All resists we offer as well as a large number of process chemicals contain organic solvents. When handling these products, provisions of the Ordinance on Hazardous Substances are to be complied with. The safety data sheets of our products are intended to provide required data and handling recommendations for the user to take effective measures for health protection, workplace safety and environmental protection.
The most important criterion for the rating and classification as hazardous substance is the flashpoint. The flashpoint is the lowest temperature at which under previousl y described experimental conditions at normal pressure a substance may give rise to an ignitable air-gas mixture formed above this substance.
The ignition temperature is the minimum temperature to which a substance has to be heated to spontaneously ignite in the presence of air without any external source of ignition, i.e. a flame or a spark, solely as the result of being heated. The ignition temperature does not correlate with the boiling point or the flash point of a flammable substance. The ignition temperature is a measure for the sensitivity to oxidation of a substance and exceeds for most organic solvents a temperature of 200°C.
The flammable range is the concentration at which combustible gases, mist or vapours will form a flammable mixture with air. The flammable range is defined by the explosion limits, i.e. the lower and upper limit concentration at which a mixture can be ignited by heating.
Selected properties of solvents:
|
Lösemittel |
Siedepunkt |
Flammpunkt |
untere Explosionsgrenze |
obere Explosionsgrenze |
Zündtemp. |
|
|
[°C] |
[°C] |
[Vol.%] |
[Vol.%] |
[°C] |
|
Aceton |
56 |
-18 |
2,5 |
13 |
540 |
|
i-Propanol |
82,4 |
12 |
2 |
12 |
425 |
|
PGMEA |
146 |
42 |
1,5 |
7 |
314 |
|
NEP |
212,5 |
91 |
1,3 |
7,7 |
245 |
When handling organic solvents, the respective working place limit strictly has to be observed which is defined according to the German Ordinance on Hazardous Substances as the the li mit of the time-weighted average concentration of a substance in the air within the breathing zone of a worker in relation to a specified reference period. This value indicates the concentration of a substance up to which no acute or chronic harmful effects on the workers’ health in general are to be expected.