4-trans-(4-trans-Propylcyclohexyl)-cyclohexancarbonic acid

Additional physico-chemical information

Link to relevant study record(s)

Reference

Type of information:

experimental study

Adequacy of study:

supporting study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

test procedure in accordance with national standard methods

Qualifier:

according to guideline

Guideline:

other: DIN EN 61241-2-2 (VDE 0170/01871 Part 15-2-2)

Deviations:

no

Qualifier:

according to guideline

Guideline:

other: VDI 2263, page 1: Staubbrände und Staubexplosionen; Untersuchungsmethoden zur Ermittlung von sicherheitstechnischen Kenngrößen von Stäuben

Deviations:

no

GLP compliance:

no

Results:

test item dry: KSt = 183 bar*m/s, 10 < MZE < 30, no conductive dust; test item toluene-damp: KSt = 195 bar*m/s, 10 < MZE < 30, no conductive dust

Table 1: Results

	UEG / g/m^3	Pmax / bar	KSt-Value (dust explosion class St) / bar*m/s	MZE (I – with inductance) / mJ	Conductivity
Test item, dry	20	7.5	183 (St 1)	10 < MZE < 30 I: 30 < MZE < 100	no conductive dust
Test item, toluene-damp	20	7.5	195 (St 1)	10 < MZE < 30 I: 100 < MZE < 300	no conductive dust

UEG = lower explosion limit

P_max = maximum explosion pressure

K_St-value = constant (test item and test procedure specific)

MZE = minimum ignition energy

 

Conclusions:

The test item is assigned to dust explosion class St 1 and classified as normally sensitive to ignition. The test item is not classified as conductive dust.

Executive summary:

A study was conducted according to German standard methods VDI 2263, Page 1: "Staubbrände und Staubexplosionen, Gefahren - Beurteilung - Schutzmaßnahmen; Untersuchungsmethoden zur Ermittlung von sicherheitstechnischen Kenngrößen von Stäuben" and DIN EN 61241-2-2 (VDE 0170/0171 Part 15-2-2) to determine explosion characteristics of the test item. The experimental determination of the explosion characteristics was performed in a closed 20 L explosion sphere. The test item dust is blown into the sphere from a dust storage container by means of compressed air at 20 bar overpressure via a dust distribution device. Pyrotechnic primers which are electrically ignited serve as ignition initiators.

The MZE (= minimum ignition energy) is determined using the MIKE 3 test apparatus. A modified Hartmann tube made of glass with a volume of 1.2 dm³ is used as the explosion vessel.

The samples of the test item are explosive and are assigned to dust explosion class St 1 on the basis of the K_St values of 183 bar*m/s and 195 bar*m/s respectively. With regard to the minimum ignition energies of 30 mJ < MZE < 100 mJ and 100 mJ < MZE < 300 mJ determined without inductance, these two dust samples are classified as normally sensitive to ignition. According to the results of the resistance measurements, both samples are not classified as conductive dust.

Description of key information

The test item is assigned to dust explosion class St 1 and classified as normally sensitive to ignition. The test item is not classified as conductive dust (reference 4.27-1).

Additional information

A study was conducted according to German standard methods VDI 2263, Page 1: Staubbrände und Staubexplosionen, Gefahren - Beurteilung - Schutzmaßnahmen; Untersuchungsmethoden zur Ermittlung von sicherheitstechnischen Kenngrößen von Stäuben and DIN EN 61241-2-2 (VDE 0170/0171 Part 15-2-2) to determine explosion characteristics of the test item. The experimental determination of the explosion characteristics was performed in a closed 20 L explosion sphere. The test item dust is blown into the sphere from a dust storage container by means of compressed air at 20 bar overpressure via a dust distribution device. Pyrotechnic primers which are electrically ignited serve as ignition initiators.

The MZE (= minimum ignition energy) is determined using the MIKE 3 test apparatus. A modified Hartmann tube made of glass with a volume of 1.2 dm³ is used as the explosion vessel.

The samples of the test item are explosive and are assigned to dust explosion class St 1 on the basis of the K_St values of 183 bar*m/s and 195 bar*m/s respectively. With regard to the minimum ignition energies of 30 mJ < MZE < 100 mJ and 100 mJ < MZE < 300 mJ determined without inductance, these two dust samples are classified as normally sensitive to ignition. According to the results of the resistance measurements, both samples are not classified as conductive dust (reference 4.27-1).