The difference between 0.9mm tight and loose tube fiber optic cable

0.9mm tight and loose tube fiber optic cable is based on 900um and 250um buffer layer between the tightness of the coating layer to distinguish.

1 tight cable because different materials, it is 900um and 250um buffer layer between the tightness of the coating layer is also different:
PVC material: a buffer layer between the coating layer and the tightness of the cable stripping 10CM can not pull the skin
LSZH material: a buffer layer between the coating layer and the tightness of stripping 15 - 18CM cable can not be pulled out skin
Hytre; Material: between the buffer layer and the coating layer tightness, stripping 15 - 18CM cable can not be pulled out skin

2 loose cables, do not distinguish between material, it is between the buffer layer and the coating layer tightness, stripping 100CM can easily pull out the cable above the skin.
Depends on the use of two kinds of fiber optical cable.  The same type of fiber optic cable and tight-loose tube fiber optic cable using the effect is the same