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Polyken 231 Military Grade Duct Tape: 3 in. x 60 yds. Black - Polyken 231 Military Grade Duct Tape is a high performance, waterproof packaging and sealing duct tape used for military and aerospace packaging and other demanding applications. It can also be used for media blast protection & surface masking and for other challenging repair, bundling and seaming applications (such as tarps). Polyken 231 Duct Tape benefits include: high tensile strength; extremely conformable; crisp, straight tear; moisture, solvent & abrasion resistant; and has aggressive adhesion to most surfaces. It is manufactured to conform to ASTM D -5486 Type IV Class 1 (supercedes PPP-T-60D & E Type IV, Class 1) and to DPM 871-3. Also please note that Polyken 231 comes to our converter in jumbo log roll format (that is why non-standard widths can be offered) and because of that rolls will ship on non-branded plain white cores. The shelf life on these rolls cut from source log roll material of 231 is one year from the manufacturer date. For the special-order 2" and 3" 231 which comes on a branded Polyken core the shelf life is three years from the manufacturer date. NSN 7510-00-074-4961.