Technical Rules for Hazardous Substances
First Requirements for water-miscible fluids in the state in
1.1 Absence of nitrosating agents
Water-miscible cutting fluids may not Nitrosierungsagenzien or their precursors (such as nitrites or nitritabspaltende Subtanzen eg certain organic nitro compounds such as 2-methyl-2-nitro-1 ,3-propanediol, 2-ethyl-2-nitro-1 ,3-propanediol, 2-bromo-2-nitro-1 ,3-propanediol, 2-hydroxymethyl-2-nitro-1 ,3-propanediol morpholine, 4 (2-nitrobutyl), 4,4 - (2-2Ethyl nitrotrimethylen) dimorpholine and 5 -Me ¬ methyl-5-nitro-1 ,3-dioxane) included.
1.2 content of secondary amines
Water-miscible cooling lubricants must not contain secondary amines as components.
The content of secondary amines in water-miscible cutting fluids, resulting from impurities or minor components may, O, 2% by weight (based on the cooling lubricant concentrate) is not exceeded. ¬ This limit applies, mutatis mutandis, for so-called "masked" secondary amino ne, that is, those with conditions such as released by hydrolysis, in considerable quantity from other compounds.
Secondary amines, which are demonstrably impossible or very difficult to not come into nitrosatable or carcinogenic N-nitrosamines nitrosation will be exempt from this restriction.
Primary amines are regarded as suitable substitutes for preferred secondary amines because nitrosation which does not lead to stable N-nitrosamines. Moreover, can be assumed in the prior derzei ¬ term scientific knowledge that primary amines inhibit the formation of N-nitrosamines from dekundären amines due to their inhibitory effect.
The use of tertiary amines which contain at present as impurities or secondary amines, should be taken to ensure the highest possible purity of the technical product.
1.3 Inhibitors of the formation of N-nitrosamines
Metalworking fluid formulations, the inhibitors to an extent which suppress evidence the formation of N-nitrosamines during use, shall be exempted in paragraph 1.2 above restrictions for secondary amines, the inhibitory effect in each individual ¬ falling for the respective coolant formulation must be tested.
Second Surveillance and protection measures when using coolant lubricants water mixture
2.1 Obligations of the employer
The employer must ensure, in accordance with § 16 para 1 GefStoffV that the coolant used in substance-the requirements of the TRGS enough.
2.2 avoid skin contact
With the passage of skin cooling lubricants N-nitrosamines, an important significance is attached. For this reason, the skin contact should be limited to the unavoidable minimum.
2.3 nitrate content of the preparation water
That for the preparation of cooling lubricant emulsions and solutions or for refilling used water ¬ What can a nitrate level of 50 mg / l does not exceed (corresponding to the maximum value for nitrate in drinking water regulation). The nitrate content of the replenishment water is added initially or check from time to time. Have a lower nitrate level is desirable.
2.4 Monitoring the nitrite content
The nitrite content of the used emulsion or solution must be monitored weekly. In case of ¬ exceeds a value of 20 mg nitrite / l is an exchange or part exchange of water-mixed cooling lubricant, perform or to add a suitable inhibitor. For a complete exchange of the emulsion or solution system is the use of system cleaners to clean.
2.5 N-nitroso-diethanolamine (NDELA) content in water-mixed cooling lubricant
The content of N-nitroso-diethanolamine (NDELA) in the used water-mixed cooling lubricant must 0.0005% (5 ppm) do not exceed. The NDELA content of max. 0.0005% (5 ppm) is considered met if the used water-mixed cooling lubricant is not more than 20 mg / l of nitrite.
As far as the exchange referred to in paragraph 2.4, part replacement or addition of substances ¬ ihibitierenden not done Fen, the NDELA content in the used water-mixed cooling lubricant and the NDELA concentration must be determined in the air.
2.6 Avoidance of the introduction or formation of Nitrosierungsagenzien
The penetration of Nitrosierungsagenzien in water-mixed cooling lubricant and the formation of water-mixed cooling lubricant in Nitrosierungsagenzien increase the risk of formation of N-nitrosamines and should therefore be avoided whenever possible.
Rule 611 of Nitrosierungsagenzien external sources, eg Nitrogen oxides (as a result of the operation of internal combustion motors ¬, gas or diesel-powered forklifts, etc., as well as cigarettes and other tobacco smoke) are kept away.
The introduction of nitrite-containing inorganic and organic corrosion inhibitors, detergents, salts and hardness of such food and beverage products and other organic substances in coolant systems will be possible largely suppressed. The Reinigungsein ¬ units (eg, rinsing) are regularly checked for any residual nitrite content.
Components, the water-mixed cooling lubricants are added during the application must also contain no Nitrosierungsagenzien.
In certain cases, the microbial reduction of nitrate and nitrite plays a significant role. It should be avoided whenever possible, eg by using lubricants as microbially resistant ¬ cooling, through a regular inspection and maintenance of used emulsions or solutions and by appropriately designed circulation systems for emulsions and solutions.
Should also be avoided as far as possible intrusions of foreign oil in coolant systems ¬.
2.7 Under the binding of secondary amines
Included the introduction of foreign substances and impurities, secondary amines or release significant amounts (eg, certain anti-corrosion agents, cleaning agents or other Rei ¬ ing agents), is to be prevented. This also applies to components that are water-mixed cooling lubricants ¬ materials are added during the deployment.
2.8 Temperature in the emulsion or solution system
Elevated temperatures promote the formation of N-nitrosamines and should therefore be avoided. The temperature in emulsion or Lösungssystmen should not exceed certain performance limits caused by technical, eg 40 ° C for many machining operations, and 60 ° C during hot rolling of aluminum.
PH 2.9
Low pH values favor the formation of N-nitrosamines. A significant decrease in the pH value is therefore avoided.