BREXIT: Hot topic
Worried about Brexit fallout on chemicals regulation?
Find what experts have to say on this topic. Learn how to prepare for all potential Brexit outcomes.

2.6.4.: Additional Classification Considerations

2.6.4.1. For the classification of flammable liquids data on flash point and initial boiling point are needed. Data can be determined by testing, found in literature or calculated. If data are not available, the flash point and the initial boiling point shall be determined through testing. For flash point determination a closed-cup method shall be used.
2.6.4.2. ►M2  In the case of mixtures ( 5 ) containing known flammable liquids in defined concentrations, although they may contain non-volatile components e.g. polymers, additives, the flash point need not be determined experimentally if the calculated flash point of the mixture, using the method given in 2.6.4.3, is at least 5 °C ( 6 ) greater than the relevant classification criterion (23 °C and 60 °C, respectively) and provided that: ◄
(a) the composition of the mixture is accurately known (if the material has a specified range of composition, the composition with the lowest calculated flash point shall be selected for assessment);
(b) the lower explosion limit of each component is known (an appropriate correlation has to be applied when these data are extrapolated to other temperatures than test conditions) as well as a method for calculating the lower explosion limit ►M2  of the mixture ◄ ;
(c) the temperature dependence of the saturated vapour pressure and of the activity coefficient is known for each component as present in the mixture;
(d) the liquid phase is homogeneous.
2.6.4.3. One suitable method is described in Gmehling and Rasmussen (Ind. Eng. Fundament, 21, 186, (1982)). For a mixture containing non-volatile components the flash point is calculated from the volatile components. It is considered that a non-volatile component only slightly decreases the partial pressure of the solvents and the calculated flash point is only slightly below the measured value.
2.6.4.4. Possible test methods for determining the flash point of flammable liquids are listed in Table 2.6.3.


Table 2.6.3

Methods for determining the flash point of flammable liquids

European standards:

EN ISO 1516 as amended

Determination of flash/no flash — Closed cup equilibrium method

EN ISO 1523 as amended

Determination of flash point — Closed cup equilibrium method

EN ISO 2719 as amended

Determination of flash point — Pensky-Martens closed cup method

EN ISO 3679 as amended

Determination of flash point — Rapid equilibrium closed cup method

EN ISO 3680 as amended

Determination of flash/no flash — Rapid equilibrium closed cup method

EN ISO 13736 as amended

Petroleum products and other liquids — Determination of flash point — Abel closed cup method

National standards:

Association française de normalisation, AFNOR:

NF M07-036 as amended

Détermination du point d'éclair — Vase clos Abel-Pensky

(identical to DIN 51755)

▼M2 —————

▼B

Deutsches Institut für Normung

DIN 51755 (flash points below 65 C) as amended Prüfung von Mineralölen und anderen brennbaren Flüssigkeiten; Bestimmung des Flammpunktes im geschlossenen Tiegel, nach Abel-Pensky

(identical to NF M07-036)

2.6.4.5 Liquids with a flash point of more than 35 °C and not more than 60 °C need not be classified in Category 3 if negative results have been obtained in the sustained combustibility test L.2, Part III, section 32 of the UN RTDG, Manual of Tests and Criteria.
2.6.4.6. Possible test methods for determining the initial boiling point of flammable liquids are listed in Table 2.6.4.


Table 2.6.4

Methods for determining the initial boiling point of flammable liquids

European standards:

EN ISO 3405 as amended

Petroleum products — Determination of distillation characteristics at atmospheric pressure

EN ISO 3924 as amended

Petroleum products — Determination of boiling range distribution — Gas chromatography method

EN ISO 4626 as amended

Volatile organic liquids — Determination of boiling range of organic solvents used as raw materials

Regulation (EC) No 440/2008 (1)

Method A.2 as described in Part A of the Annex to Regulation (EC) No 440/2008

(1)   OJ L 142, 31.5.2008, p. 1.