All firework applications submitted for approval to the U.S. Department of Transportation will need to describe the particle (micron) size for any metal composition used in a device. The following chart provides the conversion for standard entries from mesh to microns.
Example: Titanium is required to be larger than 100 mesh in a 1.4G device, the equivalent conversion would be 149 microns.
|
US MESH |
INCHES |
MICRONS |
MILLIMETERS |
|
50 |
0.0117 |
297 |
0.297 |
|
60 |
0.0098 |
250 |
0.250 |
|
70 |
0.0083 |
210 |
0.210 |
|
80 |
0.0070 |
177 |
0.177 |
|
100 |
0.0059 |
149 |
0.149 |
|
120 |
0.0049 |
125 |
0.125 |
|
140 |
0.0041 |
105 |
0.105 |
|
170 |
0.0035 |
88 |
0.088 |
|
200 |
0.0029 |
74 |
0.074 |
|
230 |
0.0024 |
63 |
0.063 |
|
270 |
0.0021 |
53 |
0.053 |
|
325 |
0.0017 |
44 |
0.044 |
|
400 |
0.0015 |
37 |
0.037 |
NOTE(s):
**** Titanium - particle size must be larger than 149 microns
**** Particle size must be provided for all metals in the Fireworks (EX) Approval Application