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Physical & Chemical properties

Additional physico-chemical information

Administrative data

Endpoint:
additional physico-chemical information
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
May 9, 2011
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2011
Report Date:
2011

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
other: BS EN 14034 Determination of explosion characteristics of dust clouds Part 1: Determination of the maximum explosion pressure and Part 2: Determination of the maximum rate of explosion pressure rise (dp/dt) of dust clouds
Deviations:
no
GLP compliance:
yes
Endpoint investigated:
other: explosion severity of a dust cloud

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
solid: particulate/powder
Details on test material:
- Appearance: fine, off-white powder with agglomerations

Results and discussion

Results:
Mean results (n=3):
- Pmax (mean): 8.2 bar
- (dP/dt)max (mean): 979 bar*s-1

- Kst value: 979 *(0.02)^1/3=266 bar*m*s-1
- Dust explosion class (St class): 2

Any other information on results incl. tables

Test results

Concentration

(g*m-3)

Pm (barg)

(dP/dt)m

(bar*s-1)

Test series 1

60

3.4

133

125

5.5

351

250

7.3

997

500

8.4 (Pmax)

1052 ((dP/dt)max)      

750

7.8

945

1000

7.3

733

1500

6.8

635

Test series 2

125

5.2

407

250

7.4

862

500

8.2 (Pmax)

919 ((dP/dt)max)

750

7.7

834

1000

7.2

904

Test series 3

125

4.8

261

750

7.7

789

1000

7.2

906

250

7.9

862

500

8.1 (Pmax)

966 ((dP/dt)max)

Mean of test series 1-3

60

3.4

133

125

5.2

340

250

7.5

907

500

8.2 (mean)

979 (mean)

750

7.7

856

1000

7.2

848

1500

6.8

635

 

Applicant's summary and conclusion

Conclusions:
The explosion severity (maximum pressure and speed of the explosion) of a dust cloud of the test substance under specified test conditions was determined in a GLP-compliant study in accordance with BS EN 14034. As the 20 L Sphere test gave a Pmax of 8.2 bar and a Kst value of 266 bar*m*s-1, the substance falls within the dust explosion class 2 (medium explosion severity potential).