For substances that are mutagenic, toxic to reproduction and carcinogenic, no limit values can be defined as exposure to even very small quantities may produce the above-described effects. The Regulation relating to Limit Values (Grenzwerteverordnung, GKV) specifies technical standard concentrations which are oriented to the technical conditions and options existing at workplaces. However, substitution by another substance is always preferable (irrespective of the costs involved). Technical indicative concentration values are fundamentally different from maximum concentration values.
