Type 6 is a non adhesive, air backed, prismatic, flexible sheeting that is used for traffic control signing in temporary work zones, utility, and incident management applications. It has a Class 5 backing which simply means no adhesive. This material is used almost exclusively for roll up temporary signs. These may be used in work zones, accident zones, when utility trucks are working, and other situations where a very bright portable sign is needed.
Oralite is the leading manufacturer of this type of material, and as such, a spec sheet of their material is included below. Other manufacturers materials will have similar photo-metrics.
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oralite-roll-up-signs-technical-data-sheet oralite-marathon-roll-up-signs-technical-data-sheet 
Steven Cole (Economics, MBA – University of West Florida , Business & Innovation – Stanford University) 25 years of experience in the reflective safety business. Specializing in vehicle accident and rear end collision reduction through increased visibility.