timber treatment
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Various wood products such as chip board
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Impregnating agents (for clothing and leather)
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Cleaners and polishes, for example for cars and furniture
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Cosmetic products, eg. hand soaps, lotions and the like
Many preservatives can cause allergic reactions. Examples of preservatives in industrial products, which can cause allergies:
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Formaldehyde
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Formaldehyde-releasing preservatives
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Iodopropynylbutylcarbamat (IPBC)
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Methyldibromo glutaronitrile
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A combination of methylchloroisothiazolinone and methylisothiazolinone (MCI/MI), also known as "Kathon".
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Methylisothiazolinone (MI)
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Parabens
There may have been more preservatives in one product and a preservative may have many different names.