70 TAPE (1" X 30FT) 3M

70 Self-Fusing Silicone Rubber Electrical Tape Data Sheet As primary insulation where Class H 1.0 Product Description (180C/356F) temperatures are Scotch Brand 70 Silicone Rubber encountered i.e., silicone rubber cables. Electrical Tape is a high-temperature arc- As splice overwrap on spacer cable and track-resistant tape composed of self- operating at 15 kV and above. fusing, inorganic silicone rubber and easy- tear and easy-strip liner. 3.0 Data Tape features: Excellent track resistance. Scotch 70 Tape has a thickness of 12 mils Excellent arc resistance. and is available in roll size 1 in. wide x 30 Excellent ozone resistance. ft. long. The core is 1 in. I.D. High dielectric strength. Class H material (180C continuous operation). 4.0 Specifications Workable at extremely low temperatures. Product Excellent conformability. The insulating tape must be composed of Excellent instantaneous fusion does not self-fusing, inorganic silicone rubber with an need to be held down. easy-tearing and easy-stripping polyester Matches Sky Blue Gray Munsell liner. The product must be Sky Blue Gray 5BG7.0/0.4. and conform to Munsell Color No. Excellent weathering characteristics. 5BG7.0/0.4. The tape must be capable of AA-59163 Class-I Type-I. operating continuously at Class H temperatures (180C/356F). The tape must be compatible with all synthetic cable 2.0 Applications insulations as well as cable splicing As an overwrap for protection of compounds. terminating high-voltage cables against arcing and tracking. High-voltage cables Engineering/Architectural Specifications with these insulations should be All tape or tape-like terminations which will overwrapped: be operated either outdoors or in areas Butyl rubber subjected to contamination or moisture shall Oil-base rubber be overwrapped with at least one layer of Ethylene propylene rubber Scotch 70 Silicone Rubber Electrical Tape. P.V.C. The exposed cable insulation on the lug side Low and high-density polyethylene of assembled stress cone kits, which will be cross-linked 78-8126-0479-7-Aoperated either outdoors or in areas Dielectric Constant subjected to contamination or moisture, shall Table 2 shows the dielectric constant versus be overwrapped with at least one layer of temperature of 70 Tape. This test was run Scotch 70 Silicone Rubber Electrical Tape. according to ASTM-D-150-68 at a stress of 50 V/mil and a frequency of 60 cycles per All splices on spacer cable operating at 15 second. kV and above shall be overwrapped with Scotch 70 Silicone Rubber Electrical Tape. DIELECTRIC CONSTANT All splices on silicone rubber cables or other VS. TEMPERATURE, cables which can operate at room SCOTCH 70 TAPE temperatures in excess of 130C/266F, but TEMPERATURE DIELECTRIC not exceeding 180C/266F, shall use Scotch (C/F) CONSTANT 70 Silicone Rubber Electrical Tape as the 23/73 3.03 primary insulating material. 90/194 2.89 130/266 2.60 150/302 2.51 Table 2 5.0 Characteristics and Test Data Typical Electrical and Physical Properties 6.0 Performance Tests Physical Properties Termination Tracking Test Color Munsell 5BG7.0/0.4 Reduced-dimension terminations are Sky Blue Gray prepared according to 3M print 2047-B-16 Thickness (See Figure 1). Each specimen consists of 8 ASTM-D-1000-76 .012 in. feet of 15 kV cable and two terminations. Tensile Strength The contaminant employed in this test is the ASTM-D-1000-76 12 lbs./in. formula called out in ASTM Dust and Fog Elongation at Break Test D-2132, as shown below: ASTM-D-1000-76 450% Flint (SiO floated) 240 mesh 85 parts 2 Electrical Properties Clay 325 mesh 9 parts Dielectrical Strength ASTM-D-1000-76 875 V/mil Salt (Na Cl) technical grade 3 parts Arc Resistance Paper, filter pulp 3 parts ASTM-D-495-71 1 min. (minimum) all by weight This mixture is then ball milled using 3/4- Dissipation Factor inch diameter ceramic cylinder. The milled Table 1 shows the dissipation factor versus dust is then mixed with equal parts by temperature of 70 Tape. This test was run weight of water to make a slurry of paint according to ASTM-D-150-68 at a stress of consistency. 50 V/mil and a frequency of 60 cycles per second. Next, each termination is carefully coated in such a manner as to deposit a uniform and DISSIPATION FACTOR reproducible amount of contamination. The VS. TEMPERATURE, following procedure is used: SCOTCH 70 TAPE 1. Mix the slurry thoroughly. TEMPERATURE DISSIPATION 2. Submerge the inverted termination into (C/F) FACTOR (%) the slurry. 23/73 1.3% 3. Withdraw the termination from the 90/194 1.1% 130/266 0.5% slurry, taking care not to throw off too 150/302 0.7% much excess slurry in rotating the Table 1 termination from the inverted to an upright position. The majority of the excess slurry should drain off when the termination is upright.