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 plain white cores. NSN 7510-00-074-4961. If not otherwise specified widths shown in dropdown are in inches. NOTES: Sizes shipped will typically be the tape industry standard metric-cut sizes, i.e. 24mm for each 1 inch of nominal tape width ordered (rolls are approximately 5% narrower than the nominal size). This product's actual size is 24mm x 55m. This tape is typically cut to width from log rolls so most sizes ship on a plain white core.