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EC number: 231-143-9
CAS number: 7440-33-7
Several tungsten metal
powder were tested using the new recommended 100 mm testing train. A
total of 32 tungsten powder samples with a Fisher Sub Sieve Size (FSSS)
ranging from 0.76 µm
to 9.8 µm. The
flammability tests were performed per UN Manual of Tests and Criteria
for Transportation of Dangerous Goods, Section 33, Classification
Procedures, Test Methods and Criteria Relating to Class 4, Test N.1:
Test Method for Readily Combustible Solids.The scope of the
laboratory’s accreditation (ISO/IEC 17025:2017) includes DOT 4.1
Ignitability and Burn Rate. Those
with particle size less than 4.35 µm fell
into CLP Cat 1 (Packing Group II) with a burning time of less than 300
seconds. Those with particle
size between 4.35 µm and 9.0 µm
fell into CLP Cat 2 (Packing Group III), with burning times between
above of 300 to 600 seconds. Tungsten
samples with particles sizes of equal to or greater than 9 µm
with a burning time above 600 seconds did not meet the Class 4.1 or CLP
flammable solid criteria.
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