Introduced in the 1950's as a durable retro reflective sheeting to enhance the visibility of traffic signage at night. 3M™ Engineer Grade Reflective Sheeting Series 3270 with pressure sensitive adhesive backing is a durable material with enclosed lens glass beads, designed to be used where maximum brightness at night is not required and in areas of light traffic with little ambient lighting. Application to standard traffic sign substrates with a hand or pneumatic squeeze roller applicator. Meets ASTM D4956 Spec Type I, Class 1.

3M™ High Intensity Grade Reflective Sheeting Series 3870
Rating: Very Good

Introduced in the 1970's. This retro reflective sheeting is 3 times more reflective than Engineering Grade sheeting.  3M™ High Intensity Grade Reflective Sheeting Series 3870 is highly reflective, encapsulated lens sheeting with pressure sensitive adhesive backing for application to standard traffic sign substrates using a hand or pneumatic squeeze roller applicator. Extremely cost-effective signing material, at least three (3) times brighter than conventional enclosed lens reflective sheeting, effective in lighted areas with moderately high speed limits and levels of surround light. Clearly visible at viewing angles of 30 degrees or more and effective on signs positioned at wide angles to approaching traffic or misaligned due to impact or age. Meets ASTM D4956 Spec Type III, Class 1.

3M™ High Intensity Grade Prismatic Reflective Sheeting Series 3930
Rating: Very Good

3M™ High Intensity Prismatic Reflective Sheeting Series 3930 with pressure sensitive adhesive is nonmetalized microprismatic lens reflective sheeting designed for production of reflective durable traffic control signs, work zone devices and delineators that are exposed vertically in service. Applied to properly prepared sign substrates, it provides longterm reflectivity and durability with an improved optical package to increase nighttime safety. Its unique prismatic construction provides a high level of retroreflectivity for multiple traffic control situations. Meets both ASTM D4956 Type III and Type IV specifications.

3M™ Diamond Grade™ VIP Reflective Sheeting Series 3990
Rating: Excellent

3M™ Diamond Grade™ VIP Reflective Sheeting Series 3990 is a highly reflective, durable, microprismatic lens sheeting with pressure sensitive adhesive for application to aluminum, using a hand or pneumatic squeeze roller applicator. Signs are highly visible, even in visually complex nighttime roadway environments. Microprismatic lens optics have higher sign brightness than sheeting made with glass bead optical elements and are highly visible in the viewing range of 200 to 600 feet. It is ideal for signs in locations with relatively short viewing distances. Exceeds ASTM D4956 Spec Type IX standards.