70HDT-1X30FT 3M

Self-Fusing Silicone Rubber Electrical Tape 70 HDT with Tapered Edge Data Sheet - PVC 1.0 Product Description - Low and high-density polyethylene Scotch Silicone Rubber Electrical Tape 70 cross-linked HDT is a high-temperature arc-and track- resistant tape composed of self-fusing, As primary insulation where Class inorganic silicone rubber and easy-tear ( 80C/356F) temperatures are and easy-strip liner. The 70 HDT product encountered i.e., silicone rubber cables. also has a triangular (tapered edge) profile As splice o verwrap on spacer cable and blue guidelines to make half-lapping operating at 5 kV and abo ve. application easier. 3.0 Data Tape Features Scotch 70 Tape has a peak thickness of 20 Excellent track resistance mils, an edge thickness of 8 mils, and a blue Excellent arc resistance center guideline. It is available in roll size Excellent ozone resistance in. wide x 30 ft. long. The core is in. I.D. High dielectric strength Class H material 4.0 Specifications ( 80C continuous operation) Product Workable at extremely low temperatures The insulating tape must be composed Excellent conformability of self-fusing, inorganic silicone rubber Excellent instantaneous fusion does not with an easy-tearing and easy-stripping need to be held down polyester liner. The product must be Sky Matches Sky Blue Gray Munsell Blue Gray and conform to Munsell Color 5BG7.0/0.4 No.5BG7.0/0.4. The tape must be capable Excellent weathering characteristics of operating continuously at Class H AA-5963 Class-I Type-II temperatures ( 80C/356F). The tape must be compatible with all synthetic cable insulations as well as cable splicing 2.0 Applications compounds. As an o verwrap for protection of terminating high-voltage cables against Engineering/Architectural Specifications arcing and tracking. High-voltage cables with these insulations should be All tape or tape-like terminations which overwrapped: will be operated either outdoors or in areas subjected to contamination or moisture shall - Butyl rubber be overwrapped with at least one layer of - Oil-base rubber Scotch Silicone Rubber Electrical Tape 70 - Ethylene propylene rubber HDT. Page of 4 The exposed cable insulation on the lug Dielectric Constant side of assembled stress cone kits, which Table 2 shows the dielectric constant versus will be operated either outdoors or in areas temperature of 70 HDT Tape. This test was subjected to contamination or moisture, run according to ASTM-D- 50-8 at a stress shall be overwrapped with at least one layer of 50 V/mil and a frequency of 60 cycles of Scotch Silicone Rubber Electrical Tape per second. 70 HDT. Dielectric Constant vs. Temperature All splices on spacer cable operating at 5 Scotch 70 HDT Tape kV and above shall be overwrapped with Temperature Dielectric Scotch 70 HDT Tape. (C/F) Constant 23/73 3.0 All splices on silicone rubber cables or 90/194 2.9 other cables which can operate at room 130/266 2.6 temperatures in excess of 30C/266F , 150/302 2.5 but not exceeding 80C/ 66F , shall Table 2 use Scotch 70 HDT Tape as the primary insulating material. 6.0 Performance Tests Termination Tracking Test 5.0 Characteristics and Test Data Reduced-dimension terminations are Typical Electrical and Physical Properties prepared according to 3M print 2047-B-6 (Se Figure ). Each specimen consists of 8 Physical Properties feet of 5 kV cable and two terminations. Color Munsell 5BG7.0/0.4 Sky Blue Gray The contaminant employed in this test is the Thickness - Peak .020 in. ASTM-D-2148 formula called out in ASTM Dust and Fog Test D-2 32, as shown below: Thickness - Edge .008 in. ASTM-D-2148 Flint (SiO floated) 240 mesh 85 parts 2 Tensile Strength 1000 psi ASTM-D-412 Clay 325 mesh 9 parts Elongation at Break Salt (Na Cl) technical grade 3 parts 300% ASTM-D-412 Paper, filter pulp 3 parts Electrical Properties all by weight Dielectrical Strength 600 V/mil This mixture is then ball milled using 3/4 ASTM-D-2148 inch diameter ceramic cylinder. The milled Arc Resistance 1 min. (minimum) dust is then mixed with equal parts by ASTM-D-495 weight of water to make a slurry of paint Fusion (Self Adhesion) 0.125 in. consistency. ASTM-D-2148 Volume Resistivity Next, each termination is carefully coated in 14 7 x 10 ohmcm ASTM-D-1458 such a manner as to deposit a uniform and reproducible amount of contamination. The following procedure is used: Dissipation Factor Table shows the dissipation factor versus . Mix the slurry thoroughly. temperature of 70 HDT Tape. This test was run 2. Submerge the inverted termination into according to ASTM-D- 50 at a stress of 50 V/mil the slurry. and a frequency of 60 cycles per second. 3. Withdraw the termination from the slurry, taking care not to throw off Dissipation Factor vs. Temperature too much excess slurry in rotating the Scotch 70 Tape termination from the inverted to an Temperature Dissipation upright position. The majority of the (C/F) Factor excess slurry should drain off when the 23/73 1.3% 90/194 1.1% termination is upright. 130/266 0.5% 150/302 0.7% Table 1 Page 2 of 4