①GD type (straight rod with single hot zone )
d hot zone diameter
I hot zone length
m cold end length
n Al – sprayed length
L overall length
Product marking: GD d/I /m
If the length of cold end is not equal, then GD: d / I / m1 or m2
②GD type (dual type with double hot zone )
d hot zone diameter
m 1 cold end length
I 1 hot zone length
m 2 lower temperature part length
I 2 hot zone length
m 3 cold end length
n Al – sprayed
L overall length
Product marking: GD: d/m1 /I1 /m2 /I2/m3
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